./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product29.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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product29.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/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 0d12edbd4df2f08d75221f3c96b68e50e6394815b34a699d313e71ea24bf9c38 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:36:57,521 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:36:57,523 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:36:57,560 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:36:57,561 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:36:57,562 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:36:57,564 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:36:57,567 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:36:57,569 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:36:57,571 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:36:57,572 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:36:57,574 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:36:57,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:36:57,576 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:36:57,578 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:36:57,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:36:57,581 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:36:57,583 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:36:57,585 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:36:57,588 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:36:57,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:36:57,592 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:36:57,593 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:36:57,594 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:36:57,598 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:36:57,599 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:36:57,599 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:36:57,600 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:36:57,613 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:36:57,614 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:36:57,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:36:57,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:36:57,618 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:36:57,620 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:36:57,621 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:36:57,622 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:36:57,623 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:36:57,624 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:36:57,624 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:36:57,625 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:36:57,626 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:36:57,626 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:36:57,670 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:36:57,670 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:36:57,671 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:36:57,671 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:36:57,675 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:36:57,675 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:36:57,675 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:36:57,676 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:36:57,676 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:36:57,676 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:36:57,676 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:36:57,677 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:36:57,677 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:36:57,677 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:36:57,677 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:36:57,678 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:36:57,678 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:36:57,678 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:36:57,679 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:36:57,679 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:36:57,679 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:36:57,680 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:36:57,680 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:36:57,680 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:36:57,680 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:36:57,680 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:36:57,681 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:36:57,681 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:36:57,681 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:36:57,681 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:36:57,682 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:36:57,682 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:36:57,682 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:36:57,682 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:36:57,683 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:36:57,683 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:36:57,683 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:36:57,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:36:57,683 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:36:57,684 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:36:57,684 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:36:57,684 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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0d12edbd4df2f08d75221f3c96b68e50e6394815b34a699d313e71ea24bf9c38 [2021-11-25 20:36:58,020 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:36:58,056 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:36:58,058 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:36:58,060 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:36:58,061 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:36:58,062 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec3_product29.cil.c [2021-11-25 20:36:58,135 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/data/ac294a855/24f50c9f995e4f109cc15c02fcd0a331/FLAGff96eaedf [2021-11-25 20:36:58,793 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:36:58,794 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/sv-benchmarks/c/product-lines/elevator_spec3_product29.cil.c [2021-11-25 20:36:58,826 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/data/ac294a855/24f50c9f995e4f109cc15c02fcd0a331/FLAGff96eaedf [2021-11-25 20:36:59,009 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/data/ac294a855/24f50c9f995e4f109cc15c02fcd0a331 [2021-11-25 20:36:59,011 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:36:59,012 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:36:59,014 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:36:59,015 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:36:59,019 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:36:59,020 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,021 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d63acb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59, skipping insertion in model container [2021-11-25 20:36:59,021 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,032 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:36:59,119 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:36:59,571 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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/sv-benchmarks/c/product-lines/elevator_spec3_product29.cil.c[40506,40519] [2021-11-25 20:36:59,701 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:36:59,711 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:36:59,781 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_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/sv-benchmarks/c/product-lines/elevator_spec3_product29.cil.c[40506,40519] [2021-11-25 20:36:59,828 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:36:59,863 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:36:59,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59 WrapperNode [2021-11-25 20:36:59,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:36:59,865 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:36:59,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:36:59,865 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:36:59,870 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,901 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,976 INFO L137 Inliner]: procedures = 91, calls = 347, calls flagged for inlining = 26, calls inlined = 23, statements flattened = 928 [2021-11-25 20:36:59,977 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:36:59,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:36:59,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:36:59,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:36:59,987 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,995 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:36:59,996 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:37:00,038 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:37:00,072 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:37:00,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:37:00,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:37:00,086 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:37:00,086 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:37:00,086 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:37:00,090 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (1/1) ... [2021-11-25 20:37:00,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:37:00,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:00,134 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:37:00,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:37:00,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:37:00,195 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-25 20:37:00,195 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-25 20:37:00,196 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 20:37:00,196 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 20:37:00,196 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 20:37:00,196 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 20:37:00,196 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 20:37:00,197 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 20:37:00,197 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 20:37:00,197 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 20:37:00,197 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 20:37:00,197 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 20:37:00,197 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 20:37:00,198 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 20:37:00,198 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 20:37:00,198 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 20:37:00,198 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 20:37:00,198 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 20:37:00,199 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 20:37:00,199 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 20:37:00,199 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 20:37:00,199 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 20:37:00,199 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 20:37:00,199 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 20:37:00,200 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 20:37:00,200 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 20:37:00,200 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 20:37:00,200 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 20:37:00,200 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-25 20:37:00,201 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-25 20:37:00,201 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 20:37:00,201 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 20:37:00,201 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 20:37:00,201 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 20:37:00,201 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-25 20:37:00,202 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-25 20:37:00,202 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 20:37:00,202 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 20:37:00,202 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 20:37:00,202 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 20:37:00,203 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 20:37:00,203 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 20:37:00,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:37:00,204 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 20:37:00,204 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 20:37:00,205 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 20:37:00,206 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 20:37:00,206 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 20:37:00,207 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 20:37:00,207 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 20:37:00,208 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 20:37:00,208 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:37:00,208 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:37:00,209 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 20:37:00,209 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 20:37:00,379 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:37:00,382 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:37:01,475 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:37:02,118 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:37:02,119 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:37:02,124 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:37:02 BoogieIcfgContainer [2021-11-25 20:37:02,124 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:37:02,127 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:37:02,127 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:37:02,131 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:37:02,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:36:59" (1/3) ... [2021-11-25 20:37:02,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b9467c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:37:02, skipping insertion in model container [2021-11-25 20:37:02,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:59" (2/3) ... [2021-11-25 20:37:02,133 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b9467c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:37:02, skipping insertion in model container [2021-11-25 20:37:02,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:37:02" (3/3) ... [2021-11-25 20:37:02,135 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product29.cil.c [2021-11-25 20:37:02,141 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:37:02,141 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:37:02,215 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:37:02,225 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:37:02,226 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:37:02,279 INFO L276 IsEmpty]: Start isEmpty. Operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) [2021-11-25 20:37:02,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 20:37:02,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:02,316 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:02,317 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:02,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:02,325 INFO L85 PathProgramCache]: Analyzing trace with hash -414763503, now seen corresponding path program 1 times [2021-11-25 20:37:02,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:02,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521846851] [2021-11-25 20:37:02,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:02,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:02,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:03,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:37:03,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:03,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521846851] [2021-11-25 20:37:03,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521846851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:03,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:03,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:37:03,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231325175] [2021-11-25 20:37:03,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:03,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:03,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:03,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:03,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:37:03,052 INFO L87 Difference]: Start difference. First operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) Second operand has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 20:37:04,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:04,250 INFO L93 Difference]: Finished difference Result 1150 states and 1839 transitions. [2021-11-25 20:37:04,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:37:04,254 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2021-11-25 20:37:04,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:04,285 INFO L225 Difference]: With dead ends: 1150 [2021-11-25 20:37:04,286 INFO L226 Difference]: Without dead ends: 748 [2021-11-25 20:37:04,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:37:04,308 INFO L933 BasicCegarLoop]: 654 mSDtfsCounter, 545 mSDsluCounter, 2489 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 2990 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:04,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 2990 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:37:04,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-11-25 20:37:04,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 740. [2021-11-25 20:37:04,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 740 states, 497 states have (on average 1.5010060362173039) internal successors, (746), 527 states have internal predecessors, (746), 196 states have call successors, (196), 49 states have call predecessors, (196), 46 states have return successors, (197), 188 states have call predecessors, (197), 192 states have call successors, (197) [2021-11-25 20:37:04,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 740 states to 740 states and 1139 transitions. [2021-11-25 20:37:04,481 INFO L78 Accepts]: Start accepts. Automaton has 740 states and 1139 transitions. Word has length 75 [2021-11-25 20:37:04,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:04,482 INFO L470 AbstractCegarLoop]: Abstraction has 740 states and 1139 transitions. [2021-11-25 20:37:04,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 20:37:04,483 INFO L276 IsEmpty]: Start isEmpty. Operand 740 states and 1139 transitions. [2021-11-25 20:37:04,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 20:37:04,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:04,490 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 20:37:04,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:37:04,491 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:04,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:04,492 INFO L85 PathProgramCache]: Analyzing trace with hash -415147964, now seen corresponding path program 1 times [2021-11-25 20:37:04,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:04,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335855856] [2021-11-25 20:37:04,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:04,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:04,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:04,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:37:04,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:04,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335855856] [2021-11-25 20:37:04,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335855856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:04,745 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:04,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:37:04,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198222872] [2021-11-25 20:37:04,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:04,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:04,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:04,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:04,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:37:04,750 INFO L87 Difference]: Start difference. First operand 740 states and 1139 transitions. Second operand has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 20:37:05,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:05,843 INFO L93 Difference]: Finished difference Result 2669 states and 4283 transitions. [2021-11-25 20:37:05,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:37:05,845 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) Word has length 80 [2021-11-25 20:37:05,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:05,865 INFO L225 Difference]: With dead ends: 2669 [2021-11-25 20:37:05,866 INFO L226 Difference]: Without dead ends: 1941 [2021-11-25 20:37:05,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:37:05,876 INFO L933 BasicCegarLoop]: 921 mSDtfsCounter, 847 mSDsluCounter, 3245 mSDsCounter, 0 mSdLazyCounter, 740 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 919 SdHoareTripleChecker+Valid, 4029 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 740 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:05,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [919 Valid, 4029 Invalid, 838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 740 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:37:05,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1941 states. [2021-11-25 20:37:06,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1941 to 1387. [2021-11-25 20:37:06,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1387 states, 949 states have (on average 1.5047418335089568) internal successors, (1428), 1007 states have internal predecessors, (1428), 351 states have call successors, (351), 91 states have call predecessors, (351), 86 states have return successors, (380), 326 states have call predecessors, (380), 345 states have call successors, (380) [2021-11-25 20:37:06,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1387 states to 1387 states and 2159 transitions. [2021-11-25 20:37:06,054 INFO L78 Accepts]: Start accepts. Automaton has 1387 states and 2159 transitions. Word has length 80 [2021-11-25 20:37:06,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:06,054 INFO L470 AbstractCegarLoop]: Abstraction has 1387 states and 2159 transitions. [2021-11-25 20:37:06,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 20:37:06,055 INFO L276 IsEmpty]: Start isEmpty. Operand 1387 states and 2159 transitions. [2021-11-25 20:37:06,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 20:37:06,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:06,059 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 20:37:06,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:37:06,060 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:06,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:06,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1728178894, now seen corresponding path program 1 times [2021-11-25 20:37:06,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:06,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759025011] [2021-11-25 20:37:06,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:06,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:06,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:37:06,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:06,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759025011] [2021-11-25 20:37:06,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759025011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:06,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381173985] [2021-11-25 20:37:06,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:06,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:06,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:06,186 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:06,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:37:06,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:06,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 1581 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:37:06,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:06,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:37:06,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:06,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381173985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:06,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:06,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:37:06,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994409957] [2021-11-25 20:37:06,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:06,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:37:06,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:06,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:37:06,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:37:06,792 INFO L87 Difference]: Start difference. First operand 1387 states and 2159 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:37:07,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:07,137 INFO L93 Difference]: Finished difference Result 3959 states and 6319 transitions. [2021-11-25 20:37:07,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:37:07,138 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 79 [2021-11-25 20:37:07,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:07,173 INFO L225 Difference]: With dead ends: 3959 [2021-11-25 20:37:07,173 INFO L226 Difference]: Without dead ends: 2584 [2021-11-25 20:37:07,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:37:07,194 INFO L933 BasicCegarLoop]: 674 mSDtfsCounter, 562 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1173 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:07,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 1173 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:07,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2584 states. [2021-11-25 20:37:07,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2584 to 2509. [2021-11-25 20:37:07,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2509 states, 1727 states have (on average 1.5176606832657789) internal successors, (2621), 1843 states have internal predecessors, (2621), 620 states have call successors, (620), 162 states have call predecessors, (620), 161 states have return successors, (700), 579 states have call predecessors, (700), 614 states have call successors, (700) [2021-11-25 20:37:07,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 3941 transitions. [2021-11-25 20:37:07,414 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 3941 transitions. Word has length 79 [2021-11-25 20:37:07,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:07,416 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 3941 transitions. [2021-11-25 20:37:07,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:37:07,416 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 3941 transitions. [2021-11-25 20:37:07,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 20:37:07,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:07,423 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:07,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:07,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:07,649 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:07,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:07,650 INFO L85 PathProgramCache]: Analyzing trace with hash -1342972250, now seen corresponding path program 1 times [2021-11-25 20:37:07,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:07,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620571384] [2021-11-25 20:37:07,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:07,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:07,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:07,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:37:07,853 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:07,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620571384] [2021-11-25 20:37:07,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620571384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:07,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75068069] [2021-11-25 20:37:07,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:07,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:07,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:07,861 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:07,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:37:08,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:08,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 1582 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:37:08,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:08,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:37:08,385 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:08,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75068069] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:08,386 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:08,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:37:08,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530853443] [2021-11-25 20:37:08,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:08,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:37:08,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:08,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:37:08,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:37:08,388 INFO L87 Difference]: Start difference. First operand 2509 states and 3941 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:37:08,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:08,680 INFO L93 Difference]: Finished difference Result 5622 states and 8926 transitions. [2021-11-25 20:37:08,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:37:08,681 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 81 [2021-11-25 20:37:08,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:08,712 INFO L225 Difference]: With dead ends: 5622 [2021-11-25 20:37:08,713 INFO L226 Difference]: Without dead ends: 3125 [2021-11-25 20:37:08,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:37:08,736 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 559 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 1176 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:08,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 1176 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:08,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3125 states. [2021-11-25 20:37:08,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3125 to 3082. [2021-11-25 20:37:08,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3082 states, 2129 states have (on average 1.5274776890558948) internal successors, (3252), 2274 states have internal predecessors, (3252), 755 states have call successors, (755), 196 states have call predecessors, (755), 197 states have return successors, (854), 707 states have call predecessors, (854), 749 states have call successors, (854) [2021-11-25 20:37:08,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3082 states to 3082 states and 4861 transitions. [2021-11-25 20:37:08,939 INFO L78 Accepts]: Start accepts. Automaton has 3082 states and 4861 transitions. Word has length 81 [2021-11-25 20:37:08,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:08,939 INFO L470 AbstractCegarLoop]: Abstraction has 3082 states and 4861 transitions. [2021-11-25 20:37:08,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:37:08,940 INFO L276 IsEmpty]: Start isEmpty. Operand 3082 states and 4861 transitions. [2021-11-25 20:37:08,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 20:37:08,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:08,944 INFO L514 BasicCegarLoop]: trace histogram [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 20:37:08,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:09,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:09,169 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:09,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:09,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1934255269, now seen corresponding path program 1 times [2021-11-25 20:37:09,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:09,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702347404] [2021-11-25 20:37:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:09,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:09,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:09,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:37:09,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:09,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702347404] [2021-11-25 20:37:09,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702347404] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:09,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085558496] [2021-11-25 20:37:09,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:09,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:09,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:09,389 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:09,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:37:09,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:09,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:37:09,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:09,949 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:37:09,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:09,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085558496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:09,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:09,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-25 20:37:09,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84384763] [2021-11-25 20:37:09,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:09,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:37:09,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:09,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:37:09,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:37:09,952 INFO L87 Difference]: Start difference. First operand 3082 states and 4861 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 20:37:10,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:10,460 INFO L93 Difference]: Finished difference Result 6167 states and 9944 transitions. [2021-11-25 20:37:10,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:37:10,461 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 87 [2021-11-25 20:37:10,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:10,499 INFO L225 Difference]: With dead ends: 6167 [2021-11-25 20:37:10,499 INFO L226 Difference]: Without dead ends: 3902 [2021-11-25 20:37:10,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:10,524 INFO L933 BasicCegarLoop]: 650 mSDtfsCounter, 210 mSDsluCounter, 1889 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 2430 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:10,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 2430 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:10,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3902 states. [2021-11-25 20:37:10,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3902 to 3286. [2021-11-25 20:37:10,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3286 states, 2271 states have (on average 1.520035226772347) internal successors, (3452), 2437 states have internal predecessors, (3452), 814 states have call successors, (814), 196 states have call predecessors, (814), 200 states have return successors, (925), 766 states have call predecessors, (925), 808 states have call successors, (925) [2021-11-25 20:37:10,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3286 states to 3286 states and 5191 transitions. [2021-11-25 20:37:10,814 INFO L78 Accepts]: Start accepts. Automaton has 3286 states and 5191 transitions. Word has length 87 [2021-11-25 20:37:10,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:10,815 INFO L470 AbstractCegarLoop]: Abstraction has 3286 states and 5191 transitions. [2021-11-25 20:37:10,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 20:37:10,815 INFO L276 IsEmpty]: Start isEmpty. Operand 3286 states and 5191 transitions. [2021-11-25 20:37:10,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-25 20:37:10,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:10,825 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:10,869 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:11,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:11,053 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:11,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:11,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1975805511, now seen corresponding path program 1 times [2021-11-25 20:37:11,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:11,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696391033] [2021-11-25 20:37:11,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:11,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:11,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:11,240 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:37:11,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:11,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696391033] [2021-11-25 20:37:11,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696391033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:11,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724890434] [2021-11-25 20:37:11,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:11,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:11,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:11,245 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:11,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:37:11,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:11,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 1614 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:37:11,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:11,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:11,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:11,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724890434] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:11,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:11,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 20:37:11,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081209447] [2021-11-25 20:37:11,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:11,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:37:11,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:11,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:37:11,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:11,877 INFO L87 Difference]: Start difference. First operand 3286 states and 5191 transitions. Second operand has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 7 states have internal predecessors, (52), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-25 20:37:12,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:12,897 INFO L93 Difference]: Finished difference Result 5778 states and 9149 transitions. [2021-11-25 20:37:12,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:37:12,900 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 7 states have internal predecessors, (52), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 89 [2021-11-25 20:37:12,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:12,932 INFO L225 Difference]: With dead ends: 5778 [2021-11-25 20:37:12,933 INFO L226 Difference]: Without dead ends: 3325 [2021-11-25 20:37:12,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-25 20:37:12,955 INFO L933 BasicCegarLoop]: 721 mSDtfsCounter, 519 mSDsluCounter, 1777 mSDsCounter, 0 mSdLazyCounter, 919 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 2356 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 919 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:12,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 2356 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 919 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:37:12,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3325 states. [2021-11-25 20:37:13,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3325 to 3322. [2021-11-25 20:37:13,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3322 states, 2295 states have (on average 1.5145969498910676) internal successors, (3476), 2457 states have internal predecessors, (3476), 814 states have call successors, (814), 200 states have call predecessors, (814), 212 states have return successors, (941), 778 states have call predecessors, (941), 808 states have call successors, (941) [2021-11-25 20:37:13,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3322 states to 3322 states and 5231 transitions. [2021-11-25 20:37:13,208 INFO L78 Accepts]: Start accepts. Automaton has 3322 states and 5231 transitions. Word has length 89 [2021-11-25 20:37:13,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:13,209 INFO L470 AbstractCegarLoop]: Abstraction has 3322 states and 5231 transitions. [2021-11-25 20:37:13,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 7 states have internal predecessors, (52), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-25 20:37:13,209 INFO L276 IsEmpty]: Start isEmpty. Operand 3322 states and 5231 transitions. [2021-11-25 20:37:13,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 20:37:13,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:13,215 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:13,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:13,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:13,429 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:13,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:13,430 INFO L85 PathProgramCache]: Analyzing trace with hash -141184640, now seen corresponding path program 1 times [2021-11-25 20:37:13,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:13,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744506326] [2021-11-25 20:37:13,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:13,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:13,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:13,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:37:13,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:13,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744506326] [2021-11-25 20:37:13,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744506326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:13,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020862412] [2021-11-25 20:37:13,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:13,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:13,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:13,650 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:13,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:37:13,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:13,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 1614 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:37:13,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:14,372 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:14,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:14,731 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:37:14,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020862412] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:14,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:37:14,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2021-11-25 20:37:14,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826572079] [2021-11-25 20:37:14,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:14,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:37:14,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:14,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:37:14,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:37:14,733 INFO L87 Difference]: Start difference. First operand 3322 states and 5231 transitions. Second operand has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 20:37:18,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:18,478 INFO L93 Difference]: Finished difference Result 8634 states and 14349 transitions. [2021-11-25 20:37:18,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:37:18,479 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 92 [2021-11-25 20:37:18,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:18,545 INFO L225 Difference]: With dead ends: 8634 [2021-11-25 20:37:18,545 INFO L226 Difference]: Without dead ends: 6545 [2021-11-25 20:37:18,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:37:18,573 INFO L933 BasicCegarLoop]: 741 mSDtfsCounter, 2583 mSDsluCounter, 2616 mSDsCounter, 0 mSdLazyCounter, 2604 mSolverCounterSat, 1248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2670 SdHoareTripleChecker+Valid, 3200 SdHoareTripleChecker+Invalid, 3852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1248 IncrementalHoareTripleChecker+Valid, 2604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:18,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2670 Valid, 3200 Invalid, 3852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1248 Valid, 2604 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-25 20:37:18,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6545 states. [2021-11-25 20:37:19,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6545 to 6050. [2021-11-25 20:37:19,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6050 states, 4287 states have (on average 1.5264753907161186) internal successors, (6544), 4523 states have internal predecessors, (6544), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 417 states have return successors, (1858), 1292 states have call predecessors, (1858), 1337 states have call successors, (1858) [2021-11-25 20:37:19,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6050 states to 6050 states and 9747 transitions. [2021-11-25 20:37:19,100 INFO L78 Accepts]: Start accepts. Automaton has 6050 states and 9747 transitions. Word has length 92 [2021-11-25 20:37:19,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:19,100 INFO L470 AbstractCegarLoop]: Abstraction has 6050 states and 9747 transitions. [2021-11-25 20:37:19,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 20:37:19,101 INFO L276 IsEmpty]: Start isEmpty. Operand 6050 states and 9747 transitions. [2021-11-25 20:37:19,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 20:37:19,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:19,105 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:19,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:19,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:19,329 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:19,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:19,330 INFO L85 PathProgramCache]: Analyzing trace with hash 756901966, now seen corresponding path program 1 times [2021-11-25 20:37:19,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:19,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456424641] [2021-11-25 20:37:19,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:19,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:19,486 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:37:19,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:19,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456424641] [2021-11-25 20:37:19,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456424641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:19,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326151273] [2021-11-25 20:37:19,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:19,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:19,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:19,488 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:19,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:37:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:19,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:37:19,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:20,065 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:20,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:20,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326151273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:20,066 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:20,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-25 20:37:20,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897031768] [2021-11-25 20:37:20,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:20,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:37:20,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:20,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:37:20,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:37:20,069 INFO L87 Difference]: Start difference. First operand 6050 states and 9747 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 20:37:20,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:20,977 INFO L93 Difference]: Finished difference Result 10883 states and 17626 transitions. [2021-11-25 20:37:20,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:37:20,978 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) Word has length 96 [2021-11-25 20:37:20,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:21,031 INFO L225 Difference]: With dead ends: 10883 [2021-11-25 20:37:21,031 INFO L226 Difference]: Without dead ends: 6066 [2021-11-25 20:37:21,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:21,062 INFO L933 BasicCegarLoop]: 738 mSDtfsCounter, 419 mSDsluCounter, 1981 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 2610 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:21,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [419 Valid, 2610 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:37:21,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6066 states. [2021-11-25 20:37:21,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6066 to 6050. [2021-11-25 20:37:21,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6050 states, 4287 states have (on average 1.5264753907161186) internal successors, (6544), 4523 states have internal predecessors, (6544), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 417 states have return successors, (1850), 1292 states have call predecessors, (1850), 1337 states have call successors, (1850) [2021-11-25 20:37:21,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6050 states to 6050 states and 9739 transitions. [2021-11-25 20:37:21,465 INFO L78 Accepts]: Start accepts. Automaton has 6050 states and 9739 transitions. Word has length 96 [2021-11-25 20:37:21,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:21,466 INFO L470 AbstractCegarLoop]: Abstraction has 6050 states and 9739 transitions. [2021-11-25 20:37:21,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 20:37:21,467 INFO L276 IsEmpty]: Start isEmpty. Operand 6050 states and 9739 transitions. [2021-11-25 20:37:21,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 20:37:21,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:21,474 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:21,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:21,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:37:21,701 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:21,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:21,702 INFO L85 PathProgramCache]: Analyzing trace with hash 31459966, now seen corresponding path program 1 times [2021-11-25 20:37:21,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:21,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513695531] [2021-11-25 20:37:21,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:21,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:21,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:21,882 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:37:21,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:21,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513695531] [2021-11-25 20:37:21,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513695531] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:21,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405060398] [2021-11-25 20:37:21,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:21,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:21,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:21,885 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:21,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:37:22,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:22,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 1739 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:37:22,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:22,514 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:37:22,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:22,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405060398] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:22,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:22,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 20:37:22,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362020948] [2021-11-25 20:37:22,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:22,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:37:22,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:22,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:37:22,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:22,521 INFO L87 Difference]: Start difference. First operand 6050 states and 9739 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:23,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:23,026 INFO L93 Difference]: Finished difference Result 11579 states and 19108 transitions. [2021-11-25 20:37:23,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:37:23,027 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 124 [2021-11-25 20:37:23,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:23,076 INFO L225 Difference]: With dead ends: 11579 [2021-11-25 20:37:23,076 INFO L226 Difference]: Without dead ends: 6374 [2021-11-25 20:37:23,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:23,109 INFO L933 BasicCegarLoop]: 610 mSDtfsCounter, 13 mSDsluCounter, 3192 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3619 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:23,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3619 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:23,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6374 states. [2021-11-25 20:37:23,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6374 to 6222. [2021-11-25 20:37:23,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6222 states, 4403 states have (on average 1.5126050420168067) internal successors, (6660), 4651 states have internal predecessors, (6660), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1336 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 20:37:23,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6222 states to 6222 states and 10182 transitions. [2021-11-25 20:37:23,610 INFO L78 Accepts]: Start accepts. Automaton has 6222 states and 10182 transitions. Word has length 124 [2021-11-25 20:37:23,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:23,610 INFO L470 AbstractCegarLoop]: Abstraction has 6222 states and 10182 transitions. [2021-11-25 20:37:23,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:23,611 INFO L276 IsEmpty]: Start isEmpty. Operand 6222 states and 10182 transitions. [2021-11-25 20:37:23,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 20:37:23,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:23,617 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:23,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:23,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:23,841 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:23,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:23,842 INFO L85 PathProgramCache]: Analyzing trace with hash -132933723, now seen corresponding path program 1 times [2021-11-25 20:37:23,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:23,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323969268] [2021-11-25 20:37:23,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:23,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:23,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:24,022 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 20:37:24,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:24,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323969268] [2021-11-25 20:37:24,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323969268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:24,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019195016] [2021-11-25 20:37:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:24,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:24,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:24,024 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:24,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:37:24,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:24,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:37:24,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:24,621 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:24,621 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:24,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019195016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:24,621 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:24,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 20:37:24,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536923289] [2021-11-25 20:37:24,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:24,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:37:24,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:24,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:37:24,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:24,624 INFO L87 Difference]: Start difference. First operand 6222 states and 10182 transitions. Second operand has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:25,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:25,221 INFO L93 Difference]: Finished difference Result 11859 states and 19745 transitions. [2021-11-25 20:37:25,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:37:25,221 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 122 [2021-11-25 20:37:25,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:25,280 INFO L225 Difference]: With dead ends: 11859 [2021-11-25 20:37:25,281 INFO L226 Difference]: Without dead ends: 6490 [2021-11-25 20:37:25,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:25,315 INFO L933 BasicCegarLoop]: 612 mSDtfsCounter, 13 mSDsluCounter, 3200 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3629 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:25,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3629 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:37:25,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6490 states. [2021-11-25 20:37:25,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6490 to 6250. [2021-11-25 20:37:25,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6250 states, 4431 states have (on average 1.5093658316407133) internal successors, (6688), 4651 states have internal predecessors, (6688), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1364 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 20:37:25,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6250 states to 6250 states and 10210 transitions. [2021-11-25 20:37:25,720 INFO L78 Accepts]: Start accepts. Automaton has 6250 states and 10210 transitions. Word has length 122 [2021-11-25 20:37:25,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:25,721 INFO L470 AbstractCegarLoop]: Abstraction has 6250 states and 10210 transitions. [2021-11-25 20:37:25,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:25,722 INFO L276 IsEmpty]: Start isEmpty. Operand 6250 states and 10210 transitions. [2021-11-25 20:37:25,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 20:37:25,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:25,728 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:25,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:25,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:37:25,945 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:25,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:25,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1852437694, now seen corresponding path program 1 times [2021-11-25 20:37:25,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:25,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983399193] [2021-11-25 20:37:25,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:25,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:25,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:26,154 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:37:26,155 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:26,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983399193] [2021-11-25 20:37:26,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983399193] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:26,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287241759] [2021-11-25 20:37:26,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:26,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:26,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:26,157 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:26,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:37:26,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:26,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:37:26,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:26,799 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:37:26,799 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:26,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287241759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:26,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:26,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 20:37:26,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107135599] [2021-11-25 20:37:26,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:26,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:37:26,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:26,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:37:26,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:26,802 INFO L87 Difference]: Start difference. First operand 6250 states and 10210 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:27,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:27,349 INFO L93 Difference]: Finished difference Result 11915 states and 19801 transitions. [2021-11-25 20:37:27,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:37:27,349 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 125 [2021-11-25 20:37:27,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:27,405 INFO L225 Difference]: With dead ends: 11915 [2021-11-25 20:37:27,406 INFO L226 Difference]: Without dead ends: 6518 [2021-11-25 20:37:27,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:37:27,447 INFO L933 BasicCegarLoop]: 612 mSDtfsCounter, 13 mSDsluCounter, 3206 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3631 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:27,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3631 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:27,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6518 states. [2021-11-25 20:37:27,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6518 to 6278. [2021-11-25 20:37:27,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6278 states, 4459 states have (on average 1.5061673020856694) internal successors, (6716), 4651 states have internal predecessors, (6716), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1392 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 20:37:27,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6278 states to 6278 states and 10238 transitions. [2021-11-25 20:37:27,839 INFO L78 Accepts]: Start accepts. Automaton has 6278 states and 10238 transitions. Word has length 125 [2021-11-25 20:37:27,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:27,840 INFO L470 AbstractCegarLoop]: Abstraction has 6278 states and 10238 transitions. [2021-11-25 20:37:27,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 20:37:27,840 INFO L276 IsEmpty]: Start isEmpty. Operand 6278 states and 10238 transitions. [2021-11-25 20:37:27,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 20:37:27,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:27,852 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:27,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:28,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:37:28,061 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:28,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:28,061 INFO L85 PathProgramCache]: Analyzing trace with hash -501436400, now seen corresponding path program 1 times [2021-11-25 20:37:28,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:28,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079374048] [2021-11-25 20:37:28,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:28,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:28,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:28,212 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:37:28,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:28,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079374048] [2021-11-25 20:37:28,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079374048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:28,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47190589] [2021-11-25 20:37:28,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:28,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:28,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:28,214 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:28,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:37:28,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:28,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 1746 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:37:28,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:28,773 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:28,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:28,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47190589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:28,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:28,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-25 20:37:28,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921353922] [2021-11-25 20:37:28,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:28,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:28,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:28,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:28,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:37:28,775 INFO L87 Difference]: Start difference. First operand 6278 states and 10238 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 20:37:29,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:29,384 INFO L93 Difference]: Finished difference Result 12963 states and 21778 transitions. [2021-11-25 20:37:29,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:37:29,385 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 132 [2021-11-25 20:37:29,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:29,434 INFO L225 Difference]: With dead ends: 12963 [2021-11-25 20:37:29,435 INFO L226 Difference]: Without dead ends: 6030 [2021-11-25 20:37:29,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:37:29,480 INFO L933 BasicCegarLoop]: 634 mSDtfsCounter, 247 mSDsluCounter, 2398 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 2894 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:29,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 2894 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:29,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6030 states. [2021-11-25 20:37:29,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6030 to 6030. [2021-11-25 20:37:29,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6030 states, 4260 states have (on average 1.4774647887323944) internal successors, (6294), 4452 states have internal predecessors, (6294), 1312 states have call successors, (1312), 372 states have call predecessors, (1312), 457 states have return successors, (2112), 1349 states have call predecessors, (2112), 1304 states have call successors, (2112) [2021-11-25 20:37:29,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6030 states to 6030 states and 9718 transitions. [2021-11-25 20:37:29,839 INFO L78 Accepts]: Start accepts. Automaton has 6030 states and 9718 transitions. Word has length 132 [2021-11-25 20:37:29,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:29,842 INFO L470 AbstractCegarLoop]: Abstraction has 6030 states and 9718 transitions. [2021-11-25 20:37:29,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 20:37:29,842 INFO L276 IsEmpty]: Start isEmpty. Operand 6030 states and 9718 transitions. [2021-11-25 20:37:29,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-25 20:37:29,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:29,854 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:29,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:30,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:37:30,069 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:30,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:30,069 INFO L85 PathProgramCache]: Analyzing trace with hash 947478370, now seen corresponding path program 1 times [2021-11-25 20:37:30,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:30,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58459106] [2021-11-25 20:37:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:30,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:30,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:30,237 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:37:30,238 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:30,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58459106] [2021-11-25 20:37:30,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58459106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:30,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099497050] [2021-11-25 20:37:30,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:30,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:30,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:30,240 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:30,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:37:30,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:30,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 1759 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:37:30,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:30,838 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:37:30,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:30,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099497050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:30,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:30,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-25 20:37:30,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897627254] [2021-11-25 20:37:30,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:30,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:30,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:30,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:30,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:37:30,840 INFO L87 Difference]: Start difference. First operand 6030 states and 9718 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (22), 2 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 20:37:31,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:31,395 INFO L93 Difference]: Finished difference Result 13038 states and 21458 transitions. [2021-11-25 20:37:31,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:37:31,396 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (22), 2 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 154 [2021-11-25 20:37:31,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:31,454 INFO L225 Difference]: With dead ends: 13038 [2021-11-25 20:37:31,455 INFO L226 Difference]: Without dead ends: 7677 [2021-11-25 20:37:31,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:37:31,498 INFO L933 BasicCegarLoop]: 612 mSDtfsCounter, 298 mSDsluCounter, 2346 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 2812 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:31,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 2812 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:31,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7677 states. [2021-11-25 20:37:31,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7677 to 7677. [2021-11-25 20:37:31,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7677 states, 5668 states have (on average 1.5047635850388144) internal successors, (8529), 5891 states have internal predecessors, (8529), 1492 states have call successors, (1492), 400 states have call predecessors, (1492), 516 states have return successors, (2292), 1529 states have call predecessors, (2292), 1484 states have call successors, (2292) [2021-11-25 20:37:32,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7677 states to 7677 states and 12313 transitions. [2021-11-25 20:37:32,040 INFO L78 Accepts]: Start accepts. Automaton has 7677 states and 12313 transitions. Word has length 154 [2021-11-25 20:37:32,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:32,041 INFO L470 AbstractCegarLoop]: Abstraction has 7677 states and 12313 transitions. [2021-11-25 20:37:32,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (22), 2 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 20:37:32,041 INFO L276 IsEmpty]: Start isEmpty. Operand 7677 states and 12313 transitions. [2021-11-25 20:37:32,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 20:37:32,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:32,054 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:32,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:32,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:32,273 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:32,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:32,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1435047321, now seen corresponding path program 1 times [2021-11-25 20:37:32,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:32,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748629564] [2021-11-25 20:37:32,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:32,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:32,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:32,477 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 20:37:32,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:32,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748629564] [2021-11-25 20:37:32,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748629564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:32,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772197552] [2021-11-25 20:37:32,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:32,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:32,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:32,480 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:32,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:37:32,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:32,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 1749 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:37:32,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:33,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:33,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772197552] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:33,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:33,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 16 [2021-11-25 20:37:33,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279984241] [2021-11-25 20:37:33,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:33,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:37:33,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:33,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:37:33,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:37:33,564 INFO L87 Difference]: Start difference. First operand 7677 states and 12313 transitions. Second operand has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:37:38,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:38,331 INFO L93 Difference]: Finished difference Result 31275 states and 52296 transitions. [2021-11-25 20:37:38,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:37:38,332 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) Word has length 140 [2021-11-25 20:37:38,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:38,487 INFO L225 Difference]: With dead ends: 31275 [2021-11-25 20:37:38,488 INFO L226 Difference]: Without dead ends: 23870 [2021-11-25 20:37:38,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:37:38,554 INFO L933 BasicCegarLoop]: 2525 mSDtfsCounter, 2907 mSDsluCounter, 6162 mSDsCounter, 0 mSdLazyCounter, 3613 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2921 SdHoareTripleChecker+Valid, 8337 SdHoareTripleChecker+Invalid, 3776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 3613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:38,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2921 Valid, 8337 Invalid, 3776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 3613 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-25 20:37:38,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23870 states. [2021-11-25 20:37:39,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23870 to 20148. [2021-11-25 20:37:39,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20148 states, 15183 states have (on average 1.4774418757821248) internal successors, (22432), 15603 states have internal predecessors, (22432), 3529 states have call successors, (3529), 1080 states have call predecessors, (3529), 1435 states have return successors, (7127), 3656 states have call predecessors, (7127), 3511 states have call successors, (7127) [2021-11-25 20:37:39,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20148 states to 20148 states and 33088 transitions. [2021-11-25 20:37:39,933 INFO L78 Accepts]: Start accepts. Automaton has 20148 states and 33088 transitions. Word has length 140 [2021-11-25 20:37:39,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:39,934 INFO L470 AbstractCegarLoop]: Abstraction has 20148 states and 33088 transitions. [2021-11-25 20:37:39,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:37:39,934 INFO L276 IsEmpty]: Start isEmpty. Operand 20148 states and 33088 transitions. [2021-11-25 20:37:39,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 20:37:39,971 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:39,971 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:40,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:40,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:37:40,197 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:40,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:40,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1051233269, now seen corresponding path program 1 times [2021-11-25 20:37:40,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:40,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281754910] [2021-11-25 20:37:40,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:40,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:40,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:40,334 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:37:40,334 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:40,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281754910] [2021-11-25 20:37:40,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281754910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:40,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708978823] [2021-11-25 20:37:40,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:40,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:40,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:40,336 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:40,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:37:40,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:40,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 1972 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:37:40,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:40,867 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:37:40,867 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:40,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708978823] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:40,868 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:40,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 20:37:40,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773119895] [2021-11-25 20:37:40,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:40,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:37:40,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:40,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:37:40,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:37:40,871 INFO L87 Difference]: Start difference. First operand 20148 states and 33088 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 20:37:42,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:42,142 INFO L93 Difference]: Finished difference Result 40221 states and 68808 transitions. [2021-11-25 20:37:42,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:37:42,142 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 138 [2021-11-25 20:37:42,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:42,323 INFO L225 Difference]: With dead ends: 40221 [2021-11-25 20:37:42,323 INFO L226 Difference]: Without dead ends: 22533 [2021-11-25 20:37:42,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:37:42,690 INFO L933 BasicCegarLoop]: 767 mSDtfsCounter, 105 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 1372 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:42,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 1372 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:42,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22533 states. [2021-11-25 20:37:44,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22533 to 20344. [2021-11-25 20:37:44,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20344 states, 15351 states have (on average 1.4740407791023387) internal successors, (22628), 15771 states have internal predecessors, (22628), 3557 states have call successors, (3557), 1080 states have call predecessors, (3557), 1435 states have return successors, (7155), 3684 states have call predecessors, (7155), 3539 states have call successors, (7155) [2021-11-25 20:37:44,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20344 states to 20344 states and 33340 transitions. [2021-11-25 20:37:44,341 INFO L78 Accepts]: Start accepts. Automaton has 20344 states and 33340 transitions. Word has length 138 [2021-11-25 20:37:44,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:44,342 INFO L470 AbstractCegarLoop]: Abstraction has 20344 states and 33340 transitions. [2021-11-25 20:37:44,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 20:37:44,343 INFO L276 IsEmpty]: Start isEmpty. Operand 20344 states and 33340 transitions. [2021-11-25 20:37:44,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 20:37:44,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:44,391 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:44,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:44,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:37:44,617 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:44,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:44,618 INFO L85 PathProgramCache]: Analyzing trace with hash 2111428664, now seen corresponding path program 1 times [2021-11-25 20:37:44,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:44,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560493160] [2021-11-25 20:37:44,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:44,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:44,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:44,751 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:37:44,751 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:44,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560493160] [2021-11-25 20:37:44,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560493160] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:44,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981786667] [2021-11-25 20:37:44,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:44,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:44,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:44,753 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:44,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:37:45,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:45,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 1973 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:37:45,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:45,354 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:37:45,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:45,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981786667] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:45,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:45,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-25 20:37:45,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280139873] [2021-11-25 20:37:45,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:45,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:37:45,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:45,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:37:45,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:37:45,357 INFO L87 Difference]: Start difference. First operand 20344 states and 33340 transitions. Second operand has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) [2021-11-25 20:37:49,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:49,855 INFO L93 Difference]: Finished difference Result 43553 states and 72728 transitions. [2021-11-25 20:37:49,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:37:49,856 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) Word has length 138 [2021-11-25 20:37:49,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:50,082 INFO L225 Difference]: With dead ends: 43553 [2021-11-25 20:37:50,082 INFO L226 Difference]: Without dead ends: 22778 [2021-11-25 20:37:50,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:37:50,228 INFO L933 BasicCegarLoop]: 669 mSDtfsCounter, 1725 mSDsluCounter, 1468 mSDsCounter, 0 mSdLazyCounter, 3532 mSolverCounterSat, 1132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1761 SdHoareTripleChecker+Valid, 1998 SdHoareTripleChecker+Invalid, 4664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1132 IncrementalHoareTripleChecker+Valid, 3532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:50,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1761 Valid, 1998 Invalid, 4664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1132 Valid, 3532 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 20:37:50,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22778 states. [2021-11-25 20:37:52,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22778 to 20324. [2021-11-25 20:37:52,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20324 states, 15331 states have (on average 1.4743982779988258) internal successors, (22604), 15751 states have internal predecessors, (22604), 3557 states have call successors, (3557), 1080 states have call predecessors, (3557), 1435 states have return successors, (7155), 3684 states have call predecessors, (7155), 3539 states have call successors, (7155) [2021-11-25 20:37:52,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20324 states to 20324 states and 33316 transitions. [2021-11-25 20:37:52,239 INFO L78 Accepts]: Start accepts. Automaton has 20324 states and 33316 transitions. Word has length 138 [2021-11-25 20:37:52,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:52,240 INFO L470 AbstractCegarLoop]: Abstraction has 20324 states and 33316 transitions. [2021-11-25 20:37:52,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) [2021-11-25 20:37:52,241 INFO L276 IsEmpty]: Start isEmpty. Operand 20324 states and 33316 transitions. [2021-11-25 20:37:52,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:37:52,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:52,275 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:52,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:52,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:37:52,501 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:52,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:52,502 INFO L85 PathProgramCache]: Analyzing trace with hash 613446673, now seen corresponding path program 1 times [2021-11-25 20:37:52,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:52,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616716937] [2021-11-25 20:37:52,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:52,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:52,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:52,749 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 22 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:37:52,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:52,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616716937] [2021-11-25 20:37:52,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616716937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:52,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027675405] [2021-11-25 20:37:52,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:52,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:52,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:52,751 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:52,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:37:53,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:53,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:37:53,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:53,504 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:37:53,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:37:53,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027675405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:53,505 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:37:53,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [12] total 13 [2021-11-25 20:37:53,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088531661] [2021-11-25 20:37:53,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:53,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:37:53,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:53,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:37:53,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:37:53,508 INFO L87 Difference]: Start difference. First operand 20324 states and 33316 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 20:37:55,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:55,358 INFO L93 Difference]: Finished difference Result 46508 states and 78816 transitions. [2021-11-25 20:37:55,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:37:55,359 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 146 [2021-11-25 20:37:55,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:55,599 INFO L225 Difference]: With dead ends: 46508 [2021-11-25 20:37:55,599 INFO L226 Difference]: Without dead ends: 26196 [2021-11-25 20:37:55,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:37:55,770 INFO L933 BasicCegarLoop]: 758 mSDtfsCounter, 485 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 1323 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:55,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 1323 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:55,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26196 states. [2021-11-25 20:37:57,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26196 to 25854. [2021-11-25 20:37:57,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25854 states, 19580 states have (on average 1.4786006128702758) internal successors, (28951), 20110 states have internal predecessors, (28951), 4461 states have call successors, (4461), 1347 states have call predecessors, (4461), 1812 states have return successors, (9194), 4636 states have call predecessors, (9194), 4443 states have call successors, (9194) [2021-11-25 20:37:58,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25854 states to 25854 states and 42606 transitions. [2021-11-25 20:37:58,197 INFO L78 Accepts]: Start accepts. Automaton has 25854 states and 42606 transitions. Word has length 146 [2021-11-25 20:37:58,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:58,198 INFO L470 AbstractCegarLoop]: Abstraction has 25854 states and 42606 transitions. [2021-11-25 20:37:58,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 20:37:58,198 INFO L276 IsEmpty]: Start isEmpty. Operand 25854 states and 42606 transitions. [2021-11-25 20:37:58,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 20:37:58,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:58,244 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:58,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-25 20:37:58,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:37:58,469 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:58,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:58,470 INFO L85 PathProgramCache]: Analyzing trace with hash 2056046344, now seen corresponding path program 1 times [2021-11-25 20:37:58,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:58,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240505011] [2021-11-25 20:37:58,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:58,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:58,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:58,658 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 20:37:58,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:58,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240505011] [2021-11-25 20:37:58,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240505011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:58,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404671943] [2021-11-25 20:37:58,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:58,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:58,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:58,664 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:58,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:37:59,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:59,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 1806 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:37:59,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:59,508 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:37:59,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:00,254 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 20:38:00,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404671943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:00,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254755049] [2021-11-25 20:38:00,291 INFO L159 IcfgInterpreter]: Started Sifa with 129 locations of interest [2021-11-25 20:38:00,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:00,298 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:00,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:00,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:06,472 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 572 for LOIs [2021-11-25 20:38:13,444 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 499 for LOIs [2021-11-25 20:38:13,807 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 20:38:15,969 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 20:38:16,187 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 437 for LOIs [2021-11-25 20:38:16,271 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 437 for LOIs [2021-11-25 20:38:16,353 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 20:38:20,269 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 20:38:20,929 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 20:38:21,086 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:50,502 WARN L227 SmtUtils]: Spent 6.36s 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 20:38:57,164 WARN L227 SmtUtils]: Spent 6.36s 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 20:39:26,923 WARN L227 SmtUtils]: Spent 5.10s on a formula simplification. DAG size of input: 610 DAG size of output: 587 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:39:50,127 WARN L227 SmtUtils]: Spent 9.19s on a formula simplification. DAG size of input: 499 DAG size of output: 442 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:01,060 WARN L227 SmtUtils]: Spent 9.74s on a formula simplification. DAG size of input: 535 DAG size of output: 450 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:06,668 WARN L227 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 622 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:12,471 WARN L227 SmtUtils]: Spent 5.26s on a formula simplification. DAG size of input: 620 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:19,465 WARN L227 SmtUtils]: Spent 5.27s on a formula simplification. DAG size of input: 625 DAG size of output: 595 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:25,379 WARN L227 SmtUtils]: Spent 5.36s on a formula simplification. DAG size of input: 625 DAG size of output: 594 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:25,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1254755049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:25,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:25,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [10, 6, 7] total 44 [2021-11-25 20:40:25,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071367683] [2021-11-25 20:40:25,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:25,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:40:25,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:25,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:40:25,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1684, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:40:25,399 INFO L87 Difference]: Start difference. First operand 25854 states and 42606 transitions. Second operand has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 20:40:31,895 WARN L227 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 610 DAG size of output: 575 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:37,722 WARN L227 SmtUtils]: Spent 5.55s on a formula simplification. DAG size of input: 616 DAG size of output: 581 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:40:59,644 WARN L227 SmtUtils]: Spent 10.44s on a formula simplification. DAG size of input: 596 DAG size of output: 578 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:41:11,179 WARN L227 SmtUtils]: Spent 11.21s on a formula simplification. DAG size of input: 602 DAG size of output: 584 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:41:48,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:48,479 INFO L93 Difference]: Finished difference Result 51829 states and 85391 transitions. [2021-11-25 20:41:48,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:41:48,480 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) Word has length 156 [2021-11-25 20:41:48,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:48,618 INFO L225 Difference]: With dead ends: 51829 [2021-11-25 20:41:48,618 INFO L226 Difference]: Without dead ends: 25987 [2021-11-25 20:41:48,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 426 SyntacticMatches, 9 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 167.8s TimeCoverageRelationStatistics Valid=256, Invalid=2194, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:41:48,757 INFO L933 BasicCegarLoop]: 658 mSDtfsCounter, 300 mSDsluCounter, 5438 mSDsCounter, 0 mSdLazyCounter, 7645 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 5978 SdHoareTripleChecker+Invalid, 7742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 7645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:48,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 5978 Invalid, 7742 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [97 Valid, 7645 Invalid, 0 Unknown, 0 Unchecked, 38.1s Time] [2021-11-25 20:41:48,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25987 states. [2021-11-25 20:41:50,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25987 to 25908. [2021-11-25 20:41:50,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25908 states, 19620 states have (on average 1.4778797145769622) internal successors, (28996), 20149 states have internal predecessors, (28996), 4470 states have call successors, (4470), 1353 states have call predecessors, (4470), 1817 states have return successors, (9203), 4645 states have call predecessors, (9203), 4452 states have call successors, (9203) [2021-11-25 20:41:50,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25908 states to 25908 states and 42669 transitions. [2021-11-25 20:41:50,430 INFO L78 Accepts]: Start accepts. Automaton has 25908 states and 42669 transitions. Word has length 156 [2021-11-25 20:41:50,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:50,430 INFO L470 AbstractCegarLoop]: Abstraction has 25908 states and 42669 transitions. [2021-11-25 20:41:50,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 20:41:50,431 INFO L276 IsEmpty]: Start isEmpty. Operand 25908 states and 42669 transitions. [2021-11-25 20:41:50,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-11-25 20:41:50,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:50,447 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:50,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:50,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4022ed9f-3a9d-4b39-bfcc-61e21c2a62eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:41:50,666 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:50,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:50,667 INFO L85 PathProgramCache]: Analyzing trace with hash 2144776654, now seen corresponding path program 1 times [2021-11-25 20:41:50,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:50,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715608694] [2021-11-25 20:41:50,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:50,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:50,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:51,015 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:41:51,016 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:51,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715608694] [2021-11-25 20:41:51,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715608694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:41:51,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:41:51,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:41:51,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84449100] [2021-11-25 20:41:51,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:41:51,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:41:51,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:51,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:41:51,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:41:51,019 INFO L87 Difference]: Start difference. First operand 25908 states and 42669 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 4 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 20:41:53,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:53,853 INFO L93 Difference]: Finished difference Result 68185 states and 114851 transitions. [2021-11-25 20:41:53,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:41:53,854 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 4 states have call predecessors, (25), 3 states have call successors, (25) Word has length 179 [2021-11-25 20:41:53,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:54,125 INFO L225 Difference]: With dead ends: 68185 [2021-11-25 20:41:54,125 INFO L226 Difference]: Without dead ends: 42239 [2021-11-25 20:41:54,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:41:54,337 INFO L933 BasicCegarLoop]: 1271 mSDtfsCounter, 1132 mSDsluCounter, 1498 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1132 SdHoareTripleChecker+Valid, 2685 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:54,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1132 Valid, 2685 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:41:54,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42239 states. [2021-11-25 20:41:57,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42239 to 39833. [2021-11-25 20:41:57,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39833 states, 30125 states have (on average 1.4788713692946058) internal successors, (44551), 30948 states have internal predecessors, (44551), 6893 states have call successors, (6893), 2110 states have call predecessors, (6893), 2814 states have return successors, (14624), 7132 states have call predecessors, (14624), 6867 states have call successors, (14624) [2021-11-25 20:41:57,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39833 states to 39833 states and 66068 transitions. [2021-11-25 20:41:57,766 INFO L78 Accepts]: Start accepts. Automaton has 39833 states and 66068 transitions. Word has length 179 [2021-11-25 20:41:57,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:57,767 INFO L470 AbstractCegarLoop]: Abstraction has 39833 states and 66068 transitions. [2021-11-25 20:41:57,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 4 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 20:41:57,768 INFO L276 IsEmpty]: Start isEmpty. Operand 39833 states and 66068 transitions. [2021-11-25 20:41:57,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-25 20:41:57,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:57,782 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:41:57,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-25 20:41:57,782 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:41:57,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:57,783 INFO L85 PathProgramCache]: Analyzing trace with hash -364339345, now seen corresponding path program 1 times [2021-11-25 20:41:57,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:57,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015677006] [2021-11-25 20:41:57,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:57,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:57,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:57,935 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:41:57,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:57,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015677006] [2021-11-25 20:41:57,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015677006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:41:57,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:41:57,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:41:57,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302284205] [2021-11-25 20:41:57,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:41:57,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:41:57,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:57,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:41:57,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:41:57,938 INFO L87 Difference]: Start difference. First operand 39833 states and 66068 transitions. Second operand has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 20:42:01,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:01,149 INFO L93 Difference]: Finished difference Result 78421 states and 132470 transitions. [2021-11-25 20:42:01,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:42:01,149 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) Word has length 162 [2021-11-25 20:42:01,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:01,391 INFO L225 Difference]: With dead ends: 78421 [2021-11-25 20:42:01,391 INFO L226 Difference]: Without dead ends: 42081 [2021-11-25 20:42:01,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:42:01,606 INFO L933 BasicCegarLoop]: 600 mSDtfsCounter, 13 mSDsluCounter, 3149 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3562 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:01,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3562 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:42:01,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42081 states. [2021-11-25 20:42:03,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42081 to 41157. [2021-11-25 20:42:03,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41157 states, 30981 states have (on average 1.4656402311093897) internal successors, (45407), 31992 states have internal predecessors, (45407), 6897 states have call successors, (6897), 2110 states have call predecessors, (6897), 3278 states have return successors, (15328), 7412 states have call predecessors, (15328), 6871 states have call successors, (15328) [2021-11-25 20:42:04,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41157 states to 41157 states and 67632 transitions. [2021-11-25 20:42:04,466 INFO L78 Accepts]: Start accepts. Automaton has 41157 states and 67632 transitions. Word has length 162 [2021-11-25 20:42:04,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:04,467 INFO L470 AbstractCegarLoop]: Abstraction has 41157 states and 67632 transitions. [2021-11-25 20:42:04,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 20:42:04,467 INFO L276 IsEmpty]: Start isEmpty. Operand 41157 states and 67632 transitions. [2021-11-25 20:42:04,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-25 20:42:04,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:04,481 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:04,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 20:42:04,482 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:04,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:04,482 INFO L85 PathProgramCache]: Analyzing trace with hash 865277898, now seen corresponding path program 1 times [2021-11-25 20:42:04,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:04,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008022188] [2021-11-25 20:42:04,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:04,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:04,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:04,623 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2021-11-25 20:42:04,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:04,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008022188] [2021-11-25 20:42:04,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008022188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:42:04,624 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:42:04,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:42:04,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504635085] [2021-11-25 20:42:04,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:42:04,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:42:04,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:04,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:42:04,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:42:04,627 INFO L87 Difference]: Start difference. First operand 41157 states and 67632 transitions. Second operand has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 4 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 20:42:10,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:10,902 INFO L93 Difference]: Finished difference Result 126373 states and 218505 transitions. [2021-11-25 20:42:10,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:42:10,903 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 4 states have call predecessors, (25), 3 states have call successors, (25) Word has length 189 [2021-11-25 20:42:10,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:11,820 INFO L225 Difference]: With dead ends: 126373 [2021-11-25 20:42:11,820 INFO L226 Difference]: Without dead ends: 85160 [2021-11-25 20:42:12,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:42:12,244 INFO L933 BasicCegarLoop]: 1286 mSDtfsCounter, 1138 mSDsluCounter, 1512 mSDsCounter, 0 mSdLazyCounter, 584 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1138 SdHoareTripleChecker+Valid, 2717 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:12,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1138 Valid, 2717 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 584 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:42:12,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85160 states.