./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec2_product17.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_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/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_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec2_product17.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/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_ff01eda4-21ea-409b-a8ba-73cd958016ed/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 f4d752ef50871b3af82701ffcd8ca92c2975f63f8274731e1afbb137d2562986 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:48:11,294 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:48:11,298 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:48:11,354 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:48:11,355 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:48:11,360 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:48:11,362 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:48:11,366 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:48:11,369 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:48:11,377 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:48:11,378 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:48:11,380 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:48:11,381 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:48:11,383 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:48:11,386 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:48:11,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:48:11,396 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:48:11,397 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:48:11,399 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:48:11,401 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:48:11,404 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:48:11,405 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:48:11,407 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:48:11,408 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:48:11,411 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:48:11,412 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:48:11,412 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:48:11,413 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:48:11,414 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:48:11,415 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:48:11,416 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:48:11,416 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:48:11,417 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:48:11,418 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:48:11,420 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:48:11,420 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:48:11,421 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:48:11,421 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:48:11,422 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:48:11,423 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:48:11,423 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:48:11,424 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:48:11,453 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:48:11,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:48:11,454 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:48:11,454 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:48:11,455 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:48:11,455 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:48:11,455 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:48:11,455 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:48:11,456 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:48:11,456 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:48:11,456 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:48:11,456 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:48:11,457 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:48:11,457 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:48:11,457 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:48:11,457 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:48:11,457 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:48:11,458 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:48:11,458 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:48:11,459 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:48:11,459 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:48:11,459 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:48:11,459 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:48:11,459 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:48:11,460 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:48:11,460 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:48:11,460 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:48:11,460 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:48:11,460 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:48:11,461 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:48:11,461 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:48:11,461 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:48:11,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:48:11,462 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:48:11,462 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:48:11,462 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:48:11,462 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:48:11,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:48:11,463 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:48:11,463 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:48:11,463 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:48:11,463 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_ff01eda4-21ea-409b-a8ba-73cd958016ed/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f4d752ef50871b3af82701ffcd8ca92c2975f63f8274731e1afbb137d2562986 [2021-11-25 18:48:11,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:48:11,804 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:48:11,807 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:48:11,809 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:48:11,810 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:48:11,812 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec2_product17.cil.c [2021-11-25 18:48:11,911 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/data/91a6ad73d/a71e9df2d7484a5c944307be52bf0e48/FLAGdef9c215f [2021-11-25 18:48:12,506 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:48:12,507 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/sv-benchmarks/c/product-lines/elevator_spec2_product17.cil.c [2021-11-25 18:48:12,531 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/data/91a6ad73d/a71e9df2d7484a5c944307be52bf0e48/FLAGdef9c215f [2021-11-25 18:48:12,770 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/data/91a6ad73d/a71e9df2d7484a5c944307be52bf0e48 [2021-11-25 18:48:12,774 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:48:12,777 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:48:12,781 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:48:12,781 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:48:12,785 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:48:12,786 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:48:12" (1/1) ... [2021-11-25 18:48:12,789 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72237150 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:12, skipping insertion in model container [2021-11-25 18:48:12,791 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:48:12" (1/1) ... [2021-11-25 18:48:12,798 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:48:12,897 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:48:13,181 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_ff01eda4-21ea-409b-a8ba-73cd958016ed/sv-benchmarks/c/product-lines/elevator_spec2_product17.cil.c[17414,17427] [2021-11-25 18:48:13,518 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:48:13,530 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:48:13,565 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_ff01eda4-21ea-409b-a8ba-73cd958016ed/sv-benchmarks/c/product-lines/elevator_spec2_product17.cil.c[17414,17427] [2021-11-25 18:48:13,642 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:48:13,683 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:48:13,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13 WrapperNode [2021-11-25 18:48:13,684 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:48:13,686 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:48:13,686 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:48:13,686 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:48:13,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,726 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,793 INFO L137 Inliner]: procedures = 90, calls = 332, calls flagged for inlining = 25, calls inlined = 22, statements flattened = 802 [2021-11-25 18:48:13,793 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:48:13,794 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:48:13,794 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:48:13,794 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:48:13,817 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,824 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,825 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,865 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,903 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:48:13,926 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:48:13,926 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:48:13,926 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:48:13,927 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (1/1) ... [2021-11-25 18:48:13,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:48:13,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:13,984 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:48:14,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:48:14,090 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:48:14,091 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 18:48:14,091 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 18:48:14,091 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 18:48:14,091 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 18:48:14,091 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 18:48:14,091 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 18:48:14,092 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 18:48:14,092 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 18:48:14,092 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 18:48:14,092 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 18:48:14,092 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 18:48:14,092 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 18:48:14,093 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 18:48:14,093 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 18:48:14,093 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-25 18:48:14,093 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-25 18:48:14,093 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 18:48:14,093 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 18:48:14,094 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 18:48:14,094 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 18:48:14,094 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 18:48:14,094 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 18:48:14,094 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 18:48:14,094 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 18:48:14,095 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 18:48:14,105 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 18:48:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 18:48:14,105 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 18:48:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 18:48:14,105 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 18:48:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 18:48:14,107 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 18:48:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 18:48:14,108 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 18:48:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:48:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 18:48:14,108 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 18:48:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 18:48:14,109 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 18:48:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 18:48:14,109 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 18:48:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:48:14,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:48:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 18:48:14,110 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 18:48:14,294 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:48:14,297 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:48:15,539 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:48:16,237 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:48:16,238 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:48:16,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:48:16 BoogieIcfgContainer [2021-11-25 18:48:16,243 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:48:16,245 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:48:16,246 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:48:16,249 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:48:16,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:48:12" (1/3) ... [2021-11-25 18:48:16,251 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c883839 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:48:16, skipping insertion in model container [2021-11-25 18:48:16,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:13" (2/3) ... [2021-11-25 18:48:16,251 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c883839 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:48:16, skipping insertion in model container [2021-11-25 18:48:16,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:48:16" (3/3) ... [2021-11-25 18:48:16,253 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec2_product17.cil.c [2021-11-25 18:48:16,263 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:48:16,263 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:48:16,325 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:48:16,333 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:48:16,334 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:48:16,365 INFO L276 IsEmpty]: Start isEmpty. Operand has 347 states, 236 states have (on average 1.6228813559322033) internal successors, (383), 257 states have internal predecessors, (383), 88 states have call successors, (88), 21 states have call predecessors, (88), 21 states have return successors, (88), 82 states have call predecessors, (88), 88 states have call successors, (88) [2021-11-25 18:48:16,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 18:48:16,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:16,388 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:16,389 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:16,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:16,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1061216231, now seen corresponding path program 1 times [2021-11-25 18:48:16,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:16,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275034207] [2021-11-25 18:48:16,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:16,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:16,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:16,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:16,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:16,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275034207] [2021-11-25 18:48:16,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275034207] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:16,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:16,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:48:16,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37837184] [2021-11-25 18:48:16,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:16,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:48:16,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:16,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:48:16,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:48:16,890 INFO L87 Difference]: Start difference. First operand has 347 states, 236 states have (on average 1.6228813559322033) internal successors, (383), 257 states have internal predecessors, (383), 88 states have call successors, (88), 21 states have call predecessors, (88), 21 states have return successors, (88), 82 states have call predecessors, (88), 88 states have call successors, (88) Second operand has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:48:17,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:17,089 INFO L93 Difference]: Finished difference Result 365 states and 586 transitions. [2021-11-25 18:48:17,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:48:17,092 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 51 [2021-11-25 18:48:17,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:17,123 INFO L225 Difference]: With dead ends: 365 [2021-11-25 18:48:17,123 INFO L226 Difference]: Without dead ends: 343 [2021-11-25 18:48:17,127 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:48:17,131 INFO L933 BasicCegarLoop]: 517 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:17,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 517 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:17,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-11-25 18:48:17,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 343. [2021-11-25 18:48:17,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 234 states have (on average 1.6111111111111112) internal successors, (377), 253 states have internal predecessors, (377), 88 states have call successors, (88), 21 states have call predecessors, (88), 20 states have return successors, (83), 81 states have call predecessors, (83), 83 states have call successors, (83) [2021-11-25 18:48:17,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 548 transitions. [2021-11-25 18:48:17,243 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 548 transitions. Word has length 51 [2021-11-25 18:48:17,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:17,246 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 548 transitions. [2021-11-25 18:48:17,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:48:17,246 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 548 transitions. [2021-11-25 18:48:17,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 18:48:17,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:17,255 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:17,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:48:17,256 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:17,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:17,285 INFO L85 PathProgramCache]: Analyzing trace with hash 1858721667, now seen corresponding path program 1 times [2021-11-25 18:48:17,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:17,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429994350] [2021-11-25 18:48:17,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:17,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:17,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:17,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:17,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:17,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429994350] [2021-11-25 18:48:17,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429994350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:17,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:17,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 18:48:17,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687872747] [2021-11-25 18:48:17,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:17,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:48:17,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:17,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:48:17,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:48:17,476 INFO L87 Difference]: Start difference. First operand 343 states and 548 transitions. Second operand has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:48:20,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:20,067 INFO L93 Difference]: Finished difference Result 1160 states and 1889 transitions. [2021-11-25 18:48:20,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:48:20,068 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 52 [2021-11-25 18:48:20,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:20,080 INFO L225 Difference]: With dead ends: 1160 [2021-11-25 18:48:20,080 INFO L226 Difference]: Without dead ends: 833 [2021-11-25 18:48:20,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:48:20,094 INFO L933 BasicCegarLoop]: 731 mSDtfsCounter, 1621 mSDsluCounter, 1469 mSDsCounter, 0 mSdLazyCounter, 2033 mSolverCounterSat, 506 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1684 SdHoareTripleChecker+Valid, 2100 SdHoareTripleChecker+Invalid, 2539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 506 IncrementalHoareTripleChecker+Valid, 2033 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:20,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1684 Valid, 2100 Invalid, 2539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [506 Valid, 2033 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 18:48:20,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 833 states. [2021-11-25 18:48:20,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 833 to 784. [2021-11-25 18:48:20,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 784 states, 555 states have (on average 1.6396396396396395) internal successors, (910), 590 states have internal predecessors, (910), 185 states have call successors, (185), 41 states have call predecessors, (185), 43 states have return successors, (186), 177 states have call predecessors, (186), 180 states have call successors, (186) [2021-11-25 18:48:20,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 784 states to 784 states and 1281 transitions. [2021-11-25 18:48:20,197 INFO L78 Accepts]: Start accepts. Automaton has 784 states and 1281 transitions. Word has length 52 [2021-11-25 18:48:20,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:20,197 INFO L470 AbstractCegarLoop]: Abstraction has 784 states and 1281 transitions. [2021-11-25 18:48:20,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:48:20,198 INFO L276 IsEmpty]: Start isEmpty. Operand 784 states and 1281 transitions. [2021-11-25 18:48:20,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 18:48:20,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:20,203 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:20,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:48:20,204 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:20,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:20,204 INFO L85 PathProgramCache]: Analyzing trace with hash -958925218, now seen corresponding path program 1 times [2021-11-25 18:48:20,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:20,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299522032] [2021-11-25 18:48:20,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:20,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:20,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:20,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:20,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:20,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299522032] [2021-11-25 18:48:20,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299522032] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:20,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:20,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:48:20,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744328447] [2021-11-25 18:48:20,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:20,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:48:20,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:20,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:48:20,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:20,329 INFO L87 Difference]: Start difference. First operand 784 states and 1281 transitions. Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-25 18:48:20,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:20,518 INFO L93 Difference]: Finished difference Result 1320 states and 2163 transitions. [2021-11-25 18:48:20,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:20,520 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2021-11-25 18:48:20,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:20,531 INFO L225 Difference]: With dead ends: 1320 [2021-11-25 18:48:20,531 INFO L226 Difference]: Without dead ends: 854 [2021-11-25 18:48:20,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:20,543 INFO L933 BasicCegarLoop]: 557 mSDtfsCounter, 41 mSDsluCounter, 1705 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 2159 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:20,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 2159 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:20,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 854 states. [2021-11-25 18:48:20,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 854 to 796. [2021-11-25 18:48:20,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 564 states have (on average 1.6294326241134751) internal successors, (919), 599 states have internal predecessors, (919), 185 states have call successors, (185), 41 states have call predecessors, (185), 46 states have return successors, (192), 180 states have call predecessors, (192), 180 states have call successors, (192) [2021-11-25 18:48:20,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 1296 transitions. [2021-11-25 18:48:20,640 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 1296 transitions. Word has length 56 [2021-11-25 18:48:20,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:20,643 INFO L470 AbstractCegarLoop]: Abstraction has 796 states and 1296 transitions. [2021-11-25 18:48:20,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-25 18:48:20,644 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 1296 transitions. [2021-11-25 18:48:20,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:48:20,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:20,648 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:20,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:48:20,649 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:20,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:20,650 INFO L85 PathProgramCache]: Analyzing trace with hash 913304902, now seen corresponding path program 1 times [2021-11-25 18:48:20,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:20,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186697697] [2021-11-25 18:48:20,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:20,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:20,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:20,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:20,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:20,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186697697] [2021-11-25 18:48:20,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186697697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:20,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:20,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:48:20,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26178444] [2021-11-25 18:48:20,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:20,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:48:20,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:20,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:48:20,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:48:20,910 INFO L87 Difference]: Start difference. First operand 796 states and 1296 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 18:48:23,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:23,132 INFO L93 Difference]: Finished difference Result 1815 states and 2949 transitions. [2021-11-25 18:48:23,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:48:23,133 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 60 [2021-11-25 18:48:23,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:23,142 INFO L225 Difference]: With dead ends: 1815 [2021-11-25 18:48:23,142 INFO L226 Difference]: Without dead ends: 1241 [2021-11-25 18:48:23,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:48:23,146 INFO L933 BasicCegarLoop]: 796 mSDtfsCounter, 1271 mSDsluCounter, 1164 mSDsCounter, 0 mSdLazyCounter, 2314 mSolverCounterSat, 486 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1418 SdHoareTripleChecker+Valid, 1883 SdHoareTripleChecker+Invalid, 2800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 486 IncrementalHoareTripleChecker+Valid, 2314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:23,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1418 Valid, 1883 Invalid, 2800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [486 Valid, 2314 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 18:48:23,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2021-11-25 18:48:23,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 1147. [2021-11-25 18:48:23,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 800 states have (on average 1.58375) internal successors, (1267), 852 states have internal predecessors, (1267), 273 states have call successors, (273), 65 states have call predecessors, (273), 73 states have return successors, (289), 266 states have call predecessors, (289), 268 states have call successors, (289) [2021-11-25 18:48:23,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1829 transitions. [2021-11-25 18:48:23,229 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1829 transitions. Word has length 60 [2021-11-25 18:48:23,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:23,230 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1829 transitions. [2021-11-25 18:48:23,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 18:48:23,230 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1829 transitions. [2021-11-25 18:48:23,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 18:48:23,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:23,233 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:23,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:48:23,233 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:23,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:23,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1992950992, now seen corresponding path program 1 times [2021-11-25 18:48:23,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:23,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148915966] [2021-11-25 18:48:23,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:23,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:23,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:23,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:23,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:23,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148915966] [2021-11-25 18:48:23,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148915966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:23,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:23,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:48:23,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665585429] [2021-11-25 18:48:23,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:23,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:48:23,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:23,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:48:23,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:23,335 INFO L87 Difference]: Start difference. First operand 1147 states and 1829 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:48:23,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:23,587 INFO L93 Difference]: Finished difference Result 2216 states and 3590 transitions. [2021-11-25 18:48:23,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:23,587 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 63 [2021-11-25 18:48:23,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:23,598 INFO L225 Difference]: With dead ends: 2216 [2021-11-25 18:48:23,599 INFO L226 Difference]: Without dead ends: 1147 [2021-11-25 18:48:23,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:48:23,610 INFO L933 BasicCegarLoop]: 540 mSDtfsCounter, 221 mSDsluCounter, 1474 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 1920 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:23,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 1920 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:23,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-25 18:48:23,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-25 18:48:23,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 800 states have (on average 1.54375) internal successors, (1235), 852 states have internal predecessors, (1235), 273 states have call successors, (273), 65 states have call predecessors, (273), 73 states have return successors, (289), 266 states have call predecessors, (289), 268 states have call successors, (289) [2021-11-25 18:48:23,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1797 transitions. [2021-11-25 18:48:23,698 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1797 transitions. Word has length 63 [2021-11-25 18:48:23,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:23,698 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1797 transitions. [2021-11-25 18:48:23,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:48:23,699 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1797 transitions. [2021-11-25 18:48:23,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:48:23,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:23,702 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] [2021-11-25 18:48:23,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:48:23,702 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:23,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:23,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1375980214, now seen corresponding path program 1 times [2021-11-25 18:48:23,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:23,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123390561] [2021-11-25 18:48:23,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:23,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:23,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:23,888 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 18:48:23,889 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:23,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123390561] [2021-11-25 18:48:23,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123390561] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:23,889 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:23,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 18:48:23,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024368324] [2021-11-25 18:48:23,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:23,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:48:23,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:23,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:48:23,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:48:23,891 INFO L87 Difference]: Start difference. First operand 1147 states and 1797 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:48:25,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:25,715 INFO L93 Difference]: Finished difference Result 2203 states and 3468 transitions. [2021-11-25 18:48:25,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:48:25,716 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) Word has length 65 [2021-11-25 18:48:25,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:25,728 INFO L225 Difference]: With dead ends: 2203 [2021-11-25 18:48:25,728 INFO L226 Difference]: Without dead ends: 1335 [2021-11-25 18:48:25,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:48:25,735 INFO L933 BasicCegarLoop]: 564 mSDtfsCounter, 902 mSDsluCounter, 1290 mSDsCounter, 0 mSdLazyCounter, 2023 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 972 SdHoareTripleChecker+Valid, 1762 SdHoareTripleChecker+Invalid, 2403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 2023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:25,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [972 Valid, 1762 Invalid, 2403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 2023 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 18:48:25,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1335 states. [2021-11-25 18:48:25,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1335 to 1174. [2021-11-25 18:48:25,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1174 states, 818 states have (on average 1.5366748166259168) internal successors, (1257), 874 states have internal predecessors, (1257), 274 states have call successors, (274), 70 states have call predecessors, (274), 81 states have return successors, (300), 266 states have call predecessors, (300), 269 states have call successors, (300) [2021-11-25 18:48:25,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1174 states to 1174 states and 1831 transitions. [2021-11-25 18:48:25,857 INFO L78 Accepts]: Start accepts. Automaton has 1174 states and 1831 transitions. Word has length 65 [2021-11-25 18:48:25,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:25,858 INFO L470 AbstractCegarLoop]: Abstraction has 1174 states and 1831 transitions. [2021-11-25 18:48:25,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:48:25,858 INFO L276 IsEmpty]: Start isEmpty. Operand 1174 states and 1831 transitions. [2021-11-25 18:48:25,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 18:48:25,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:25,861 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] [2021-11-25 18:48:25,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:48:25,861 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:25,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:25,862 INFO L85 PathProgramCache]: Analyzing trace with hash -50477809, now seen corresponding path program 1 times [2021-11-25 18:48:25,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:25,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027224291] [2021-11-25 18:48:25,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:25,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:25,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:25,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:48:25,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:25,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027224291] [2021-11-25 18:48:25,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027224291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:25,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:25,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:25,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503620661] [2021-11-25 18:48:25,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:25,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:25,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:25,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:25,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:25,972 INFO L87 Difference]: Start difference. First operand 1174 states and 1831 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:27,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:27,090 INFO L93 Difference]: Finished difference Result 3773 states and 5991 transitions. [2021-11-25 18:48:27,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:27,091 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 69 [2021-11-25 18:48:27,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:27,124 INFO L225 Difference]: With dead ends: 3773 [2021-11-25 18:48:27,124 INFO L226 Difference]: Without dead ends: 2615 [2021-11-25 18:48:27,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:27,133 INFO L933 BasicCegarLoop]: 517 mSDtfsCounter, 1070 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1136 SdHoareTripleChecker+Valid, 892 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:27,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1136 Valid, 892 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:48:27,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2615 states. [2021-11-25 18:48:27,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2615 to 2368. [2021-11-25 18:48:27,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2368 states, 1682 states have (on average 1.5463733650416172) internal successors, (2601), 1793 states have internal predecessors, (2601), 526 states have call successors, (526), 129 states have call predecessors, (526), 159 states have return successors, (603), 498 states have call predecessors, (603), 521 states have call successors, (603) [2021-11-25 18:48:27,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2368 states to 2368 states and 3730 transitions. [2021-11-25 18:48:27,330 INFO L78 Accepts]: Start accepts. Automaton has 2368 states and 3730 transitions. Word has length 69 [2021-11-25 18:48:27,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:27,332 INFO L470 AbstractCegarLoop]: Abstraction has 2368 states and 3730 transitions. [2021-11-25 18:48:27,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:27,334 INFO L276 IsEmpty]: Start isEmpty. Operand 2368 states and 3730 transitions. [2021-11-25 18:48:27,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:48:27,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:27,338 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] [2021-11-25 18:48:27,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:48:27,338 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:27,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:27,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1565232361, now seen corresponding path program 1 times [2021-11-25 18:48:27,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:27,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278777554] [2021-11-25 18:48:27,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:27,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:27,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:27,475 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:48:27,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:27,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278777554] [2021-11-25 18:48:27,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278777554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:27,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:27,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:27,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055312404] [2021-11-25 18:48:27,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:27,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:27,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:27,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:27,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:27,478 INFO L87 Difference]: Start difference. First operand 2368 states and 3730 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:28,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:28,683 INFO L93 Difference]: Finished difference Result 7265 states and 11641 transitions. [2021-11-25 18:48:28,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:28,684 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 70 [2021-11-25 18:48:28,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:28,735 INFO L225 Difference]: With dead ends: 7265 [2021-11-25 18:48:28,735 INFO L226 Difference]: Without dead ends: 4914 [2021-11-25 18:48:28,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:28,755 INFO L933 BasicCegarLoop]: 528 mSDtfsCounter, 1057 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1122 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:28,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1122 Valid, 900 Invalid, 994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:48:28,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4914 states. [2021-11-25 18:48:29,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4914 to 4598. [2021-11-25 18:48:29,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4598 states, 3297 states have (on average 1.5492872308158931) internal successors, (5108), 3530 states have internal predecessors, (5108), 979 states have call successors, (979), 247 states have call predecessors, (979), 321 states have return successors, (1205), 911 states have call predecessors, (1205), 974 states have call successors, (1205) [2021-11-25 18:48:29,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4598 states to 4598 states and 7292 transitions. [2021-11-25 18:48:29,125 INFO L78 Accepts]: Start accepts. Automaton has 4598 states and 7292 transitions. Word has length 70 [2021-11-25 18:48:29,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:29,126 INFO L470 AbstractCegarLoop]: Abstraction has 4598 states and 7292 transitions. [2021-11-25 18:48:29,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:29,126 INFO L276 IsEmpty]: Start isEmpty. Operand 4598 states and 7292 transitions. [2021-11-25 18:48:29,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:48:29,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:29,129 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] [2021-11-25 18:48:29,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:48:29,129 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:29,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:29,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1277979311, now seen corresponding path program 1 times [2021-11-25 18:48:29,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:29,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325382758] [2021-11-25 18:48:29,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:29,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:29,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:48:29,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:29,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325382758] [2021-11-25 18:48:29,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325382758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:29,255 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:29,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:29,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971266203] [2021-11-25 18:48:29,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:29,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:29,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:29,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:29,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:29,258 INFO L87 Difference]: Start difference. First operand 4598 states and 7292 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:30,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:30,797 INFO L93 Difference]: Finished difference Result 14019 states and 22797 transitions. [2021-11-25 18:48:30,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:30,798 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 71 [2021-11-25 18:48:30,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:30,883 INFO L225 Difference]: With dead ends: 14019 [2021-11-25 18:48:30,883 INFO L226 Difference]: Without dead ends: 9440 [2021-11-25 18:48:30,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:30,916 INFO L933 BasicCegarLoop]: 540 mSDtfsCounter, 1044 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 645 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1108 SdHoareTripleChecker+Valid, 909 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:30,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1108 Valid, 909 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 645 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 18:48:30,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9440 states. [2021-11-25 18:48:31,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9440 to 8972. [2021-11-25 18:48:31,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8972 states, 6456 states have (on average 1.5463135068153655) internal successors, (9983), 6945 states have internal predecessors, (9983), 1858 states have call successors, (1858), 483 states have call predecessors, (1858), 657 states have return successors, (2544), 1710 states have call predecessors, (2544), 1853 states have call successors, (2544) [2021-11-25 18:48:31,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8972 states to 8972 states and 14385 transitions. [2021-11-25 18:48:31,657 INFO L78 Accepts]: Start accepts. Automaton has 8972 states and 14385 transitions. Word has length 71 [2021-11-25 18:48:31,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:31,658 INFO L470 AbstractCegarLoop]: Abstraction has 8972 states and 14385 transitions. [2021-11-25 18:48:31,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:31,659 INFO L276 IsEmpty]: Start isEmpty. Operand 8972 states and 14385 transitions. [2021-11-25 18:48:31,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 18:48:31,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:31,662 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] [2021-11-25 18:48:31,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:48:31,662 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:31,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:31,663 INFO L85 PathProgramCache]: Analyzing trace with hash -963065447, now seen corresponding path program 1 times [2021-11-25 18:48:31,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:31,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670437218] [2021-11-25 18:48:31,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:31,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:31,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:31,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:48:31,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:31,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670437218] [2021-11-25 18:48:31,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670437218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:31,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:31,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:31,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990827784] [2021-11-25 18:48:31,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:31,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:31,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:31,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:31,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:31,879 INFO L87 Difference]: Start difference. First operand 8972 states and 14385 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:33,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:33,710 INFO L93 Difference]: Finished difference Result 27297 states and 45637 transitions. [2021-11-25 18:48:33,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:33,711 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 72 [2021-11-25 18:48:33,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:33,851 INFO L225 Difference]: With dead ends: 27297 [2021-11-25 18:48:33,852 INFO L226 Difference]: Without dead ends: 18348 [2021-11-25 18:48:33,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:33,911 INFO L933 BasicCegarLoop]: 552 mSDtfsCounter, 1031 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 642 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1094 SdHoareTripleChecker+Valid, 921 SdHoareTripleChecker+Invalid, 987 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:33,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1094 Valid, 921 Invalid, 987 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 642 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:48:33,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18348 states. [2021-11-25 18:48:35,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18348 to 17562. [2021-11-25 18:48:35,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17562 states, 12643 states have (on average 1.5402989796725461) internal successors, (19474), 13668 states have internal predecessors, (19474), 3565 states have call successors, (3565), 955 states have call predecessors, (3565), 1353 states have return successors, (5735), 3257 states have call predecessors, (5735), 3560 states have call successors, (5735) [2021-11-25 18:48:35,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17562 states to 17562 states and 28774 transitions. [2021-11-25 18:48:35,568 INFO L78 Accepts]: Start accepts. Automaton has 17562 states and 28774 transitions. Word has length 72 [2021-11-25 18:48:35,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:35,568 INFO L470 AbstractCegarLoop]: Abstraction has 17562 states and 28774 transitions. [2021-11-25 18:48:35,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:35,569 INFO L276 IsEmpty]: Start isEmpty. Operand 17562 states and 28774 transitions. [2021-11-25 18:48:35,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:48:35,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:35,572 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] [2021-11-25 18:48:35,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 18:48:35,573 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:35,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:35,573 INFO L85 PathProgramCache]: Analyzing trace with hash 209333651, now seen corresponding path program 1 times [2021-11-25 18:48:35,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:35,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605438550] [2021-11-25 18:48:35,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:35,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:35,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:35,676 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:48:35,676 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:35,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605438550] [2021-11-25 18:48:35,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605438550] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:35,676 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:35,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:35,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274017312] [2021-11-25 18:48:35,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:35,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:35,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:35,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:35,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:35,679 INFO L87 Difference]: Start difference. First operand 17562 states and 28774 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:38,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:38,113 INFO L93 Difference]: Finished difference Result 53545 states and 94265 transitions. [2021-11-25 18:48:38,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:38,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 73 [2021-11-25 18:48:38,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:38,363 INFO L225 Difference]: With dead ends: 53545 [2021-11-25 18:48:38,363 INFO L226 Difference]: Without dead ends: 36004 [2021-11-25 18:48:38,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:38,465 INFO L933 BasicCegarLoop]: 563 mSDtfsCounter, 1022 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 342 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1084 SdHoareTripleChecker+Valid, 936 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 342 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:38,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1084 Valid, 936 Invalid, 981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [342 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:48:38,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36004 states. [2021-11-25 18:48:41,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36004 to 34372. [2021-11-25 18:48:41,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34372 states, 24798 states have (on average 1.5369787886119848) internal successors, (38114), 26850 states have internal predecessors, (38114), 6877 states have call successors, (6877), 1896 states have call predecessors, (6877), 2696 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:48:41,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34372 states to 34372 states and 58397 transitions. [2021-11-25 18:48:41,485 INFO L78 Accepts]: Start accepts. Automaton has 34372 states and 58397 transitions. Word has length 73 [2021-11-25 18:48:41,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:41,486 INFO L470 AbstractCegarLoop]: Abstraction has 34372 states and 58397 transitions. [2021-11-25 18:48:41,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:48:41,486 INFO L276 IsEmpty]: Start isEmpty. Operand 34372 states and 58397 transitions. [2021-11-25 18:48:41,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 18:48:41,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:41,496 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:41,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 18:48:41,497 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:41,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:41,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1511272592, now seen corresponding path program 1 times [2021-11-25 18:48:41,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:41,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758729021] [2021-11-25 18:48:41,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:41,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:41,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:41,624 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 18:48:41,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:41,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758729021] [2021-11-25 18:48:41,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758729021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:41,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595417846] [2021-11-25 18:48:41,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:41,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:41,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:41,630 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:41,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:48:42,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:42,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 1763 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:48:42,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:42,729 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:48:42,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:48:42,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595417846] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:42,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:48:42,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 18:48:42,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458286447] [2021-11-25 18:48:42,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:42,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:42,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:42,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:42,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:48:42,732 INFO L87 Difference]: Start difference. First operand 34372 states and 58397 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:48:45,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:45,194 INFO L93 Difference]: Finished difference Result 72471 states and 128182 transitions. [2021-11-25 18:48:45,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:45,194 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 119 [2021-11-25 18:48:45,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:45,444 INFO L225 Difference]: With dead ends: 72471 [2021-11-25 18:48:45,444 INFO L226 Difference]: Without dead ends: 38116 [2021-11-25 18:48:45,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:48:45,837 INFO L933 BasicCegarLoop]: 438 mSDtfsCounter, 213 mSDsluCounter, 918 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1290 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:45,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1290 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:45,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38116 states. [2021-11-25 18:48:48,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38116 to 38116. [2021-11-25 18:48:48,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38116 states, 28446 states have (on average 1.5862335653518949) internal successors, (45122), 30498 states have internal predecessors, (45122), 6877 states have call successors, (6877), 1992 states have call predecessors, (6877), 2792 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:48:48,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38116 states to 38116 states and 65405 transitions. [2021-11-25 18:48:48,545 INFO L78 Accepts]: Start accepts. Automaton has 38116 states and 65405 transitions. Word has length 119 [2021-11-25 18:48:48,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:48,545 INFO L470 AbstractCegarLoop]: Abstraction has 38116 states and 65405 transitions. [2021-11-25 18:48:48,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:48:48,546 INFO L276 IsEmpty]: Start isEmpty. Operand 38116 states and 65405 transitions. [2021-11-25 18:48:48,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:48:48,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:48,558 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:48,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:48,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:48,775 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:48,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:48,775 INFO L85 PathProgramCache]: Analyzing trace with hash 99014769, now seen corresponding path program 1 times [2021-11-25 18:48:48,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:48,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780553914] [2021-11-25 18:48:48,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:48,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:48,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:49,197 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:48:49,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:49,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780553914] [2021-11-25 18:48:49,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780553914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:49,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018489507] [2021-11-25 18:48:49,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:49,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:49,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:49,200 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:49,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:48:49,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:49,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 1768 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:48:49,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:49,822 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:48:49,822 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:48:49,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018489507] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:49,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:48:49,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:48:49,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792363202] [2021-11-25 18:48:49,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:49,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:49,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:49,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:49,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:48:49,825 INFO L87 Difference]: Start difference. First operand 38116 states and 65405 transitions. Second operand has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:48:51,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:51,904 INFO L93 Difference]: Finished difference Result 79959 states and 142099 transitions. [2021-11-25 18:48:51,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:51,904 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 124 [2021-11-25 18:48:51,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:52,147 INFO L225 Difference]: With dead ends: 79959 [2021-11-25 18:48:52,147 INFO L226 Difference]: Without dead ends: 41860 [2021-11-25 18:48:52,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:48:52,435 INFO L933 BasicCegarLoop]: 438 mSDtfsCounter, 211 mSDsluCounter, 918 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1290 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:52,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1290 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:52,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41860 states. [2021-11-25 18:48:54,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41860 to 41860. [2021-11-25 18:48:54,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41860 states, 32094 states have (on average 1.6242911447622608) internal successors, (52130), 34146 states have internal predecessors, (52130), 6877 states have call successors, (6877), 2088 states have call predecessors, (6877), 2888 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:48:54,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41860 states to 41860 states and 72413 transitions. [2021-11-25 18:48:54,986 INFO L78 Accepts]: Start accepts. Automaton has 41860 states and 72413 transitions. Word has length 124 [2021-11-25 18:48:54,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:54,987 INFO L470 AbstractCegarLoop]: Abstraction has 41860 states and 72413 transitions. [2021-11-25 18:48:54,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:48:54,988 INFO L276 IsEmpty]: Start isEmpty. Operand 41860 states and 72413 transitions. [2021-11-25 18:48:54,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 18:48:55,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:55,000 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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] [2021-11-25 18:48:55,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:55,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:48:55,227 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:55,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:55,228 INFO L85 PathProgramCache]: Analyzing trace with hash -777491919, now seen corresponding path program 1 times [2021-11-25 18:48:55,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:55,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013029658] [2021-11-25 18:48:55,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:55,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:55,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:55,387 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 18:48:55,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:55,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013029658] [2021-11-25 18:48:55,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013029658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:55,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901103595] [2021-11-25 18:48:55,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:55,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:55,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:55,390 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:55,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:48:55,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:55,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 1772 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:48:55,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:56,108 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:48:56,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:48:56,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901103595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:56,109 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:48:56,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:48:56,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424634847] [2021-11-25 18:48:56,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:56,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:56,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:56,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:56,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:48:56,112 INFO L87 Difference]: Start difference. First operand 41860 states and 72413 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:48:58,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:58,542 INFO L93 Difference]: Finished difference Result 87447 states and 156016 transitions. [2021-11-25 18:48:58,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:48:58,542 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 128 [2021-11-25 18:48:58,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:58,753 INFO L225 Difference]: With dead ends: 87447 [2021-11-25 18:48:58,753 INFO L226 Difference]: Without dead ends: 45604 [2021-11-25 18:48:58,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:48:58,893 INFO L933 BasicCegarLoop]: 438 mSDtfsCounter, 209 mSDsluCounter, 918 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1290 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:58,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1290 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:48:58,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45604 states. [2021-11-25 18:49:01,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45604 to 45604. [2021-11-25 18:49:01,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45604 states, 35742 states have (on average 1.6545800458843938) internal successors, (59138), 37794 states have internal predecessors, (59138), 6877 states have call successors, (6877), 2184 states have call predecessors, (6877), 2984 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:49:01,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45604 states to 45604 states and 79421 transitions. [2021-11-25 18:49:01,264 INFO L78 Accepts]: Start accepts. Automaton has 45604 states and 79421 transitions. Word has length 128 [2021-11-25 18:49:01,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:01,264 INFO L470 AbstractCegarLoop]: Abstraction has 45604 states and 79421 transitions. [2021-11-25 18:49:01,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:49:01,265 INFO L276 IsEmpty]: Start isEmpty. Operand 45604 states and 79421 transitions. [2021-11-25 18:49:01,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 18:49:01,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:01,274 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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] [2021-11-25 18:49:01,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:01,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:49:01,499 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:01,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:01,499 INFO L85 PathProgramCache]: Analyzing trace with hash -707124880, now seen corresponding path program 1 times [2021-11-25 18:49:01,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:01,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2390649] [2021-11-25 18:49:01,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:01,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:01,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:02,288 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-25 18:49:02,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:02,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2390649] [2021-11-25 18:49:02,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2390649] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:02,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020511623] [2021-11-25 18:49:02,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:02,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:02,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:02,291 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:02,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:49:02,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:02,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 1775 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:49:03,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:03,274 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 18:49:03,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:49:03,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020511623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:03,275 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:49:03,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [25] total 27 [2021-11-25 18:49:03,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128031493] [2021-11-25 18:49:03,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:03,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:49:03,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:03,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:49:03,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:49:03,278 INFO L87 Difference]: Start difference. First operand 45604 states and 79421 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:49:05,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:05,237 INFO L93 Difference]: Finished difference Result 94935 states and 169933 transitions. [2021-11-25 18:49:05,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:49:05,238 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 131 [2021-11-25 18:49:05,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:05,697 INFO L225 Difference]: With dead ends: 94935 [2021-11-25 18:49:05,697 INFO L226 Difference]: Without dead ends: 49348 [2021-11-25 18:49:05,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:49:05,841 INFO L933 BasicCegarLoop]: 438 mSDtfsCounter, 207 mSDsluCounter, 918 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1290 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:05,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1290 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:05,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49348 states. [2021-11-25 18:49:08,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49348 to 49348. [2021-11-25 18:49:08,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49348 states, 39390 states have (on average 1.6792586951002793) internal successors, (66146), 41442 states have internal predecessors, (66146), 6877 states have call successors, (6877), 2280 states have call predecessors, (6877), 3080 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:49:08,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49348 states to 49348 states and 86429 transitions. [2021-11-25 18:49:08,306 INFO L78 Accepts]: Start accepts. Automaton has 49348 states and 86429 transitions. Word has length 131 [2021-11-25 18:49:08,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:08,306 INFO L470 AbstractCegarLoop]: Abstraction has 49348 states and 86429 transitions. [2021-11-25 18:49:08,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:49:08,307 INFO L276 IsEmpty]: Start isEmpty. Operand 49348 states and 86429 transitions. [2021-11-25 18:49:08,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-25 18:49:08,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:08,316 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 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] [2021-11-25 18:49:08,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:08,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:08,543 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:08,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:08,543 INFO L85 PathProgramCache]: Analyzing trace with hash -291528480, now seen corresponding path program 1 times [2021-11-25 18:49:08,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:08,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832334510] [2021-11-25 18:49:08,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:08,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:08,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:09,252 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 18:49:09,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:09,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832334510] [2021-11-25 18:49:09,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832334510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:09,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870908960] [2021-11-25 18:49:09,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:09,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:09,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:09,259 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:09,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:49:09,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:09,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 1777 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:49:09,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:09,922 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 18:49:09,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:49:09,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870908960] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:09,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:49:09,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [25] total 27 [2021-11-25 18:49:09,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309611149] [2021-11-25 18:49:09,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:09,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:49:09,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:09,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:49:09,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:49:09,925 INFO L87 Difference]: Start difference. First operand 49348 states and 86429 transitions. Second operand has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:49:12,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:12,442 INFO L93 Difference]: Finished difference Result 102423 states and 183850 transitions. [2021-11-25 18:49:12,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:49:12,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 133 [2021-11-25 18:49:12,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:12,700 INFO L225 Difference]: With dead ends: 102423 [2021-11-25 18:49:12,700 INFO L226 Difference]: Without dead ends: 53092 [2021-11-25 18:49:12,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:49:12,848 INFO L933 BasicCegarLoop]: 438 mSDtfsCounter, 205 mSDsluCounter, 918 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 1290 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:12,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 1290 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:12,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53092 states. [2021-11-25 18:49:15,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53092 to 53092. [2021-11-25 18:49:15,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53092 states, 43038 states have (on average 1.6997537060272319) internal successors, (73154), 45090 states have internal predecessors, (73154), 6877 states have call successors, (6877), 2376 states have call predecessors, (6877), 3176 states have return successors, (13406), 6248 states have call predecessors, (13406), 6872 states have call successors, (13406) [2021-11-25 18:49:15,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53092 states to 53092 states and 93437 transitions. [2021-11-25 18:49:15,399 INFO L78 Accepts]: Start accepts. Automaton has 53092 states and 93437 transitions. Word has length 133 [2021-11-25 18:49:15,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:15,401 INFO L470 AbstractCegarLoop]: Abstraction has 53092 states and 93437 transitions. [2021-11-25 18:49:15,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-25 18:49:15,401 INFO L276 IsEmpty]: Start isEmpty. Operand 53092 states and 93437 transitions. [2021-11-25 18:49:15,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-25 18:49:15,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:15,411 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:15,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:15,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:49:15,627 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:15,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:15,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1814184945, now seen corresponding path program 1 times [2021-11-25 18:49:15,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:15,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273114956] [2021-11-25 18:49:15,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:15,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:15,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:16,687 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 18:49:16,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:16,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273114956] [2021-11-25 18:49:16,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273114956] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:16,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553174041] [2021-11-25 18:49:16,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:16,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:16,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:16,692 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:16,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff01eda4-21ea-409b-a8ba-73cd958016ed/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:49:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:17,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 1774 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:49:17,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:17,469 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-25 18:49:17,470 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:49:17,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553174041] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:17,470 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:49:17,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [25] total 28 [2021-11-25 18:49:17,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419650127] [2021-11-25 18:49:17,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:17,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:49:17,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:17,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:49:17,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=664, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:49:17,473 INFO L87 Difference]: Start difference. First operand 53092 states and 93437 transitions. Second operand has 5 states, 5 states have (on average 14.6) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 1 states have call successors, (19) [2021-11-25 18:49:19,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:19,643 INFO L93 Difference]: Finished difference Result 54234 states and 96866 transitions. [2021-11-25 18:49:19,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:49:19,644 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.6) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 1 states have call successors, (19) Word has length 133 [2021-11-25 18:49:19,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:19,975 INFO L225 Difference]: With dead ends: 54234 [2021-11-25 18:49:19,975 INFO L226 Difference]: Without dead ends: 54077