./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label08.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label08.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cfb40cb555a14fd95bceea51ff65e6513c4cf2d7cc92f4af25db414fd945afd5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:49:09,752 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:49:09,754 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:49:09,786 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:49:09,786 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:49:09,788 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:49:09,789 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:49:09,792 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:49:09,794 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:49:09,795 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:49:09,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:49:09,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:49:09,798 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:49:09,800 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:49:09,801 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:49:09,803 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:49:09,804 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:49:09,805 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:49:09,807 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:49:09,809 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:49:09,811 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:49:09,815 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:49:09,816 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:49:09,817 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:49:09,821 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:49:09,822 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:49:09,822 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:49:09,823 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:49:09,824 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:49:09,825 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:49:09,825 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:49:09,826 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:49:09,827 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:49:09,828 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:49:09,830 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:49:09,830 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:49:09,831 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:49:09,831 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:49:09,831 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:49:09,832 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:49:09,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:49:09,834 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:49:09,859 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:49:09,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:49:09,860 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:49:09,860 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:49:09,861 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:49:09,861 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:49:09,861 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:49:09,861 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:49:09,862 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:49:09,862 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:49:09,862 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:49:09,862 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:49:09,862 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:49:09,863 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:49:09,863 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:49:09,863 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:49:09,863 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:49:09,864 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:49:09,864 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:49:09,864 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:49:09,865 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:49:09,865 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:49:09,865 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:49:09,865 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:49:09,865 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:49:09,866 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:49:09,866 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:49:09,866 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:49:09,866 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:49:09,866 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:49:09,867 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:49:09,867 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:49:09,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:09,867 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:49:09,868 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:49:09,868 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:49:09,868 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:49:09,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:49:09,868 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:49:09,869 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:49:09,869 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:49:09,869 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_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cfb40cb555a14fd95bceea51ff65e6513c4cf2d7cc92f4af25db414fd945afd5 [2021-11-23 02:49:10,119 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:49:10,140 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:49:10,143 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:49:10,144 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:49:10,145 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:49:10,146 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/eca-rers2012/Problem03_label08.c [2021-11-23 02:49:10,215 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/data/8878546a2/8ea2dc88cbd246a2b63c9a3d96e0a94e/FLAG3981d537c [2021-11-23 02:49:10,897 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:49:10,898 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/sv-benchmarks/c/eca-rers2012/Problem03_label08.c [2021-11-23 02:49:10,923 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/data/8878546a2/8ea2dc88cbd246a2b63c9a3d96e0a94e/FLAG3981d537c [2021-11-23 02:49:11,072 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/data/8878546a2/8ea2dc88cbd246a2b63c9a3d96e0a94e [2021-11-23 02:49:11,075 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:49:11,076 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:49:11,080 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:11,080 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:49:11,084 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:49:11,085 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:11" (1/1) ... [2021-11-23 02:49:11,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5765debc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:11, skipping insertion in model container [2021-11-23 02:49:11,089 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:11" (1/1) ... [2021-11-23 02:49:11,098 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:49:11,188 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:49:11,869 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_0fedb74b-db69-4b61-8e72-61e250d850bf/sv-benchmarks/c/eca-rers2012/Problem03_label08.c[55410,55423] [2021-11-23 02:49:11,906 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:11,915 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:49:12,192 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_0fedb74b-db69-4b61-8e72-61e250d850bf/sv-benchmarks/c/eca-rers2012/Problem03_label08.c[55410,55423] [2021-11-23 02:49:12,210 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:12,229 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:49:12,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12 WrapperNode [2021-11-23 02:49:12,230 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:12,231 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:12,231 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:49:12,232 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:49:12,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,290 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,421 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 02:49:12,422 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:12,423 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:49:12,423 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:49:12,424 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:49:12,432 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,433 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,442 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,497 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,520 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,539 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:49:12,540 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:49:12,540 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:49:12,540 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:49:12,541 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (1/1) ... [2021-11-23 02:49:12,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:12,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:12,584 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:49:12,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:49:12,650 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:49:12,651 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:49:12,651 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:49:12,651 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:49:12,755 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:49:12,757 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:49:14,580 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:49:14,882 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:49:14,882 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:49:14,886 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:14 BoogieIcfgContainer [2021-11-23 02:49:14,886 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:49:14,890 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:49:14,890 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:49:14,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:49:14,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:49:11" (1/3) ... [2021-11-23 02:49:14,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64cd373f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:14, skipping insertion in model container [2021-11-23 02:49:14,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:12" (2/3) ... [2021-11-23 02:49:14,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64cd373f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:14, skipping insertion in model container [2021-11-23 02:49:14,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:14" (3/3) ... [2021-11-23 02:49:14,897 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label08.c [2021-11-23 02:49:14,906 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:49:14,906 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:49:14,973 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:49:14,984 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:49:14,984 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:49:15,016 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:15,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:49:15,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:15,033 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:15,033 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:15,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:15,038 INFO L85 PathProgramCache]: Analyzing trace with hash 209340343, now seen corresponding path program 1 times [2021-11-23 02:49:15,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:15,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993088518] [2021-11-23 02:49:15,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:15,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:15,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:15,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:15,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:15,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993088518] [2021-11-23 02:49:15,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993088518] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:15,784 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:15,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:15,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055430958] [2021-11-23 02:49:15,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:15,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:15,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:15,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:15,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:15,840 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:16,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:16,856 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-23 02:49:16,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:16,859 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-23 02:49:16,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:16,873 INFO L225 Difference]: With dead ends: 440 [2021-11-23 02:49:16,874 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 02:49:16,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:16,882 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:16,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 104 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:49:16,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 02:49:16,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-23 02:49:16,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.5868055555555556) internal successors, (457), 288 states have internal predecessors, (457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:16,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 457 transitions. [2021-11-23 02:49:16,945 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 457 transitions. Word has length 143 [2021-11-23 02:49:16,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:16,946 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 457 transitions. [2021-11-23 02:49:16,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:16,947 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 457 transitions. [2021-11-23 02:49:16,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-23 02:49:16,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:16,953 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:16,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:49:16,953 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:16,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:16,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1094380630, now seen corresponding path program 1 times [2021-11-23 02:49:16,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:16,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980758495] [2021-11-23 02:49:16,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:16,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:17,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:17,083 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:17,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:17,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980758495] [2021-11-23 02:49:17,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980758495] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:17,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:17,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:17,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905944803] [2021-11-23 02:49:17,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:17,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:17,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:17,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:17,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:17,092 INFO L87 Difference]: Start difference. First operand 289 states and 457 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:17,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:17,835 INFO L93 Difference]: Finished difference Result 863 states and 1368 transitions. [2021-11-23 02:49:17,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:17,836 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-23 02:49:17,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:17,839 INFO L225 Difference]: With dead ends: 863 [2021-11-23 02:49:17,840 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 02:49:17,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:17,843 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:17,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 23 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:49:17,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 02:49:17,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 02:49:17,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5452961672473868) internal successors, (887), 574 states have internal predecessors, (887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:17,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 887 transitions. [2021-11-23 02:49:17,888 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 887 transitions. Word has length 151 [2021-11-23 02:49:17,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:17,893 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 887 transitions. [2021-11-23 02:49:17,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:17,894 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 887 transitions. [2021-11-23 02:49:17,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-23 02:49:17,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:17,907 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:17,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:49:17,908 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:17,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:17,912 INFO L85 PathProgramCache]: Analyzing trace with hash -316857893, now seen corresponding path program 1 times [2021-11-23 02:49:17,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:17,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729398489] [2021-11-23 02:49:17,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:17,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:17,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:18,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:18,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729398489] [2021-11-23 02:49:18,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729398489] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:18,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:18,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:18,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730928659] [2021-11-23 02:49:18,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:18,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:18,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:18,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:18,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:18,134 INFO L87 Difference]: Start difference. First operand 575 states and 887 transitions. Second operand has 3 states, 3 states have (on average 51.0) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:18,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:18,812 INFO L93 Difference]: Finished difference Result 1435 states and 2321 transitions. [2021-11-23 02:49:18,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:18,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-23 02:49:18,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:18,819 INFO L225 Difference]: With dead ends: 1435 [2021-11-23 02:49:18,819 INFO L226 Difference]: Without dead ends: 861 [2021-11-23 02:49:18,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:18,822 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 34 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:18,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 205 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:18,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2021-11-23 02:49:18,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 861. [2021-11-23 02:49:18,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.563953488372093) internal successors, (1345), 860 states have internal predecessors, (1345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:18,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1345 transitions. [2021-11-23 02:49:18,860 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1345 transitions. Word has length 158 [2021-11-23 02:49:18,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:18,861 INFO L470 AbstractCegarLoop]: Abstraction has 861 states and 1345 transitions. [2021-11-23 02:49:18,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:18,861 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1345 transitions. [2021-11-23 02:49:18,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-23 02:49:18,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:18,867 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:18,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:49:18,867 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:18,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:18,868 INFO L85 PathProgramCache]: Analyzing trace with hash -1352605963, now seen corresponding path program 1 times [2021-11-23 02:49:18,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:18,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056395333] [2021-11-23 02:49:18,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:18,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:18,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:18,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:18,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056395333] [2021-11-23 02:49:18,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056395333] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:18,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:18,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:18,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250402196] [2021-11-23 02:49:18,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:18,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:18,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:18,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:18,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:18,990 INFO L87 Difference]: Start difference. First operand 861 states and 1345 transitions. Second operand has 4 states, 4 states have (on average 40.75) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:19,916 INFO L93 Difference]: Finished difference Result 2579 states and 4032 transitions. [2021-11-23 02:49:19,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:49:19,917 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 40.75) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 168 [2021-11-23 02:49:19,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:19,929 INFO L225 Difference]: With dead ends: 2579 [2021-11-23 02:49:19,929 INFO L226 Difference]: Without dead ends: 1719 [2021-11-23 02:49:19,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:19,933 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 397 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 397 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:19,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [397 Valid, 11 Invalid, 879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:49:19,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-23 02:49:19,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-23 02:49:19,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.438882421420256) internal successors, (2472), 1718 states have internal predecessors, (2472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2472 transitions. [2021-11-23 02:49:19,995 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2472 transitions. Word has length 168 [2021-11-23 02:49:19,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:19,995 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2472 transitions. [2021-11-23 02:49:19,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 40.75) internal successors, (163), 3 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,996 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2472 transitions. [2021-11-23 02:49:20,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 02:49:20,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:20,003 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:20,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:49:20,003 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:20,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:20,005 INFO L85 PathProgramCache]: Analyzing trace with hash 629675218, now seen corresponding path program 1 times [2021-11-23 02:49:20,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:20,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458925413] [2021-11-23 02:49:20,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:20,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:20,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:20,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:20,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458925413] [2021-11-23 02:49:20,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458925413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:20,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:20,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:20,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055294865] [2021-11-23 02:49:20,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:20,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:20,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:20,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:20,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:20,118 INFO L87 Difference]: Start difference. First operand 1719 states and 2472 transitions. Second operand has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:20,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:20,814 INFO L93 Difference]: Finished difference Result 3723 states and 5374 transitions. [2021-11-23 02:49:20,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:20,815 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-23 02:49:20,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:20,826 INFO L225 Difference]: With dead ends: 3723 [2021-11-23 02:49:20,827 INFO L226 Difference]: Without dead ends: 2005 [2021-11-23 02:49:20,829 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:20,830 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 114 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:20,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 222 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:20,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2005 states. [2021-11-23 02:49:20,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2005 to 2005. [2021-11-23 02:49:20,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 2004 states have (on average 1.4201596806387227) internal successors, (2846), 2004 states have internal predecessors, (2846), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:20,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 2846 transitions. [2021-11-23 02:49:20,892 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 2846 transitions. Word has length 192 [2021-11-23 02:49:20,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:20,893 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 2846 transitions. [2021-11-23 02:49:20,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.333333333333336) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:20,893 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 2846 transitions. [2021-11-23 02:49:20,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-11-23 02:49:20,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:20,900 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:20,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:49:20,901 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:20,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:20,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1350110218, now seen corresponding path program 1 times [2021-11-23 02:49:20,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:20,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658086909] [2021-11-23 02:49:20,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:20,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:20,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:20,980 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:49:20,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:20,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658086909] [2021-11-23 02:49:20,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658086909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:20,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:20,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:20,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743811553] [2021-11-23 02:49:20,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:20,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:20,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:20,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:20,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:20,983 INFO L87 Difference]: Start difference. First operand 2005 states and 2846 transitions. Second operand has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:21,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:21,720 INFO L93 Difference]: Finished difference Result 5439 states and 7888 transitions. [2021-11-23 02:49:21,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:21,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 198 [2021-11-23 02:49:21,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:21,741 INFO L225 Difference]: With dead ends: 5439 [2021-11-23 02:49:21,741 INFO L226 Difference]: Without dead ends: 3435 [2021-11-23 02:49:21,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:21,745 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 147 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:21,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 260 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:49:21,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-23 02:49:21,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-23 02:49:21,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.290331974373908) internal successors, (4431), 3434 states have internal predecessors, (4431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:21,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4431 transitions. [2021-11-23 02:49:21,836 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4431 transitions. Word has length 198 [2021-11-23 02:49:21,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:21,837 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4431 transitions. [2021-11-23 02:49:21,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:21,837 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4431 transitions. [2021-11-23 02:49:21,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2021-11-23 02:49:21,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:21,845 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:21,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:49:21,846 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:21,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:21,847 INFO L85 PathProgramCache]: Analyzing trace with hash -22372689, now seen corresponding path program 1 times [2021-11-23 02:49:21,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:21,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971315174] [2021-11-23 02:49:21,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:21,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:21,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:21,940 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:49:21,941 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:21,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971315174] [2021-11-23 02:49:21,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971315174] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:21,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:21,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:21,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287842300] [2021-11-23 02:49:21,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:21,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:21,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:21,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:21,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:21,944 INFO L87 Difference]: Start difference. First operand 3435 states and 4431 transitions. Second operand has 3 states, 3 states have (on average 58.0) internal successors, (174), 2 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:22,729 INFO L93 Difference]: Finished difference Result 9445 states and 12225 transitions. [2021-11-23 02:49:22,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:22,730 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 58.0) internal successors, (174), 2 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 207 [2021-11-23 02:49:22,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:22,762 INFO L225 Difference]: With dead ends: 9445 [2021-11-23 02:49:22,763 INFO L226 Difference]: Without dead ends: 6011 [2021-11-23 02:49:22,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:22,770 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 130 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:22,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 115 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:49:22,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6011 states. [2021-11-23 02:49:22,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6011 to 6009. [2021-11-23 02:49:22,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6009 states, 6008 states have (on average 1.2911118508655126) internal successors, (7757), 6008 states have internal predecessors, (7757), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6009 states to 6009 states and 7757 transitions. [2021-11-23 02:49:22,956 INFO L78 Accepts]: Start accepts. Automaton has 6009 states and 7757 transitions. Word has length 207 [2021-11-23 02:49:22,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:22,956 INFO L470 AbstractCegarLoop]: Abstraction has 6009 states and 7757 transitions. [2021-11-23 02:49:22,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.0) internal successors, (174), 2 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,957 INFO L276 IsEmpty]: Start isEmpty. Operand 6009 states and 7757 transitions. [2021-11-23 02:49:22,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-23 02:49:22,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:22,970 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:22,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:49:22,970 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:22,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1544400617, now seen corresponding path program 1 times [2021-11-23 02:49:22,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:22,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155682512] [2021-11-23 02:49:22,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:22,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:23,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:23,134 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:23,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:23,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155682512] [2021-11-23 02:49:23,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155682512] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:23,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:23,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:23,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674741049] [2021-11-23 02:49:23,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:23,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:23,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:23,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:23,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:23,138 INFO L87 Difference]: Start difference. First operand 6009 states and 7757 transitions. Second operand has 4 states, 4 states have (on average 52.0) internal successors, (208), 3 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:24,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:24,231 INFO L93 Difference]: Finished difference Result 12017 states and 15536 transitions. [2021-11-23 02:49:24,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:49:24,231 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 52.0) internal successors, (208), 3 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 208 [2021-11-23 02:49:24,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:24,267 INFO L225 Difference]: With dead ends: 12017 [2021-11-23 02:49:24,267 INFO L226 Difference]: Without dead ends: 6295 [2021-11-23 02:49:24,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:24,275 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 247 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 1068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:24,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 36 Invalid, 1068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:49:24,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6295 states. [2021-11-23 02:49:24,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6295 to 6009. [2021-11-23 02:49:24,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6009 states, 6008 states have (on average 1.2911118508655126) internal successors, (7757), 6008 states have internal predecessors, (7757), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:24,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6009 states to 6009 states and 7757 transitions. [2021-11-23 02:49:24,467 INFO L78 Accepts]: Start accepts. Automaton has 6009 states and 7757 transitions. Word has length 208 [2021-11-23 02:49:24,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:24,467 INFO L470 AbstractCegarLoop]: Abstraction has 6009 states and 7757 transitions. [2021-11-23 02:49:24,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 52.0) internal successors, (208), 3 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:24,468 INFO L276 IsEmpty]: Start isEmpty. Operand 6009 states and 7757 transitions. [2021-11-23 02:49:24,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-11-23 02:49:24,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:24,478 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:24,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:49:24,478 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:24,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:24,479 INFO L85 PathProgramCache]: Analyzing trace with hash 256294706, now seen corresponding path program 1 times [2021-11-23 02:49:24,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:24,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610155385] [2021-11-23 02:49:24,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:24,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:24,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:24,568 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:49:24,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:24,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610155385] [2021-11-23 02:49:24,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610155385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:24,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766685886] [2021-11-23 02:49:24,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:24,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:24,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:24,574 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:24,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:49:24,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:49:24,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:25,222 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:25,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:49:25,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766685886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:25,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:49:25,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:49:25,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753762760] [2021-11-23 02:49:25,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:25,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:25,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:25,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:25,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:25,226 INFO L87 Difference]: Start difference. First operand 6009 states and 7757 transitions. Second operand has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:25,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:25,990 INFO L93 Difference]: Finished difference Result 14019 states and 18237 transitions. [2021-11-23 02:49:25,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:25,991 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 215 [2021-11-23 02:49:25,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:26,035 INFO L225 Difference]: With dead ends: 14019 [2021-11-23 02:49:26,035 INFO L226 Difference]: Without dead ends: 8297 [2021-11-23 02:49:26,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 214 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:26,044 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 132 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:26,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 222 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:49:26,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8297 states. [2021-11-23 02:49:26,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8297 to 8011. [2021-11-23 02:49:26,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8011 states, 8010 states have (on average 1.2876404494382023) internal successors, (10314), 8010 states have internal predecessors, (10314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:26,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8011 states to 8011 states and 10314 transitions. [2021-11-23 02:49:26,230 INFO L78 Accepts]: Start accepts. Automaton has 8011 states and 10314 transitions. Word has length 215 [2021-11-23 02:49:26,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:26,231 INFO L470 AbstractCegarLoop]: Abstraction has 8011 states and 10314 transitions. [2021-11-23 02:49:26,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:26,231 INFO L276 IsEmpty]: Start isEmpty. Operand 8011 states and 10314 transitions. [2021-11-23 02:49:26,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2021-11-23 02:49:26,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:26,245 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:26,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:26,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:26,459 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:26,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:26,460 INFO L85 PathProgramCache]: Analyzing trace with hash 2087246553, now seen corresponding path program 1 times [2021-11-23 02:49:26,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:26,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58749789] [2021-11-23 02:49:26,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:26,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:26,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:26,587 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:49:26,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:26,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58749789] [2021-11-23 02:49:26,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58749789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:26,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772549145] [2021-11-23 02:49:26,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:26,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:26,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:26,590 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:26,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:49:26,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:26,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:49:26,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:27,194 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:49:27,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:49:27,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772549145] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:27,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:49:27,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:49:27,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8408480] [2021-11-23 02:49:27,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:27,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:27,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:27,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:27,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:27,198 INFO L87 Difference]: Start difference. First operand 8011 states and 10314 transitions. Second operand has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:27,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:27,919 INFO L93 Difference]: Finished difference Result 16879 states and 21988 transitions. [2021-11-23 02:49:27,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:27,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 235 [2021-11-23 02:49:27,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:27,939 INFO L225 Difference]: With dead ends: 16879 [2021-11-23 02:49:27,939 INFO L226 Difference]: Without dead ends: 9155 [2021-11-23 02:49:27,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 234 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:27,949 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 34 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:27,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 71 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:27,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9155 states. [2021-11-23 02:49:28,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9155 to 9012. [2021-11-23 02:49:28,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9012 states, 9011 states have (on average 1.266008212185107) internal successors, (11408), 9011 states have internal predecessors, (11408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:28,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9012 states to 9012 states and 11408 transitions. [2021-11-23 02:49:28,184 INFO L78 Accepts]: Start accepts. Automaton has 9012 states and 11408 transitions. Word has length 235 [2021-11-23 02:49:28,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:28,185 INFO L470 AbstractCegarLoop]: Abstraction has 9012 states and 11408 transitions. [2021-11-23 02:49:28,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 66.66666666666667) internal successors, (200), 3 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:28,186 INFO L276 IsEmpty]: Start isEmpty. Operand 9012 states and 11408 transitions. [2021-11-23 02:49:28,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-23 02:49:28,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:28,202 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:28,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:28,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:49:28,419 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:28,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:28,419 INFO L85 PathProgramCache]: Analyzing trace with hash -441783715, now seen corresponding path program 1 times [2021-11-23 02:49:28,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:28,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914238806] [2021-11-23 02:49:28,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:28,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:28,546 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:28,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914238806] [2021-11-23 02:49:28,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914238806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:28,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:28,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:28,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845650893] [2021-11-23 02:49:28,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:28,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:28,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:28,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:28,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:28,549 INFO L87 Difference]: Start difference. First operand 9012 states and 11408 transitions. Second operand has 3 states, 3 states have (on average 77.0) internal successors, (231), 3 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:29,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:29,313 INFO L93 Difference]: Finished difference Result 18166 states and 22961 transitions. [2021-11-23 02:49:29,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:29,315 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 77.0) internal successors, (231), 3 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 236 [2021-11-23 02:49:29,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:29,332 INFO L225 Difference]: With dead ends: 18166 [2021-11-23 02:49:29,333 INFO L226 Difference]: Without dead ends: 8869 [2021-11-23 02:49:29,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:29,342 INFO L933 BasicCegarLoop]: 232 mSDtfsCounter, 68 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:29,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 236 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:29,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8869 states. [2021-11-23 02:49:29,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8869 to 8154. [2021-11-23 02:49:29,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8154 states, 8153 states have (on average 1.1707346988838465) internal successors, (9545), 8153 states have internal predecessors, (9545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:29,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8154 states to 8154 states and 9545 transitions. [2021-11-23 02:49:29,486 INFO L78 Accepts]: Start accepts. Automaton has 8154 states and 9545 transitions. Word has length 236 [2021-11-23 02:49:29,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:29,486 INFO L470 AbstractCegarLoop]: Abstraction has 8154 states and 9545 transitions. [2021-11-23 02:49:29,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 77.0) internal successors, (231), 3 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:29,487 INFO L276 IsEmpty]: Start isEmpty. Operand 8154 states and 9545 transitions. [2021-11-23 02:49:29,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 02:49:29,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:29,504 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:29,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:49:29,504 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:29,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:29,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1282086497, now seen corresponding path program 1 times [2021-11-23 02:49:29,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:29,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241081997] [2021-11-23 02:49:29,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:29,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:29,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:29,595 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 02:49:29,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:29,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241081997] [2021-11-23 02:49:29,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241081997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:29,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:29,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:29,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067092975] [2021-11-23 02:49:29,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:29,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:29,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:29,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:29,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:29,598 INFO L87 Difference]: Start difference. First operand 8154 states and 9545 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:30,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:30,299 INFO L93 Difference]: Finished difference Result 19024 states and 22337 transitions. [2021-11-23 02:49:30,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:30,300 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 249 [2021-11-23 02:49:30,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:30,322 INFO L225 Difference]: With dead ends: 19024 [2021-11-23 02:49:30,322 INFO L226 Difference]: Without dead ends: 11157 [2021-11-23 02:49:30,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:30,333 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 130 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:30,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 54 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:30,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11157 states. [2021-11-23 02:49:30,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11157 to 11014. [2021-11-23 02:49:30,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11014 states, 11013 states have (on average 1.1701625351856897) internal successors, (12887), 11013 states have internal predecessors, (12887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:30,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11014 states to 11014 states and 12887 transitions. [2021-11-23 02:49:30,557 INFO L78 Accepts]: Start accepts. Automaton has 11014 states and 12887 transitions. Word has length 249 [2021-11-23 02:49:30,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:30,557 INFO L470 AbstractCegarLoop]: Abstraction has 11014 states and 12887 transitions. [2021-11-23 02:49:30,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:30,557 INFO L276 IsEmpty]: Start isEmpty. Operand 11014 states and 12887 transitions. [2021-11-23 02:49:30,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2021-11-23 02:49:30,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:30,576 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:30,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:49:30,577 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:30,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:30,577 INFO L85 PathProgramCache]: Analyzing trace with hash -6307023, now seen corresponding path program 1 times [2021-11-23 02:49:30,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:30,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405416671] [2021-11-23 02:49:30,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:30,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:30,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:30,678 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 110 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:49:30,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:30,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405416671] [2021-11-23 02:49:30,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405416671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:30,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:30,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:30,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485682399] [2021-11-23 02:49:30,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:30,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:30,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:30,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:30,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:30,681 INFO L87 Difference]: Start difference. First operand 11014 states and 12887 transitions. Second operand has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:31,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:31,336 INFO L93 Difference]: Finished difference Result 24744 states and 28998 transitions. [2021-11-23 02:49:31,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:31,336 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 255 [2021-11-23 02:49:31,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:31,363 INFO L225 Difference]: With dead ends: 24744 [2021-11-23 02:49:31,363 INFO L226 Difference]: Without dead ends: 14017 [2021-11-23 02:49:31,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:31,376 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 89 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:31,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 71 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:31,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14017 states. [2021-11-23 02:49:31,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14017 to 13874. [2021-11-23 02:49:31,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13874 states, 13873 states have (on average 1.167375477546313) internal successors, (16195), 13873 states have internal predecessors, (16195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:31,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13874 states to 13874 states and 16195 transitions. [2021-11-23 02:49:31,617 INFO L78 Accepts]: Start accepts. Automaton has 13874 states and 16195 transitions. Word has length 255 [2021-11-23 02:49:31,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:31,618 INFO L470 AbstractCegarLoop]: Abstraction has 13874 states and 16195 transitions. [2021-11-23 02:49:31,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 2 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:31,618 INFO L276 IsEmpty]: Start isEmpty. Operand 13874 states and 16195 transitions. [2021-11-23 02:49:31,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:49:31,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:31,638 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:31,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:49:31,638 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:31,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:31,639 INFO L85 PathProgramCache]: Analyzing trace with hash 2075699126, now seen corresponding path program 1 times [2021-11-23 02:49:31,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:31,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672879022] [2021-11-23 02:49:31,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:31,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:31,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:31,788 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 124 proven. 6 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:49:31,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:31,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672879022] [2021-11-23 02:49:31,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672879022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:31,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057066455] [2021-11-23 02:49:31,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:31,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:31,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:31,795 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:31,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:49:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:31,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:49:31,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:32,414 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 118 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 02:49:32,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:49:32,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057066455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:32,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:49:32,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-23 02:49:32,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811863146] [2021-11-23 02:49:32,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:32,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:32,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:32,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:32,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:32,420 INFO L87 Difference]: Start difference. First operand 13874 states and 16195 transitions. Second operand has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 2 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:33,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:33,103 INFO L93 Difference]: Finished difference Result 31179 states and 36787 transitions. [2021-11-23 02:49:33,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:33,103 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 2 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-23 02:49:33,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:33,132 INFO L225 Difference]: With dead ends: 31179 [2021-11-23 02:49:33,133 INFO L226 Difference]: Without dead ends: 17592 [2021-11-23 02:49:33,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:33,147 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 90 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:33,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 61 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:49:33,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17592 states. [2021-11-23 02:49:33,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17592 to 17163. [2021-11-23 02:49:33,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17163 states, 17162 states have (on average 1.13524064794313) internal successors, (19483), 17162 states have internal predecessors, (19483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:33,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17163 states to 17163 states and 19483 transitions. [2021-11-23 02:49:33,495 INFO L78 Accepts]: Start accepts. Automaton has 17163 states and 19483 transitions. Word has length 262 [2021-11-23 02:49:33,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:33,496 INFO L470 AbstractCegarLoop]: Abstraction has 17163 states and 19483 transitions. [2021-11-23 02:49:33,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 69.66666666666667) internal successors, (209), 2 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:33,496 INFO L276 IsEmpty]: Start isEmpty. Operand 17163 states and 19483 transitions. [2021-11-23 02:49:33,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-23 02:49:33,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:33,520 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:49:33,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:33,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:49:33,735 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:33,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:33,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1908392293, now seen corresponding path program 1 times [2021-11-23 02:49:33,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:33,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915499265] [2021-11-23 02:49:33,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:33,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:34,033 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:34,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:34,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915499265] [2021-11-23 02:49:34,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915499265] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:34,034 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:34,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:34,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079036079] [2021-11-23 02:49:34,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:34,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:34,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:34,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:34,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:34,036 INFO L87 Difference]: Start difference. First operand 17163 states and 19483 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:34,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:34,810 INFO L93 Difference]: Finished difference Result 34325 states and 39172 transitions. [2021-11-23 02:49:34,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:34,810 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2021-11-23 02:49:34,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:34,835 INFO L225 Difference]: With dead ends: 34325 [2021-11-23 02:49:34,836 INFO L226 Difference]: Without dead ends: 17735 [2021-11-23 02:49:34,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:34,846 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:34,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 173 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:49:34,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17735 states. [2021-11-23 02:49:35,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17735 to 17592. [2021-11-23 02:49:35,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17592 states, 17591 states have (on average 1.1435393098743676) internal successors, (20116), 17591 states have internal predecessors, (20116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:35,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17592 states to 17592 states and 20116 transitions. [2021-11-23 02:49:35,194 INFO L78 Accepts]: Start accepts. Automaton has 17592 states and 20116 transitions. Word has length 271 [2021-11-23 02:49:35,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:35,195 INFO L470 AbstractCegarLoop]: Abstraction has 17592 states and 20116 transitions. [2021-11-23 02:49:35,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:35,195 INFO L276 IsEmpty]: Start isEmpty. Operand 17592 states and 20116 transitions. [2021-11-23 02:49:35,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-11-23 02:49:35,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:35,216 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:35,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:49:35,216 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:35,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:35,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1853994794, now seen corresponding path program 1 times [2021-11-23 02:49:35,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:35,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842327483] [2021-11-23 02:49:35,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:35,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:35,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:35,335 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-23 02:49:35,335 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:35,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842327483] [2021-11-23 02:49:35,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842327483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:35,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:35,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:35,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057232026] [2021-11-23 02:49:35,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:35,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:35,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:35,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:35,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:35,338 INFO L87 Difference]: Start difference. First operand 17592 states and 20116 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:35,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:35,885 INFO L93 Difference]: Finished difference Result 35326 states and 40375 transitions. [2021-11-23 02:49:35,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:35,886 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 283 [2021-11-23 02:49:35,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:35,909 INFO L225 Difference]: With dead ends: 35326 [2021-11-23 02:49:35,909 INFO L226 Difference]: Without dead ends: 18164 [2021-11-23 02:49:35,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:35,920 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 113 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:35,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 72 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:49:35,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18164 states. [2021-11-23 02:49:36,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18164 to 18164. [2021-11-23 02:49:36,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18164 states, 18163 states have (on average 1.1406155370808788) internal successors, (20717), 18163 states have internal predecessors, (20717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:36,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18164 states to 18164 states and 20717 transitions. [2021-11-23 02:49:36,293 INFO L78 Accepts]: Start accepts. Automaton has 18164 states and 20717 transitions. Word has length 283 [2021-11-23 02:49:36,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:36,294 INFO L470 AbstractCegarLoop]: Abstraction has 18164 states and 20717 transitions. [2021-11-23 02:49:36,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:36,294 INFO L276 IsEmpty]: Start isEmpty. Operand 18164 states and 20717 transitions. [2021-11-23 02:49:36,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-23 02:49:36,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:36,312 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:36,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:49:36,312 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:36,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:36,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1619385925, now seen corresponding path program 1 times [2021-11-23 02:49:36,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:36,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376558029] [2021-11-23 02:49:36,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:36,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:36,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:36,449 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 02:49:36,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:36,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376558029] [2021-11-23 02:49:36,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376558029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:36,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:36,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:36,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112109830] [2021-11-23 02:49:36,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:36,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:36,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:36,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:36,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:36,452 INFO L87 Difference]: Start difference. First operand 18164 states and 20717 transitions. Second operand has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:37,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:37,020 INFO L93 Difference]: Finished difference Result 35326 states and 40360 transitions. [2021-11-23 02:49:37,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:37,021 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 295 [2021-11-23 02:49:37,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:37,039 INFO L225 Difference]: With dead ends: 35326 [2021-11-23 02:49:37,039 INFO L226 Difference]: Without dead ends: 18164 [2021-11-23 02:49:37,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:37,050 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 72 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:37,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:49:37,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18164 states. [2021-11-23 02:49:37,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18164 to 18164. [2021-11-23 02:49:37,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18164 states, 18163 states have (on average 1.1404503661289433) internal successors, (20714), 18163 states have internal predecessors, (20714), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:37,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18164 states to 18164 states and 20714 transitions. [2021-11-23 02:49:37,449 INFO L78 Accepts]: Start accepts. Automaton has 18164 states and 20714 transitions. Word has length 295 [2021-11-23 02:49:37,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:37,450 INFO L470 AbstractCegarLoop]: Abstraction has 18164 states and 20714 transitions. [2021-11-23 02:49:37,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:37,450 INFO L276 IsEmpty]: Start isEmpty. Operand 18164 states and 20714 transitions. [2021-11-23 02:49:37,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2021-11-23 02:49:37,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:37,468 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:37,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:49:37,468 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:37,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:37,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1434590808, now seen corresponding path program 1 times [2021-11-23 02:49:37,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:37,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779892234] [2021-11-23 02:49:37,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:37,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:37,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:37,578 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 02:49:37,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:37,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779892234] [2021-11-23 02:49:37,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779892234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:37,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:37,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:37,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266679697] [2021-11-23 02:49:37,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:37,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:37,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:37,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:37,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:37,581 INFO L87 Difference]: Start difference. First operand 18164 states and 20714 transitions. Second operand has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:38,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:38,265 INFO L93 Difference]: Finished difference Result 40762 states and 46654 transitions. [2021-11-23 02:49:38,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:38,266 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 296 [2021-11-23 02:49:38,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:38,283 INFO L225 Difference]: With dead ends: 40762 [2021-11-23 02:49:38,283 INFO L226 Difference]: Without dead ends: 23600 [2021-11-23 02:49:38,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:38,290 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 83 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:38,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 68 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:49:38,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23600 states. [2021-11-23 02:49:38,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23600 to 21024. [2021-11-23 02:49:38,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21024 states, 21023 states have (on average 1.1462208057841412) internal successors, (24097), 21023 states have internal predecessors, (24097), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:38,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21024 states to 21024 states and 24097 transitions. [2021-11-23 02:49:38,596 INFO L78 Accepts]: Start accepts. Automaton has 21024 states and 24097 transitions. Word has length 296 [2021-11-23 02:49:38,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:38,597 INFO L470 AbstractCegarLoop]: Abstraction has 21024 states and 24097 transitions. [2021-11-23 02:49:38,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:38,597 INFO L276 IsEmpty]: Start isEmpty. Operand 21024 states and 24097 transitions. [2021-11-23 02:49:38,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-23 02:49:38,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:38,617 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:38,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:49:38,617 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:49:38,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:38,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1787559534, now seen corresponding path program 1 times [2021-11-23 02:49:38,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:38,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108872320] [2021-11-23 02:49:38,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:38,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:38,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:38,950 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 161 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:38,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:38,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108872320] [2021-11-23 02:49:38,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108872320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:38,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747325134] [2021-11-23 02:49:38,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:38,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:38,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:38,955 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:38,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:49:39,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:39,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:49:39,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:39,661 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 161 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:39,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:40,236 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 161 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:49:40,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747325134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:40,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [164626009] [2021-11-23 02:49:40,274 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:49:40,274 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:40,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:40,289 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:40,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:20,299 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-23 02:55:20,473 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 16320 conjuctions. This might take some time... [2021-11-23 02:55:22,120 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:55:22,158 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-23 02:55:22,298 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 16320 conjuctions. This might take some time... [2021-11-23 02:55:23,783 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:55:24,536 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 15 [2021-11-23 02:55:24,650 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 16320 conjuctions. This might take some time... [2021-11-23 02:55:26,152 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:56:02,893 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:56:29,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [164626009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:29,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:56:29,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2021-11-23 02:56:29,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43556532] [2021-11-23 02:56:29,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:29,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:56:29,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:29,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:56:29,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:56:29,213 INFO L87 Difference]: Start difference. First operand 21024 states and 24097 transitions. Second operand has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:35,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:35,816 INFO L93 Difference]: Finished difference Result 41345 states and 47501 transitions. [2021-11-23 02:56:35,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:56:35,825 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 305 [2021-11-23 02:56:35,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:35,846 INFO L225 Difference]: With dead ends: 41345 [2021-11-23 02:56:35,847 INFO L226 Difference]: Without dead ends: 21466 [2021-11-23 02:56:35,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 919 GetRequests, 633 SyntacticMatches, 273 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1945 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:56:35,871 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 279 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 1343 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 1408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:35,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 69 Invalid, 1408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1343 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-23 02:56:35,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21466 states. [2021-11-23 02:56:36,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21466 to 21285. [2021-11-23 02:56:36,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21285 states, 21284 states have (on average 1.1465889870325128) internal successors, (24404), 21284 states have internal predecessors, (24404), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:36,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21285 states to 21285 states and 24404 transitions. [2021-11-23 02:56:36,244 INFO L78 Accepts]: Start accepts. Automaton has 21285 states and 24404 transitions. Word has length 305 [2021-11-23 02:56:36,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:36,245 INFO L470 AbstractCegarLoop]: Abstraction has 21285 states and 24404 transitions. [2021-11-23 02:56:36,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:36,245 INFO L276 IsEmpty]: Start isEmpty. Operand 21285 states and 24404 transitions. [2021-11-23 02:56:36,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2021-11-23 02:56:36,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:36,267 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:36,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:36,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:36,483 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:36,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:36,484 INFO L85 PathProgramCache]: Analyzing trace with hash -85647653, now seen corresponding path program 1 times [2021-11-23 02:56:36,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:36,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921201584] [2021-11-23 02:56:36,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:36,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:36,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2021-11-23 02:56:36,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:36,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921201584] [2021-11-23 02:56:36,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921201584] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:36,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850030980] [2021-11-23 02:56:36,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:36,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:36,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:36,624 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:36,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:56:36,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:36,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:56:36,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:37,323 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 260 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:56:37,323 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:37,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850030980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:37,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:37,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:56:37,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287701275] [2021-11-23 02:56:37,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:37,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:37,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:37,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:37,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:37,327 INFO L87 Difference]: Start difference. First operand 21285 states and 24404 transitions. Second operand has 3 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:37,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:37,998 INFO L93 Difference]: Finished difference Result 43025 states and 49442 transitions. [2021-11-23 02:56:37,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:37,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 313 [2021-11-23 02:56:37,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:38,022 INFO L225 Difference]: With dead ends: 43025 [2021-11-23 02:56:38,022 INFO L226 Difference]: Without dead ends: 23003 [2021-11-23 02:56:38,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:38,035 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 86 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:38,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 50 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:56:38,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23003 states. [2021-11-23 02:56:38,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23003 to 22715. [2021-11-23 02:56:38,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22715 states, 22714 states have (on average 1.1296557189398608) internal successors, (25659), 22714 states have internal predecessors, (25659), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:38,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22715 states to 22715 states and 25659 transitions. [2021-11-23 02:56:38,420 INFO L78 Accepts]: Start accepts. Automaton has 22715 states and 25659 transitions. Word has length 313 [2021-11-23 02:56:38,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:38,421 INFO L470 AbstractCegarLoop]: Abstraction has 22715 states and 25659 transitions. [2021-11-23 02:56:38,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 92.66666666666667) internal successors, (278), 3 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:38,421 INFO L276 IsEmpty]: Start isEmpty. Operand 22715 states and 25659 transitions. [2021-11-23 02:56:38,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2021-11-23 02:56:38,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:38,444 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:38,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:38,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:38,671 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:38,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:38,671 INFO L85 PathProgramCache]: Analyzing trace with hash 658717838, now seen corresponding path program 1 times [2021-11-23 02:56:38,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:38,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126378757] [2021-11-23 02:56:38,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:38,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:38,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:38,899 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 250 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:38,900 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:38,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126378757] [2021-11-23 02:56:38,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126378757] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:38,900 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:38,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:56:38,901 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248573339] [2021-11-23 02:56:38,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:38,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:56:38,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:38,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:56:38,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:56:38,903 INFO L87 Difference]: Start difference. First operand 22715 states and 25659 transitions. Second operand has 4 states, 4 states have (on average 79.25) internal successors, (317), 3 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:39,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:39,898 INFO L93 Difference]: Finished difference Result 45454 states and 51376 transitions. [2021-11-23 02:56:39,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:56:39,899 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 79.25) internal successors, (317), 3 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 317 [2021-11-23 02:56:39,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:39,926 INFO L225 Difference]: With dead ends: 45454 [2021-11-23 02:56:39,926 INFO L226 Difference]: Without dead ends: 23859 [2021-11-23 02:56:39,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:56:39,938 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 125 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 764 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:39,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 53 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 764 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:56:39,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23859 states. [2021-11-23 02:56:40,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23859 to 23001. [2021-11-23 02:56:40,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23001 states, 23000 states have (on average 1.1293478260869565) internal successors, (25975), 23000 states have internal predecessors, (25975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:40,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23001 states to 23001 states and 25975 transitions. [2021-11-23 02:56:40,237 INFO L78 Accepts]: Start accepts. Automaton has 23001 states and 25975 transitions. Word has length 317 [2021-11-23 02:56:40,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:40,238 INFO L470 AbstractCegarLoop]: Abstraction has 23001 states and 25975 transitions. [2021-11-23 02:56:40,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 79.25) internal successors, (317), 3 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:40,238 INFO L276 IsEmpty]: Start isEmpty. Operand 23001 states and 25975 transitions. [2021-11-23 02:56:40,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2021-11-23 02:56:40,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:40,254 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:40,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:56:40,254 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:40,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:40,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1079487395, now seen corresponding path program 1 times [2021-11-23 02:56:40,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:40,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067673226] [2021-11-23 02:56:40,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:40,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:40,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:40,572 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:56:40,573 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:40,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067673226] [2021-11-23 02:56:40,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067673226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:40,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286700735] [2021-11-23 02:56:40,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:40,574 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:40,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:40,579 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:40,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:56:40,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:40,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:56:40,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:41,334 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 219 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:56:41,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:41,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286700735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:41,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:41,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 02:56:41,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302173194] [2021-11-23 02:56:41,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:41,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:41,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:41,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:41,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:41,336 INFO L87 Difference]: Start difference. First operand 23001 states and 25975 transitions. Second operand has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:41,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:41,944 INFO L93 Difference]: Finished difference Result 46312 states and 52717 transitions. [2021-11-23 02:56:41,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:41,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 331 [2021-11-23 02:56:41,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:41,973 INFO L225 Difference]: With dead ends: 46312 [2021-11-23 02:56:41,973 INFO L226 Difference]: Without dead ends: 24717 [2021-11-23 02:56:41,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:41,985 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 41 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:41,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 170 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:56:42,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24717 states. [2021-11-23 02:56:42,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24717 to 24143. [2021-11-23 02:56:42,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24143 states, 24142 states have (on average 1.1376439400215392) internal successors, (27465), 24142 states have internal predecessors, (27465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:42,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24143 states to 24143 states and 27465 transitions. [2021-11-23 02:56:42,371 INFO L78 Accepts]: Start accepts. Automaton has 24143 states and 27465 transitions. Word has length 331 [2021-11-23 02:56:42,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:42,372 INFO L470 AbstractCegarLoop]: Abstraction has 24143 states and 27465 transitions. [2021-11-23 02:56:42,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:42,373 INFO L276 IsEmpty]: Start isEmpty. Operand 24143 states and 27465 transitions. [2021-11-23 02:56:42,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-11-23 02:56:42,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:42,391 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:42,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:42,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:42,591 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:42,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:42,592 INFO L85 PathProgramCache]: Analyzing trace with hash 131600867, now seen corresponding path program 1 times [2021-11-23 02:56:42,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:42,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417802326] [2021-11-23 02:56:42,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:42,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:42,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:42,787 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:42,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:42,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417802326] [2021-11-23 02:56:42,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417802326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:42,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874408403] [2021-11-23 02:56:42,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:42,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:42,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:42,790 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:42,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:56:42,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:42,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:56:42,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:43,643 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-23 02:56:43,643 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:43,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874408403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:43,643 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:43,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 02:56:43,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394938168] [2021-11-23 02:56:43,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:43,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:43,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:43,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:43,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:43,646 INFO L87 Difference]: Start difference. First operand 24143 states and 27465 transitions. Second operand has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:44,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:44,320 INFO L93 Difference]: Finished difference Result 49423 states and 56245 transitions. [2021-11-23 02:56:44,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:44,321 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 332 [2021-11-23 02:56:44,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:44,345 INFO L225 Difference]: With dead ends: 49423 [2021-11-23 02:56:44,345 INFO L226 Difference]: Without dead ends: 26002 [2021-11-23 02:56:44,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:44,355 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:44,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 213 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:56:44,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26002 states. [2021-11-23 02:56:44,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26002 to 24286. [2021-11-23 02:56:44,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24286 states, 24285 states have (on average 1.1367510809141446) internal successors, (27606), 24285 states have internal predecessors, (27606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:44,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24286 states to 24286 states and 27606 transitions. [2021-11-23 02:56:44,631 INFO L78 Accepts]: Start accepts. Automaton has 24286 states and 27606 transitions. Word has length 332 [2021-11-23 02:56:44,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:44,631 INFO L470 AbstractCegarLoop]: Abstraction has 24286 states and 27606 transitions. [2021-11-23 02:56:44,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:44,632 INFO L276 IsEmpty]: Start isEmpty. Operand 24286 states and 27606 transitions. [2021-11-23 02:56:44,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2021-11-23 02:56:44,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:44,655 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:44,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:44,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 02:56:44,871 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:44,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:44,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1303626149, now seen corresponding path program 1 times [2021-11-23 02:56:44,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:44,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906596713] [2021-11-23 02:56:44,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:44,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:44,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:45,018 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2021-11-23 02:56:45,018 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:45,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906596713] [2021-11-23 02:56:45,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906596713] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:45,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611380501] [2021-11-23 02:56:45,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:45,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:45,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:45,020 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:45,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fedb74b-db69-4b61-8e72-61e250d850bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:56:45,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:45,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:45,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:45,904 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 205 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:56:45,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:46,480 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 205 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:56:46,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611380501] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:46,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88647843] [2021-11-23 02:56:46,488 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:56:46,489 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:46,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:46,490 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:46,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs