./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/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 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:15:02,761 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:15:02,763 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:15:02,795 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:15:02,795 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:15:02,797 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:15:02,799 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:15:02,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:15:02,803 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:15:02,804 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:15:02,806 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:15:02,807 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:15:02,808 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:15:02,809 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:15:02,811 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:15:02,812 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:15:02,813 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:15:02,815 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:15:02,817 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:15:02,819 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:15:02,821 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:15:02,823 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:15:02,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:15:02,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:15:02,829 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:15:02,830 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:15:02,830 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:15:02,831 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:15:02,832 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:15:02,833 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:15:02,833 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:15:02,834 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:15:02,835 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:15:02,836 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:15:02,837 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:15:02,838 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:15:02,839 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:15:02,839 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:15:02,839 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:15:02,840 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:15:02,841 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:15:02,842 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:15:02,871 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:15:02,871 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:15:02,871 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:15:02,872 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:15:02,872 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:15:02,872 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:15:02,873 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:15:02,873 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:15:02,873 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:15:02,873 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:15:02,874 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:15:02,874 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:15:02,874 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:15:02,874 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:15:02,874 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:15:02,875 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:15:02,875 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:15:02,875 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:15:02,876 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:15:02,876 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:15:02,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:15:02,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:15:02,877 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:15:02,877 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:15:02,877 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:15:02,877 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:15:02,878 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:15:02,878 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:15:02,878 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:15:02,878 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:15:02,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:15:02,879 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:15:02,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:15:02,879 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:15:02,879 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:15:02,879 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:15:02,880 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:15:02,880 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:15:02,880 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:15:02,880 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:15:02,880 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:15:02,881 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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 [2021-11-23 03:15:03,126 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:15:03,151 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:15:03,154 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:15:03,155 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:15:03,156 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:15:03,158 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-23 03:15:03,238 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/data/b7f0ec2b4/d50b9e5f05f34bcfb1e4c4fbee150bb5/FLAGb8a0d6a15 [2021-11-23 03:15:03,878 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:15:03,879 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-23 03:15:03,914 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/data/b7f0ec2b4/d50b9e5f05f34bcfb1e4c4fbee150bb5/FLAGb8a0d6a15 [2021-11-23 03:15:04,081 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/data/b7f0ec2b4/d50b9e5f05f34bcfb1e4c4fbee150bb5 [2021-11-23 03:15:04,086 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:15:04,089 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:15:04,095 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:15:04,095 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:15:04,099 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:15:04,100 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:04,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cd5f891 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04, skipping insertion in model container [2021-11-23 03:15:04,103 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:04,110 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:15:04,195 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:15:04,754 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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-23 03:15:04,757 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:15:04,766 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:15:04,885 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_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-23 03:15:04,897 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:15:04,955 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:15:04,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04 WrapperNode [2021-11-23 03:15:04,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:15:04,957 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:15:04,957 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:15:04,957 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:15:04,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,018 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,101 INFO L137 Inliner]: procedures = 97, calls = 345, calls flagged for inlining = 27, calls inlined = 23, statements flattened = 1131 [2021-11-23 03:15:05,101 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:15:05,102 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:15:05,102 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:15:05,102 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:15:05,111 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,112 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,150 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:15:05,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:15:05,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:15:05,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:15:05,189 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (1/1) ... [2021-11-23 03:15:05,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:15:05,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:05,246 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:15:05,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:15:05,309 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-23 03:15:05,310 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-23 03:15:05,310 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-23 03:15:05,310 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-23 03:15:05,310 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-23 03:15:05,310 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-23 03:15:05,311 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-23 03:15:05,311 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-23 03:15:05,311 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-23 03:15:05,311 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-23 03:15:05,311 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-23 03:15:05,312 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-23 03:15:05,312 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-23 03:15:05,312 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-23 03:15:05,312 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-23 03:15:05,312 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-23 03:15:05,312 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-23 03:15:05,313 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-23 03:15:05,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:15:05,313 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-23 03:15:05,313 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-23 03:15:05,313 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-23 03:15:05,314 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-23 03:15:05,314 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-23 03:15:05,314 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-23 03:15:05,314 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 03:15:05,315 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 03:15:05,315 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-23 03:15:05,315 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-23 03:15:05,315 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-23 03:15:05,315 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-23 03:15:05,315 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-23 03:15:05,315 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-23 03:15:05,315 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-23 03:15:05,316 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-23 03:15:05,316 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-23 03:15:05,316 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-23 03:15:05,316 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-23 03:15:05,316 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-23 03:15:05,316 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-23 03:15:05,316 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-23 03:15:05,316 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-23 03:15:05,316 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-23 03:15:05,316 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-23 03:15:05,317 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-23 03:15:05,317 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-23 03:15:05,317 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-23 03:15:05,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:15:05,317 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-23 03:15:05,317 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-23 03:15:05,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:15:05,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:15:05,318 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-23 03:15:05,318 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-23 03:15:05,318 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2021-11-23 03:15:05,318 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2021-11-23 03:15:05,462 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:15:05,464 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:15:06,644 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:15:07,345 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:15:07,345 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:15:07,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:15:07 BoogieIcfgContainer [2021-11-23 03:15:07,350 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:15:07,354 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:15:07,355 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:15:07,358 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:15:07,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:15:04" (1/3) ... [2021-11-23 03:15:07,359 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e7da519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:15:07, skipping insertion in model container [2021-11-23 03:15:07,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:15:04" (2/3) ... [2021-11-23 03:15:07,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e7da519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:15:07, skipping insertion in model container [2021-11-23 03:15:07,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:15:07" (3/3) ... [2021-11-23 03:15:07,361 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product28.cil.c [2021-11-23 03:15:07,367 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:15:07,368 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:15:07,422 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:15:07,429 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 03:15:07,430 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:15:07,458 INFO L276 IsEmpty]: Start isEmpty. Operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) [2021-11-23 03:15:07,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 03:15:07,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:07,468 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] [2021-11-23 03:15:07,468 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:07,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:07,474 INFO L85 PathProgramCache]: Analyzing trace with hash 348250290, now seen corresponding path program 1 times [2021-11-23 03:15:07,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:07,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116111260] [2021-11-23 03:15:07,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:07,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:07,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:07,876 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 03:15:07,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:07,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116111260] [2021-11-23 03:15:07,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116111260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:07,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:07,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:15:07,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592823970] [2021-11-23 03:15:07,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:07,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:15:07,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:07,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:15:07,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:15:07,918 INFO L87 Difference]: Start difference. First operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 03:15:08,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:08,102 INFO L93 Difference]: Finished difference Result 396 states and 622 transitions. [2021-11-23 03:15:08,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:15:08,104 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 43 [2021-11-23 03:15:08,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:08,123 INFO L225 Difference]: With dead ends: 396 [2021-11-23 03:15:08,124 INFO L226 Difference]: Without dead ends: 374 [2021-11-23 03:15:08,127 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:15:08,131 INFO L933 BasicCegarLoop]: 550 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:08,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 550 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:08,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-23 03:15:08,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 374. [2021-11-23 03:15:08,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 251 states have (on average 1.5737051792828685) internal successors, (395), 272 states have internal predecessors, (395), 97 states have call successors, (97), 26 states have call predecessors, (97), 25 states have return successors, (92), 89 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-23 03:15:08,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 584 transitions. [2021-11-23 03:15:08,219 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 584 transitions. Word has length 43 [2021-11-23 03:15:08,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:08,221 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 584 transitions. [2021-11-23 03:15:08,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 03:15:08,222 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 584 transitions. [2021-11-23 03:15:08,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 03:15:08,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:08,225 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] [2021-11-23 03:15:08,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:15:08,226 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:08,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:08,226 INFO L85 PathProgramCache]: Analyzing trace with hash -32838999, now seen corresponding path program 1 times [2021-11-23 03:15:08,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:08,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960101062] [2021-11-23 03:15:08,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:08,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:08,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:08,568 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 03:15:08,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:08,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960101062] [2021-11-23 03:15:08,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [960101062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:08,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:08,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:15:08,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044133573] [2021-11-23 03:15:08,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:08,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:15:08,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:08,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:15:08,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:15:08,574 INFO L87 Difference]: Start difference. First operand 374 states and 584 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:15:10,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:10,759 INFO L93 Difference]: Finished difference Result 1210 states and 1926 transitions. [2021-11-23 03:15:10,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:15:10,759 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-23 03:15:10,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:10,776 INFO L225 Difference]: With dead ends: 1210 [2021-11-23 03:15:10,776 INFO L226 Difference]: Without dead ends: 852 [2021-11-23 03:15:10,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:15:10,793 INFO L933 BasicCegarLoop]: 561 mSDtfsCounter, 1914 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1189 mSolverCounterSat, 774 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1979 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 1963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 774 IncrementalHoareTripleChecker+Valid, 1189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:10,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1979 Valid, 1054 Invalid, 1963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [774 Valid, 1189 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 03:15:10,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 852 states. [2021-11-23 03:15:10,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 852 to 755. [2021-11-23 03:15:10,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 526 states have (on average 1.5893536121673004) internal successors, (836), 556 states have internal predecessors, (836), 181 states have call successors, (181), 46 states have call predecessors, (181), 47 states have return successors, (183), 165 states have call predecessors, (183), 176 states have call successors, (183) [2021-11-23 03:15:10,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1200 transitions. [2021-11-23 03:15:10,960 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1200 transitions. Word has length 44 [2021-11-23 03:15:10,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:10,962 INFO L470 AbstractCegarLoop]: Abstraction has 755 states and 1200 transitions. [2021-11-23 03:15:10,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:15:10,962 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1200 transitions. [2021-11-23 03:15:10,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:15:10,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:10,979 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:10,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:15:10,980 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:10,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:10,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1611720763, now seen corresponding path program 1 times [2021-11-23 03:15:10,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:10,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279847676] [2021-11-23 03:15:10,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:10,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:11,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:11,218 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:11,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:11,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279847676] [2021-11-23 03:15:11,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279847676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:11,220 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:11,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:15:11,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869978401] [2021-11-23 03:15:11,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:11,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:15:11,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:11,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:15:11,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:15:11,225 INFO L87 Difference]: Start difference. First operand 755 states and 1200 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:15:13,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:13,373 INFO L93 Difference]: Finished difference Result 2329 states and 3742 transitions. [2021-11-23 03:15:13,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:15:13,373 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 88 [2021-11-23 03:15:13,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:13,388 INFO L225 Difference]: With dead ends: 2329 [2021-11-23 03:15:13,388 INFO L226 Difference]: Without dead ends: 1591 [2021-11-23 03:15:13,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:15:13,395 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 1110 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 2222 mSolverCounterSat, 449 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1181 SdHoareTripleChecker+Valid, 1743 SdHoareTripleChecker+Invalid, 2671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 449 IncrementalHoareTripleChecker+Valid, 2222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:13,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1181 Valid, 1743 Invalid, 2671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [449 Valid, 2222 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 03:15:13,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1591 states. [2021-11-23 03:15:13,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1591 to 1522. [2021-11-23 03:15:13,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1071 states have (on average 1.5938375350140057) internal successors, (1707), 1127 states have internal predecessors, (1707), 354 states have call successors, (354), 89 states have call predecessors, (354), 96 states have return successors, (381), 329 states have call predecessors, (381), 349 states have call successors, (381) [2021-11-23 03:15:13,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2442 transitions. [2021-11-23 03:15:13,514 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2442 transitions. Word has length 88 [2021-11-23 03:15:13,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:13,515 INFO L470 AbstractCegarLoop]: Abstraction has 1522 states and 2442 transitions. [2021-11-23 03:15:13,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:15:13,515 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2442 transitions. [2021-11-23 03:15:13,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-23 03:15:13,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:13,519 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:13,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:15:13,520 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:13,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:13,521 INFO L85 PathProgramCache]: Analyzing trace with hash -646781416, now seen corresponding path program 1 times [2021-11-23 03:15:13,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:13,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325900260] [2021-11-23 03:15:13,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:13,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:13,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:13,626 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:13,626 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:13,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325900260] [2021-11-23 03:15:13,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325900260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:13,627 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:13,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:15:13,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641139334] [2021-11-23 03:15:13,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:13,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:15:13,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:13,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:15:13,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:15:13,629 INFO L87 Difference]: Start difference. First operand 1522 states and 2442 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:13,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:13,905 INFO L93 Difference]: Finished difference Result 3871 states and 6247 transitions. [2021-11-23 03:15:13,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:15:13,906 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 92 [2021-11-23 03:15:13,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:13,928 INFO L225 Difference]: With dead ends: 3871 [2021-11-23 03:15:13,929 INFO L226 Difference]: Without dead ends: 2365 [2021-11-23 03:15:13,940 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 03:15:13,941 INFO L933 BasicCegarLoop]: 667 mSDtfsCounter, 548 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 1196 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:13,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 1196 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:13,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2365 states. [2021-11-23 03:15:14,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2365 to 2337. [2021-11-23 03:15:14,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2337 states, 1649 states have (on average 1.5894481503941782) internal successors, (2621), 1738 states have internal predecessors, (2621), 539 states have call successors, (539), 134 states have call predecessors, (539), 148 states have return successors, (601), 499 states have call predecessors, (601), 534 states have call successors, (601) [2021-11-23 03:15:14,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2337 states to 2337 states and 3761 transitions. [2021-11-23 03:15:14,118 INFO L78 Accepts]: Start accepts. Automaton has 2337 states and 3761 transitions. Word has length 92 [2021-11-23 03:15:14,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:14,119 INFO L470 AbstractCegarLoop]: Abstraction has 2337 states and 3761 transitions. [2021-11-23 03:15:14,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:14,119 INFO L276 IsEmpty]: Start isEmpty. Operand 2337 states and 3761 transitions. [2021-11-23 03:15:14,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:15:14,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:14,123 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:14,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:15:14,124 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:14,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:14,124 INFO L85 PathProgramCache]: Analyzing trace with hash 1424335357, now seen corresponding path program 1 times [2021-11-23 03:15:14,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:14,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133790117] [2021-11-23 03:15:14,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:14,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:14,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:14,220 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:14,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:14,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133790117] [2021-11-23 03:15:14,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133790117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:14,221 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:14,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:15:14,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019872493] [2021-11-23 03:15:14,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:14,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:15:14,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:14,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:15:14,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:15:14,223 INFO L87 Difference]: Start difference. First operand 2337 states and 3761 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:14,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:14,601 INFO L93 Difference]: Finished difference Result 6317 states and 10232 transitions. [2021-11-23 03:15:14,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:15:14,601 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 93 [2021-11-23 03:15:14,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:14,637 INFO L225 Difference]: With dead ends: 6317 [2021-11-23 03:15:14,638 INFO L226 Difference]: Without dead ends: 3997 [2021-11-23 03:15:14,654 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 03:15:14,655 INFO L933 BasicCegarLoop]: 670 mSDtfsCounter, 547 mSDsluCounter, 563 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:14,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [547 Valid, 1202 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:14,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3997 states. [2021-11-23 03:15:14,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3997 to 3968. [2021-11-23 03:15:14,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3968 states, 2806 states have (on average 1.5855310049893085) internal successors, (4449), 2961 states have internal predecessors, (4449), 909 states have call successors, (909), 224 states have call predecessors, (909), 252 states have return successors, (1053), 839 states have call predecessors, (1053), 904 states have call successors, (1053) [2021-11-23 03:15:14,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3968 states to 3968 states and 6411 transitions. [2021-11-23 03:15:14,925 INFO L78 Accepts]: Start accepts. Automaton has 3968 states and 6411 transitions. Word has length 93 [2021-11-23 03:15:14,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:14,926 INFO L470 AbstractCegarLoop]: Abstraction has 3968 states and 6411 transitions. [2021-11-23 03:15:14,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:14,926 INFO L276 IsEmpty]: Start isEmpty. Operand 3968 states and 6411 transitions. [2021-11-23 03:15:14,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 03:15:14,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:14,930 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:14,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:15:14,931 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:14,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:14,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1204449786, now seen corresponding path program 1 times [2021-11-23 03:15:14,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:14,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231288685] [2021-11-23 03:15:14,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:14,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:14,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:15,031 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:15,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:15,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231288685] [2021-11-23 03:15:15,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231288685] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:15,032 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:15,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:15:15,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355666457] [2021-11-23 03:15:15,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:15,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:15:15,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:15,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:15:15,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:15:15,034 INFO L87 Difference]: Start difference. First operand 3968 states and 6411 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:15,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:15,546 INFO L93 Difference]: Finished difference Result 11210 states and 18292 transitions. [2021-11-23 03:15:15,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:15:15,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 94 [2021-11-23 03:15:15,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:15,617 INFO L225 Difference]: With dead ends: 11210 [2021-11-23 03:15:15,617 INFO L226 Difference]: Without dead ends: 7261 [2021-11-23 03:15:15,648 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 03:15:15,650 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 546 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 1208 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:15,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [546 Valid, 1208 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:15,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7261 states. [2021-11-23 03:15:16,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7261 to 7231. [2021-11-23 03:15:16,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7231 states, 5121 states have (on average 1.5817223198594024) internal successors, (8100), 5408 states have internal predecessors, (8100), 1649 states have call successors, (1649), 404 states have call predecessors, (1649), 460 states have return successors, (2029), 1519 states have call predecessors, (2029), 1644 states have call successors, (2029) [2021-11-23 03:15:16,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7231 states to 7231 states and 11778 transitions. [2021-11-23 03:15:16,207 INFO L78 Accepts]: Start accepts. Automaton has 7231 states and 11778 transitions. Word has length 94 [2021-11-23 03:15:16,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:16,208 INFO L470 AbstractCegarLoop]: Abstraction has 7231 states and 11778 transitions. [2021-11-23 03:15:16,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:16,210 INFO L276 IsEmpty]: Start isEmpty. Operand 7231 states and 11778 transitions. [2021-11-23 03:15:16,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:15:16,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:16,214 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:16,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:15:16,214 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:16,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:16,215 INFO L85 PathProgramCache]: Analyzing trace with hash -1317031713, now seen corresponding path program 1 times [2021-11-23 03:15:16,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:16,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903190915] [2021-11-23 03:15:16,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:16,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:16,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:16,340 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:16,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:16,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903190915] [2021-11-23 03:15:16,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903190915] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:16,341 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:16,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:15:16,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809712072] [2021-11-23 03:15:16,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:16,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:15:16,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:16,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:15:16,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:15:16,346 INFO L87 Difference]: Start difference. First operand 7231 states and 11778 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:17,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:17,114 INFO L93 Difference]: Finished difference Result 20997 states and 34763 transitions. [2021-11-23 03:15:17,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:15:17,115 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 95 [2021-11-23 03:15:17,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:17,266 INFO L225 Difference]: With dead ends: 20997 [2021-11-23 03:15:17,267 INFO L226 Difference]: Without dead ends: 13789 [2021-11-23 03:15:17,320 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 03:15:17,325 INFO L933 BasicCegarLoop]: 676 mSDtfsCounter, 545 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:17,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 1214 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:17,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13789 states. [2021-11-23 03:15:18,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13789 to 13758. [2021-11-23 03:15:18,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13758 states, 9752 states have (on average 1.5778301886792452) internal successors, (15387), 10303 states have internal predecessors, (15387), 3129 states have call successors, (3129), 764 states have call predecessors, (3129), 876 states have return successors, (4245), 2879 states have call predecessors, (4245), 3124 states have call successors, (4245) [2021-11-23 03:15:18,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13758 states to 13758 states and 22761 transitions. [2021-11-23 03:15:18,371 INFO L78 Accepts]: Start accepts. Automaton has 13758 states and 22761 transitions. Word has length 95 [2021-11-23 03:15:18,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:18,372 INFO L470 AbstractCegarLoop]: Abstraction has 13758 states and 22761 transitions. [2021-11-23 03:15:18,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:18,373 INFO L276 IsEmpty]: Start isEmpty. Operand 13758 states and 22761 transitions. [2021-11-23 03:15:18,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:15:18,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:18,378 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:18,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:15:18,379 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:18,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:18,380 INFO L85 PathProgramCache]: Analyzing trace with hash -2123498207, now seen corresponding path program 1 times [2021-11-23 03:15:18,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:18,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156218196] [2021-11-23 03:15:18,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:18,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:18,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:18,535 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:18,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:18,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156218196] [2021-11-23 03:15:18,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156218196] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:18,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:18,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:15:18,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118533758] [2021-11-23 03:15:18,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:18,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:15:18,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:18,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:15:18,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:15:18,539 INFO L87 Difference]: Start difference. First operand 13758 states and 22761 transitions. Second operand has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-23 03:15:22,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:22,327 INFO L93 Difference]: Finished difference Result 37843 states and 63447 transitions. [2021-11-23 03:15:22,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 03:15:22,328 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) Word has length 95 [2021-11-23 03:15:22,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:22,505 INFO L225 Difference]: With dead ends: 37843 [2021-11-23 03:15:22,505 INFO L226 Difference]: Without dead ends: 24101 [2021-11-23 03:15:22,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:15:22,594 INFO L933 BasicCegarLoop]: 876 mSDtfsCounter, 1263 mSDsluCounter, 1558 mSDsCounter, 0 mSdLazyCounter, 3887 mSolverCounterSat, 671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1336 SdHoareTripleChecker+Valid, 2346 SdHoareTripleChecker+Invalid, 4558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 671 IncrementalHoareTripleChecker+Valid, 3887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:22,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1336 Valid, 2346 Invalid, 4558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [671 Valid, 3887 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 03:15:22,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24101 states. [2021-11-23 03:15:24,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24101 to 22597. [2021-11-23 03:15:24,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22597 states, 15636 states have (on average 1.5519953952417498) internal successors, (24267), 16650 states have internal predecessors, (24267), 5510 states have call successors, (5510), 1205 states have call predecessors, (5510), 1450 states have return successors, (7376), 5085 states have call predecessors, (7376), 5505 states have call successors, (7376) [2021-11-23 03:15:24,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22597 states to 22597 states and 37153 transitions. [2021-11-23 03:15:24,514 INFO L78 Accepts]: Start accepts. Automaton has 22597 states and 37153 transitions. Word has length 95 [2021-11-23 03:15:24,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:24,514 INFO L470 AbstractCegarLoop]: Abstraction has 22597 states and 37153 transitions. [2021-11-23 03:15:24,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-23 03:15:24,515 INFO L276 IsEmpty]: Start isEmpty. Operand 22597 states and 37153 transitions. [2021-11-23 03:15:24,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 03:15:24,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:24,688 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:24,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:15:24,688 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:24,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:24,689 INFO L85 PathProgramCache]: Analyzing trace with hash 2121424348, now seen corresponding path program 1 times [2021-11-23 03:15:24,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:24,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144014696] [2021-11-23 03:15:24,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:24,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:24,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:24,815 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:15:24,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:24,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144014696] [2021-11-23 03:15:24,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144014696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:24,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:24,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:15:24,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478015813] [2021-11-23 03:15:24,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:24,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:15:24,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:24,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:15:24,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:15:24,819 INFO L87 Difference]: Start difference. First operand 22597 states and 37153 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:25,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:25,733 INFO L93 Difference]: Finished difference Result 23994 states and 39582 transitions. [2021-11-23 03:15:25,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:15:25,734 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 96 [2021-11-23 03:15:25,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:25,865 INFO L225 Difference]: With dead ends: 23994 [2021-11-23 03:15:25,865 INFO L226 Difference]: Without dead ends: 23983 [2021-11-23 03:15:25,876 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 03:15:25,879 INFO L933 BasicCegarLoop]: 669 mSDtfsCounter, 531 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 1212 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:25,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 1212 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:25,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23983 states. [2021-11-23 03:15:27,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23983 to 23933. [2021-11-23 03:15:27,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23933 states, 16561 states have (on average 1.549966789445082) internal successors, (25669), 17636 states have internal predecessors, (25669), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:27,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23933 states to 23933 states and 39480 transitions. [2021-11-23 03:15:27,566 INFO L78 Accepts]: Start accepts. Automaton has 23933 states and 39480 transitions. Word has length 96 [2021-11-23 03:15:27,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:27,567 INFO L470 AbstractCegarLoop]: Abstraction has 23933 states and 39480 transitions. [2021-11-23 03:15:27,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:15:27,567 INFO L276 IsEmpty]: Start isEmpty. Operand 23933 states and 39480 transitions. [2021-11-23 03:15:27,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 03:15:27,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:27,578 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-23 03:15:27,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:15:27,579 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:27,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:27,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1984437246, now seen corresponding path program 1 times [2021-11-23 03:15:27,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:27,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522174519] [2021-11-23 03:15:27,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:27,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:27,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:27,694 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 03:15:27,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:27,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522174519] [2021-11-23 03:15:27,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522174519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:27,695 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:27,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:15:27,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058682635] [2021-11-23 03:15:27,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:27,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:27,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:27,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:27,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:15:27,697 INFO L87 Difference]: Start difference. First operand 23933 states and 39480 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 03:15:29,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:29,111 INFO L93 Difference]: Finished difference Result 48767 states and 81989 transitions. [2021-11-23 03:15:29,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:29,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 149 [2021-11-23 03:15:29,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:29,282 INFO L225 Difference]: With dead ends: 48767 [2021-11-23 03:15:29,282 INFO L226 Difference]: Without dead ends: 24851 [2021-11-23 03:15:29,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:15:29,424 INFO L933 BasicCegarLoop]: 554 mSDtfsCounter, 30 mSDsluCounter, 1144 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:29,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1627 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:29,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24851 states. [2021-11-23 03:15:31,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24851 to 24041. [2021-11-23 03:15:31,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24041 states, 16669 states have (on average 1.5464035035095087) internal successors, (25777), 17744 states have internal predecessors, (25777), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:31,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24041 states to 24041 states and 39588 transitions. [2021-11-23 03:15:31,204 INFO L78 Accepts]: Start accepts. Automaton has 24041 states and 39588 transitions. Word has length 149 [2021-11-23 03:15:31,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:31,205 INFO L470 AbstractCegarLoop]: Abstraction has 24041 states and 39588 transitions. [2021-11-23 03:15:31,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 03:15:31,206 INFO L276 IsEmpty]: Start isEmpty. Operand 24041 states and 39588 transitions. [2021-11-23 03:15:31,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 03:15:31,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:31,216 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-23 03:15:31,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:15:31,217 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:31,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:31,218 INFO L85 PathProgramCache]: Analyzing trace with hash 564576189, now seen corresponding path program 1 times [2021-11-23 03:15:31,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:31,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454282146] [2021-11-23 03:15:31,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:31,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:31,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:31,716 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 03:15:31,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:31,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454282146] [2021-11-23 03:15:31,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454282146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:31,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394071573] [2021-11-23 03:15:31,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:31,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:31,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:31,721 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:31,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:15:32,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:32,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 2087 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:15:32,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:32,444 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 03:15:32,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:32,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394071573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:32,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:32,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2021-11-23 03:15:32,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462228375] [2021-11-23 03:15:32,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:32,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:32,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:32,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:32,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:15:32,448 INFO L87 Difference]: Start difference. First operand 24041 states and 39588 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:34,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:34,132 INFO L93 Difference]: Finished difference Result 49469 states and 83913 transitions. [2021-11-23 03:15:34,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:34,133 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 152 [2021-11-23 03:15:34,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:34,344 INFO L225 Difference]: With dead ends: 49469 [2021-11-23 03:15:34,344 INFO L226 Difference]: Without dead ends: 25445 [2021-11-23 03:15:34,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:15:34,480 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 213 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:34,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1419 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:15:34,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25445 states. [2021-11-23 03:15:35,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25445 to 25445. [2021-11-23 03:15:35,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25445 states, 18037 states have (on average 1.5748184287852747) internal successors, (28405), 19112 states have internal predecessors, (28405), 5836 states have call successors, (5836), 1312 states have call predecessors, (5836), 1571 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:36,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25445 states to 25445 states and 42216 transitions. [2021-11-23 03:15:36,016 INFO L78 Accepts]: Start accepts. Automaton has 25445 states and 42216 transitions. Word has length 152 [2021-11-23 03:15:36,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:36,016 INFO L470 AbstractCegarLoop]: Abstraction has 25445 states and 42216 transitions. [2021-11-23 03:15:36,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:36,017 INFO L276 IsEmpty]: Start isEmpty. Operand 25445 states and 42216 transitions. [2021-11-23 03:15:36,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 03:15:36,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:36,032 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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] [2021-11-23 03:15:36,064 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:15:36,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:15:36,257 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:36,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:36,258 INFO L85 PathProgramCache]: Analyzing trace with hash 968921967, now seen corresponding path program 1 times [2021-11-23 03:15:36,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:36,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867323107] [2021-11-23 03:15:36,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:36,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:36,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:36,378 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 03:15:36,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:36,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867323107] [2021-11-23 03:15:36,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867323107] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:36,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220359997] [2021-11-23 03:15:36,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:36,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:36,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:36,380 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:36,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:15:36,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:36,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 2092 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:15:36,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:37,048 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:15:37,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:37,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220359997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:37,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:37,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 03:15:37,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952566237] [2021-11-23 03:15:37,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:37,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:37,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:37,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:37,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:15:37,051 INFO L87 Difference]: Start difference. First operand 25445 states and 42216 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:38,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:38,623 INFO L93 Difference]: Finished difference Result 52277 states and 89029 transitions. [2021-11-23 03:15:38,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:38,624 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 157 [2021-11-23 03:15:38,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:38,809 INFO L225 Difference]: With dead ends: 52277 [2021-11-23 03:15:38,809 INFO L226 Difference]: Without dead ends: 26849 [2021-11-23 03:15:38,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:15:38,926 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 211 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:38,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1419 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:15:38,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26849 states. [2021-11-23 03:15:40,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26849 to 26849. [2021-11-23 03:15:40,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26849 states, 19405 states have (on average 1.599227003349652) internal successors, (31033), 20480 states have internal predecessors, (31033), 5836 states have call successors, (5836), 1348 states have call predecessors, (5836), 1607 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:40,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26849 states to 26849 states and 44844 transitions. [2021-11-23 03:15:40,345 INFO L78 Accepts]: Start accepts. Automaton has 26849 states and 44844 transitions. Word has length 157 [2021-11-23 03:15:40,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:40,346 INFO L470 AbstractCegarLoop]: Abstraction has 26849 states and 44844 transitions. [2021-11-23 03:15:40,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:40,346 INFO L276 IsEmpty]: Start isEmpty. Operand 26849 states and 44844 transitions. [2021-11-23 03:15:40,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 03:15:40,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:40,357 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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] [2021-11-23 03:15:40,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:40,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:15:40,574 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:40,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:40,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1424418927, now seen corresponding path program 1 times [2021-11-23 03:15:40,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:40,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642271582] [2021-11-23 03:15:40,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:40,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:40,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:40,681 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:15:40,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:40,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642271582] [2021-11-23 03:15:40,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642271582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:40,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573233641] [2021-11-23 03:15:40,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:40,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:40,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:40,683 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:40,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:15:41,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:41,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 2096 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:15:41,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:41,305 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:15:41,305 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:41,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573233641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:41,305 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:41,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 03:15:41,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559755459] [2021-11-23 03:15:41,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:41,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:41,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:41,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:41,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:15:41,307 INFO L87 Difference]: Start difference. First operand 26849 states and 44844 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:42,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:42,453 INFO L93 Difference]: Finished difference Result 55085 states and 94145 transitions. [2021-11-23 03:15:42,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:42,453 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 161 [2021-11-23 03:15:42,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:42,615 INFO L225 Difference]: With dead ends: 55085 [2021-11-23 03:15:42,615 INFO L226 Difference]: Without dead ends: 28253 [2021-11-23 03:15:42,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:15:42,713 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 209 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:42,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1419 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:15:42,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28253 states. [2021-11-23 03:15:44,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28253 to 28253. [2021-11-23 03:15:44,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28253 states, 20773 states have (on average 1.620420738458576) internal successors, (33661), 21848 states have internal predecessors, (33661), 5836 states have call successors, (5836), 1384 states have call predecessors, (5836), 1643 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:44,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28253 states to 28253 states and 47472 transitions. [2021-11-23 03:15:44,195 INFO L78 Accepts]: Start accepts. Automaton has 28253 states and 47472 transitions. Word has length 161 [2021-11-23 03:15:44,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:44,196 INFO L470 AbstractCegarLoop]: Abstraction has 28253 states and 47472 transitions. [2021-11-23 03:15:44,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:44,197 INFO L276 IsEmpty]: Start isEmpty. Operand 28253 states and 47472 transitions. [2021-11-23 03:15:44,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 03:15:44,207 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:44,207 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:44,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:44,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:44,421 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:44,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:44,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1683096355, now seen corresponding path program 1 times [2021-11-23 03:15:44,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:44,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867557221] [2021-11-23 03:15:44,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:44,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:44,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:45,194 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 03:15:45,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:45,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867557221] [2021-11-23 03:15:45,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867557221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:45,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297877569] [2021-11-23 03:15:45,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:45,195 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:45,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:45,201 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:45,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:15:45,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:45,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 2099 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:15:45,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:45,863 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:15:45,864 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:45,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297877569] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:45,864 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:45,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-23 03:15:45,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774308535] [2021-11-23 03:15:45,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:45,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:45,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:45,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:45,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:15:45,867 INFO L87 Difference]: Start difference. First operand 28253 states and 47472 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:46,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:46,896 INFO L93 Difference]: Finished difference Result 57893 states and 99261 transitions. [2021-11-23 03:15:46,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:46,897 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 164 [2021-11-23 03:15:46,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:47,071 INFO L225 Difference]: With dead ends: 57893 [2021-11-23 03:15:47,072 INFO L226 Difference]: Without dead ends: 29657 [2021-11-23 03:15:47,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:15:47,171 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 207 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:47,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1419 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:15:47,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29657 states. [2021-11-23 03:15:48,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29657 to 29657. [2021-11-23 03:15:48,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29657 states, 22141 states have (on average 1.6389955286572422) internal successors, (36289), 23216 states have internal predecessors, (36289), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1679 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-23 03:15:48,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29657 states to 29657 states and 50100 transitions. [2021-11-23 03:15:48,585 INFO L78 Accepts]: Start accepts. Automaton has 29657 states and 50100 transitions. Word has length 164 [2021-11-23 03:15:48,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:48,585 INFO L470 AbstractCegarLoop]: Abstraction has 29657 states and 50100 transitions. [2021-11-23 03:15:48,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:48,586 INFO L276 IsEmpty]: Start isEmpty. Operand 29657 states and 50100 transitions. [2021-11-23 03:15:48,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-23 03:15:48,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:48,597 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:48,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:48,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 03:15:48,813 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:48,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:48,814 INFO L85 PathProgramCache]: Analyzing trace with hash -58534929, now seen corresponding path program 1 times [2021-11-23 03:15:48,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:48,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26641659] [2021-11-23 03:15:48,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:48,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:48,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:49,557 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 03:15:49,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:49,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26641659] [2021-11-23 03:15:49,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26641659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:49,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95756106] [2021-11-23 03:15:49,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:49,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:49,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:49,559 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:49,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:15:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:49,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 2095 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:15:49,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 03:15:50,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:50,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95756106] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:50,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:50,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-23 03:15:50,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315442847] [2021-11-23 03:15:50,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:50,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:15:50,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:50,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:15:50,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:15:50,314 INFO L87 Difference]: Start difference. First operand 29657 states and 50100 transitions. Second operand has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:51,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:51,746 INFO L93 Difference]: Finished difference Result 59422 states and 100470 transitions. [2021-11-23 03:15:51,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:15:51,746 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) Word has length 166 [2021-11-23 03:15:51,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:51,891 INFO L225 Difference]: With dead ends: 59422 [2021-11-23 03:15:51,891 INFO L226 Difference]: Without dead ends: 29797 [2021-11-23 03:15:51,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=125, Invalid=1135, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:15:51,990 INFO L933 BasicCegarLoop]: 627 mSDtfsCounter, 320 mSDsluCounter, 1887 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 2386 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:51,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 2386 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:15:52,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29797 states. [2021-11-23 03:15:53,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29797 to 29669. [2021-11-23 03:15:53,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29669 states, 22147 states have (on average 1.6340813654219533) internal successors, (36190), 23228 states have internal predecessors, (36190), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-23 03:15:53,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29669 states to 29669 states and 50011 transitions. [2021-11-23 03:15:53,289 INFO L78 Accepts]: Start accepts. Automaton has 29669 states and 50011 transitions. Word has length 166 [2021-11-23 03:15:53,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:53,289 INFO L470 AbstractCegarLoop]: Abstraction has 29669 states and 50011 transitions. [2021-11-23 03:15:53,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:15:53,290 INFO L276 IsEmpty]: Start isEmpty. Operand 29669 states and 50011 transitions. [2021-11-23 03:15:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 03:15:53,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:53,299 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:53,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:53,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:15:53,525 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:53,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:53,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1401682805, now seen corresponding path program 1 times [2021-11-23 03:15:53,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:53,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180010581] [2021-11-23 03:15:53,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:53,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:53,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:54,279 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 03:15:54,280 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:54,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180010581] [2021-11-23 03:15:54,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180010581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:54,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800255337] [2021-11-23 03:15:54,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:54,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:54,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:54,281 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:54,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:15:54,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:54,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 2101 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:15:54,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:55,024 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 03:15:55,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:55,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800255337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:55,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:55,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 33 [2021-11-23 03:15:55,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390194520] [2021-11-23 03:15:55,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:55,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:15:55,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:55,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:15:55,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:15:55,026 INFO L87 Difference]: Start difference. First operand 29669 states and 50011 transitions. Second operand has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-23 03:15:56,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:56,258 INFO L93 Difference]: Finished difference Result 30335 states and 51534 transitions. [2021-11-23 03:15:56,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:15:56,259 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) Word has length 169 [2021-11-23 03:15:56,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:56,450 INFO L225 Difference]: With dead ends: 30335 [2021-11-23 03:15:56,451 INFO L226 Difference]: Without dead ends: 30249 [2021-11-23 03:15:56,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:15:56,475 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 509 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:56,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [517 Valid, 900 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:15:56,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30249 states. [2021-11-23 03:15:57,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30249 to 29701. [2021-11-23 03:15:57,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29701 states, 22179 states have (on average 1.6331665088597322) internal successors, (36222), 23260 states have internal predecessors, (36222), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-23 03:15:57,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29701 states to 29701 states and 50043 transitions. [2021-11-23 03:15:57,804 INFO L78 Accepts]: Start accepts. Automaton has 29701 states and 50043 transitions. Word has length 169 [2021-11-23 03:15:57,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:57,804 INFO L470 AbstractCegarLoop]: Abstraction has 29701 states and 50043 transitions. [2021-11-23 03:15:57,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-23 03:15:57,805 INFO L276 IsEmpty]: Start isEmpty. Operand 29701 states and 50043 transitions. [2021-11-23 03:15:57,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-23 03:15:57,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:57,812 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:57,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:58,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:15:58,025 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:58,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:58,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1058315205, now seen corresponding path program 1 times [2021-11-23 03:15:58,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:58,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041896021] [2021-11-23 03:15:58,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:58,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:58,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:58,758 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 03:15:58,758 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:58,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041896021] [2021-11-23 03:15:58,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041896021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:15:58,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140543759] [2021-11-23 03:15:58,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:58,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:58,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:58,760 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:58,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:15:59,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:59,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:15:59,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:59,747 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 03:15:59,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:59,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140543759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:59,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:15:59,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-23 03:15:59,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023936692] [2021-11-23 03:15:59,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:59,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:15:59,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:59,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:15:59,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1006, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:15:59,751 INFO L87 Difference]: Start difference. First operand 29701 states and 50043 transitions. Second operand has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 03:16:01,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:01,010 INFO L93 Difference]: Finished difference Result 33213 states and 57235 transitions. [2021-11-23 03:16:01,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:16:01,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 174 [2021-11-23 03:16:01,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:01,128 INFO L225 Difference]: With dead ends: 33213 [2021-11-23 03:16:01,129 INFO L226 Difference]: Without dead ends: 33127 [2021-11-23 03:16:01,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:16:01,142 INFO L933 BasicCegarLoop]: 558 mSDtfsCounter, 492 mSDsluCounter, 1674 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 2119 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:01,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [494 Valid, 2119 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:16:01,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33127 states. [2021-11-23 03:16:02,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33127 to 32306. [2021-11-23 03:16:02,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32306 states, 24102 states have (on average 1.6174176416894863) internal successors, (38983), 25185 states have internal predecessors, (38983), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-23 03:16:02,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32306 states to 32306 states and 55984 transitions. [2021-11-23 03:16:02,504 INFO L78 Accepts]: Start accepts. Automaton has 32306 states and 55984 transitions. Word has length 174 [2021-11-23 03:16:02,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:02,505 INFO L470 AbstractCegarLoop]: Abstraction has 32306 states and 55984 transitions. [2021-11-23 03:16:02,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 03:16:02,505 INFO L276 IsEmpty]: Start isEmpty. Operand 32306 states and 55984 transitions. [2021-11-23 03:16:02,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-23 03:16:02,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:02,513 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 03:16:02,549 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 03:16:02,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:16:02,729 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:02,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:02,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1670511901, now seen corresponding path program 1 times [2021-11-23 03:16:02,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:02,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777547435] [2021-11-23 03:16:02,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:02,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:02,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:03,419 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 03:16:03,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:03,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777547435] [2021-11-23 03:16:03,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777547435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:16:03,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129871020] [2021-11-23 03:16:03,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:03,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:03,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:03,421 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:03,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:16:03,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:03,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 2146 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:16:03,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:04,161 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 03:16:04,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:16:04,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129871020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:16:04,162 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:16:04,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-23 03:16:04,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710350568] [2021-11-23 03:16:04,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:16:04,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:16:04,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:04,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:16:04,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:16:04,164 INFO L87 Difference]: Start difference. First operand 32306 states and 55984 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-23 03:16:05,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:05,442 INFO L93 Difference]: Finished difference Result 33844 states and 62312 transitions. [2021-11-23 03:16:05,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:16:05,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) Word has length 181 [2021-11-23 03:16:05,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:05,572 INFO L225 Difference]: With dead ends: 33844 [2021-11-23 03:16:05,572 INFO L226 Difference]: Without dead ends: 33758 [2021-11-23 03:16:05,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:16:05,588 INFO L933 BasicCegarLoop]: 583 mSDtfsCounter, 47 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1696 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:05,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 1696 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:16:05,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33758 states. [2021-11-23 03:16:06,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33758 to 32498. [2021-11-23 03:16:06,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32498 states, 24294 states have (on average 1.6125380752449165) internal successors, (39175), 25377 states have internal predecessors, (39175), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-23 03:16:07,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32498 states to 32498 states and 56176 transitions. [2021-11-23 03:16:07,333 INFO L78 Accepts]: Start accepts. Automaton has 32498 states and 56176 transitions. Word has length 181 [2021-11-23 03:16:07,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:07,334 INFO L470 AbstractCegarLoop]: Abstraction has 32498 states and 56176 transitions. [2021-11-23 03:16:07,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-23 03:16:07,334 INFO L276 IsEmpty]: Start isEmpty. Operand 32498 states and 56176 transitions. [2021-11-23 03:16:07,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-23 03:16:07,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:07,345 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 5, 4, 4, 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, 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 03:16:07,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:07,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:16:07,567 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:07,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:07,567 INFO L85 PathProgramCache]: Analyzing trace with hash -1001786897, now seen corresponding path program 1 times [2021-11-23 03:16:07,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:07,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099233610] [2021-11-23 03:16:07,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:07,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:07,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:07,751 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-23 03:16:07,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:07,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099233610] [2021-11-23 03:16:07,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099233610] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:16:07,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194507373] [2021-11-23 03:16:07,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:07,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:07,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:07,754 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:07,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb3e1ee8-687a-459f-922a-fdb8b77a59ee/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:16:08,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:08,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 2935 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:16:08,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:08,925 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-23 03:16:08,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:09,716 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-23 03:16:09,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194507373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:09,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993069717] [2021-11-23 03:16:09,741 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 03:16:09,741 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:16:09,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:16:09,752 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:16:09,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:16:21,882 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 422 for LOIs [2021-11-23 03:16:21,953 INFO L197 IcfgInterpreter]: Interpreting procedure cleanup with input of size 598 for LOIs