./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash c8ebe8fd9a8e0d537f351c5a7c305717ff0a45de7ead6b00d56cae7f5bf422b2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:04:34,649 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:04:34,651 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:04:34,683 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:04:34,683 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:04:34,685 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:04:34,686 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:04:34,688 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:04:34,690 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:04:34,691 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:04:34,692 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:04:34,694 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:04:34,694 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:04:34,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:04:34,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:04:34,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:04:34,700 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:04:34,701 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:04:34,706 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:04:34,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:04:34,716 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:04:34,720 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:04:34,722 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:04:34,725 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:04:34,729 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:04:34,729 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:04:34,733 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:04:34,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:04:34,737 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:04:34,738 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:04:34,740 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:04:34,741 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:04:34,742 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:04:34,744 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:04:34,745 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:04:34,746 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:04:34,747 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:04:34,747 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:04:34,747 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:04:34,748 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:04:34,749 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:04:34,751 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-25 18:04:34,784 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:04:34,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:04:34,785 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:04:34,785 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:04:34,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:04:34,786 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:04:34,786 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:04:34,787 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:04:34,787 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:04:34,787 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:04:34,787 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:04:34,788 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:04:34,788 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:04:34,788 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:04:34,788 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:04:34,788 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:04:34,789 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:04:34,789 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:04:34,790 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:04:34,790 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:04:34,790 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:04:34,790 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:04:34,791 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:04:34,791 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:04:34,791 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:04:34,791 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:04:34,791 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:04:34,792 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:04:34,792 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:04:34,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:04:34,792 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:04:34,793 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:04:34,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:04:34,793 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:04:34,793 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:04:34,793 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:04:34,794 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:04:34,794 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:04:34,794 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_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8ebe8fd9a8e0d537f351c5a7c305717ff0a45de7ead6b00d56cae7f5bf422b2 [2021-11-25 18:04:35,062 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:04:35,091 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:04:35,093 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:04:35,094 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:04:35,094 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:04:35,095 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-25 18:04:35,184 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/data/75449a999/b160c6e8cd994559b235519ae943045e/FLAG675166026 [2021-11-25 18:04:36,404 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:04:36,406 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-25 18:04:36,513 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/data/75449a999/b160c6e8cd994559b235519ae943045e/FLAG675166026 [2021-11-25 18:04:37,011 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/data/75449a999/b160c6e8cd994559b235519ae943045e [2021-11-25 18:04:37,014 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:04:37,015 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:04:37,016 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:04:37,016 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:04:37,022 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:04:37,023 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:04:37" (1/1) ... [2021-11-25 18:04:37,024 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2496f76a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:37, skipping insertion in model container [2021-11-25 18:04:37,024 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:04:37" (1/1) ... [2021-11-25 18:04:37,031 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:04:37,359 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:04:53,316 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_38727c88-3483-46bc-b8a0-e8503461dce3/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-25 18:04:54,006 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:04:54,087 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:04:55,272 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_38727c88-3483-46bc-b8a0-e8503461dce3/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-25 18:04:55,355 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:04:56,577 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:04:56,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56 WrapperNode [2021-11-25 18:04:56,577 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:04:56,578 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:04:56,579 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:04:56,579 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:04:56,593 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,097 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,429 INFO L137 Inliner]: procedures = 1364, calls = 15139, calls flagged for inlining = 461, calls inlined = 24, statements flattened = 6423 [2021-11-25 18:04:57,430 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:04:57,431 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:04:57,431 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:04:57,431 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:04:57,440 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,521 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,757 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,798 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,841 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:04:57,843 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:04:57,845 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:04:57,845 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:04:57,846 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (1/1) ... [2021-11-25 18:04:57,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:04:57,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:04:57,883 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:04:57,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38727c88-3483-46bc-b8a0-e8503461dce3/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:04:57,929 INFO L130 BoogieDeclarations]: Found specification of procedure device_lock___5 [2021-11-25 18:04:57,929 INFO L138 BoogieDeclarations]: Found implementation of procedure device_lock___5 [2021-11-25 18:04:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-25 18:04:57,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-25 18:04:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_dir_in [2021-11-25 18:04:57,930 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_dir_in [2021-11-25 18:04:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_poll [2021-11-25 18:04:57,930 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_poll [2021-11-25 18:04:57,930 INFO L130 BoogieDeclarations]: Found specification of procedure device_unlock___5 [2021-11-25 18:04:57,930 INFO L138 BoogieDeclarations]: Found implementation of procedure device_unlock___5 [2021-11-25 18:04:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_initialize [2021-11-25 18:04:57,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_initialize [2021-11-25 18:04:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:04:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-25 18:04:57,931 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-25 18:04:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure usb_hub_find_child [2021-11-25 18:04:57,931 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_hub_find_child [2021-11-25 18:04:57,931 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_mutex [2021-11-25 18:04:57,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_mutex [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:04:57,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:04:57,932 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-25 18:04:57,932 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-25 18:04:57,933 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-25 18:04:57,933 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-25 18:04:57,933 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-25 18:04:57,933 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-25 18:04:57,933 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:04:57,933 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 18:04:57,933 INFO L130 BoogieDeclarations]: Found specification of procedure hdev_to_hub [2021-11-25 18:04:57,933 INFO L138 BoogieDeclarations]: Found implementation of procedure hdev_to_hub [2021-11-25 18:04:57,934 INFO L130 BoogieDeclarations]: Found specification of procedure __get_free_pages [2021-11-25 18:04:57,934 INFO L138 BoogieDeclarations]: Found implementation of procedure __get_free_pages [2021-11-25 18:04:57,934 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:04:57,934 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-25 18:04:57,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-25 18:04:57,935 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-25 18:04:57,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-25 18:04:57,935 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_return_value [2021-11-25 18:04:57,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_return_value [2021-11-25 18:04:57,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:04:57,935 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-25 18:04:57,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-25 18:04:57,936 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_i_mutex [2021-11-25 18:04:57,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_i_mutex [2021-11-25 18:04:57,936 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_dump [2021-11-25 18:04:57,937 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_dump [2021-11-25 18:04:57,937 INFO L130 BoogieDeclarations]: Found specification of procedure dev_get_drvdata [2021-11-25 18:04:57,937 INFO L138 BoogieDeclarations]: Found implementation of procedure dev_get_drvdata [2021-11-25 18:04:57,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-25 18:04:57,938 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_mutex [2021-11-25 18:04:57,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_mutex [2021-11-25 18:04:57,938 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_intfdata [2021-11-25 18:04:57,938 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_intfdata [2021-11-25 18:04:57,938 INFO L130 BoogieDeclarations]: Found specification of procedure class_decode [2021-11-25 18:04:57,939 INFO L138 BoogieDeclarations]: Found implementation of procedure class_decode [2021-11-25 18:04:57,939 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_maxp [2021-11-25 18:04:57,939 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_maxp [2021-11-25 18:04:57,939 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_read [2021-11-25 18:04:57,939 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_read [2021-11-25 18:04:57,940 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_type [2021-11-25 18:04:57,940 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_type [2021-11-25 18:04:57,940 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 18:04:57,940 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 18:04:57,940 INFO L130 BoogieDeclarations]: Found specification of procedure poll_wait [2021-11-25 18:04:57,940 INFO L138 BoogieDeclarations]: Found implementation of procedure poll_wait [2021-11-25 18:04:57,940 INFO L130 BoogieDeclarations]: Found specification of procedure bus_to_hcd [2021-11-25 18:04:57,940 INFO L138 BoogieDeclarations]: Found implementation of procedure bus_to_hcd [2021-11-25 18:04:57,941 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_i_mutex [2021-11-25 18:04:57,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_i_mutex [2021-11-25 18:04:57,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-25 18:04:57,942 INFO L130 BoogieDeclarations]: Found specification of procedure might_fault [2021-11-25 18:04:57,942 INFO L138 BoogieDeclarations]: Found implementation of procedure might_fault [2021-11-25 18:04:57,942 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_handler_precall [2021-11-25 18:04:57,942 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_handler_precall [2021-11-25 18:04:57,942 INFO L130 BoogieDeclarations]: Found specification of procedure free_pages [2021-11-25 18:04:57,942 INFO L138 BoogieDeclarations]: Found implementation of procedure free_pages [2021-11-25 18:04:57,943 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:04:57,943 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_final_state [2021-11-25 18:04:57,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_final_state [2021-11-25 18:04:58,691 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:04:58,699 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:09:02,401 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:09:03,420 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:09:03,421 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 18:09:03,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:09:03 BoogieIcfgContainer [2021-11-25 18:09:03,424 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:09:03,426 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:09:03,426 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:09:03,429 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:09:03,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:04:37" (1/3) ... [2021-11-25 18:09:03,430 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68313aad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:09:03, skipping insertion in model container [2021-11-25 18:09:03,430 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:04:56" (2/3) ... [2021-11-25 18:09:03,431 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68313aad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:09:03, skipping insertion in model container [2021-11-25 18:09:03,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:09:03" (3/3) ... [2021-11-25 18:09:03,432 INFO L111 eAbstractionObserver]: Analyzing ICFG main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-25 18:09:03,437 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:09:03,438 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:09:03,488 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:09:03,495 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:09:03,495 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:09:03,519 INFO L276 IsEmpty]: Start isEmpty. Operand has 272 states, 168 states have (on average 1.3928571428571428) internal successors, (234), 187 states have internal predecessors, (234), 67 states have call successors, (67), 35 states have call predecessors, (67), 35 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) [2021-11-25 18:09:03,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:09:03,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:03,525 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:03,525 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:03,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:03,531 INFO L85 PathProgramCache]: Analyzing trace with hash 8244193, now seen corresponding path program 1 times [2021-11-25 18:09:03,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:03,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156173188] [2021-11-25 18:09:03,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:03,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:04,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:04,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:04,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:04,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156173188] [2021-11-25 18:09:04,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156173188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:04,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:04,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:04,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588124863] [2021-11-25 18:09:04,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:04,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:04,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:04,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:04,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:04,987 INFO L87 Difference]: Start difference. First operand has 272 states, 168 states have (on average 1.3928571428571428) internal successors, (234), 187 states have internal predecessors, (234), 67 states have call successors, (67), 35 states have call predecessors, (67), 35 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:07,301 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.28s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:09,529 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:09,888 INFO L93 Difference]: Finished difference Result 690 states and 946 transitions. [2021-11-25 18:09:09,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:09,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-25 18:09:09,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:09,906 INFO L225 Difference]: With dead ends: 690 [2021-11-25 18:09:09,906 INFO L226 Difference]: Without dead ends: 418 [2021-11-25 18:09:09,912 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 [2021-11-25 18:09:09,916 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 337 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:09,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 482 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 91 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:09:09,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-11-25 18:09:09,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 413. [2021-11-25 18:09:09,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 267 states have (on average 1.3745318352059925) internal successors, (367), 283 states have internal predecessors, (367), 91 states have call successors, (91), 56 states have call predecessors, (91), 54 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:09,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 534 transitions. [2021-11-25 18:09:09,998 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 534 transitions. Word has length 10 [2021-11-25 18:09:09,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:09,999 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 534 transitions. [2021-11-25 18:09:09,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:10,000 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 534 transitions. [2021-11-25 18:09:10,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:09:10,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:10,001 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:10,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:09:10,002 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:10,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:10,003 INFO L85 PathProgramCache]: Analyzing trace with hash 255201726, now seen corresponding path program 1 times [2021-11-25 18:09:10,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:10,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220480821] [2021-11-25 18:09:10,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:10,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:10,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:10,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:10,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:10,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220480821] [2021-11-25 18:09:10,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220480821] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:10,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:10,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:10,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617166949] [2021-11-25 18:09:10,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:10,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:10,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:10,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:10,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:10,914 INFO L87 Difference]: Start difference. First operand 413 states and 534 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:13,255 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.33s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:15,438 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:15,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:15,788 INFO L93 Difference]: Finished difference Result 420 states and 539 transitions. [2021-11-25 18:09:15,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:15,789 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-25 18:09:15,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:15,794 INFO L225 Difference]: With dead ends: 420 [2021-11-25 18:09:15,794 INFO L226 Difference]: Without dead ends: 417 [2021-11-25 18:09:15,795 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 [2021-11-25 18:09:15,799 INFO L933 BasicCegarLoop]: 318 mSDtfsCounter, 330 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:15,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 477 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:09:15,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-25 18:09:15,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2021-11-25 18:09:15,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 267 states have (on average 1.3707865168539326) internal successors, (366), 282 states have internal predecessors, (366), 90 states have call successors, (90), 56 states have call predecessors, (90), 54 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:15,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 532 transitions. [2021-11-25 18:09:15,839 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 532 transitions. Word has length 11 [2021-11-25 18:09:15,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:15,840 INFO L470 AbstractCegarLoop]: Abstraction has 412 states and 532 transitions. [2021-11-25 18:09:15,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:15,840 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 532 transitions. [2021-11-25 18:09:15,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:09:15,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:15,841 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:15,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:09:15,841 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:15,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:15,842 INFO L85 PathProgramCache]: Analyzing trace with hash -679044476, now seen corresponding path program 1 times [2021-11-25 18:09:15,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:15,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129250149] [2021-11-25 18:09:15,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:15,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:16,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:16,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:16,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:16,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129250149] [2021-11-25 18:09:16,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129250149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:16,695 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:16,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:16,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056274640] [2021-11-25 18:09:16,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:16,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:16,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:16,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:16,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:16,697 INFO L87 Difference]: Start difference. First operand 412 states and 532 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:18,985 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.28s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:21,159 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:21,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:21,503 INFO L93 Difference]: Finished difference Result 419 states and 537 transitions. [2021-11-25 18:09:21,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:21,505 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-25 18:09:21,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:21,508 INFO L225 Difference]: With dead ends: 419 [2021-11-25 18:09:21,509 INFO L226 Difference]: Without dead ends: 416 [2021-11-25 18:09:21,509 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 [2021-11-25 18:09:21,510 INFO L933 BasicCegarLoop]: 316 mSDtfsCounter, 327 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 475 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:21,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [329 Valid, 475 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:09:21,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-25 18:09:21,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-25 18:09:21,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 267 states have (on average 1.3670411985018727) internal successors, (365), 281 states have internal predecessors, (365), 89 states have call successors, (89), 56 states have call predecessors, (89), 54 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:21,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 530 transitions. [2021-11-25 18:09:21,543 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 530 transitions. Word has length 12 [2021-11-25 18:09:21,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:21,543 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 530 transitions. [2021-11-25 18:09:21,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:21,544 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 530 transitions. [2021-11-25 18:09:21,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 18:09:21,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:21,545 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:21,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:09:21,545 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:21,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:21,546 INFO L85 PathProgramCache]: Analyzing trace with hash 424099201, now seen corresponding path program 1 times [2021-11-25 18:09:21,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:21,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086689407] [2021-11-25 18:09:21,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:21,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:21,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:22,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:22,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:22,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086689407] [2021-11-25 18:09:22,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086689407] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:22,316 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:22,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:22,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83330205] [2021-11-25 18:09:22,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:22,317 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:22,317 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:22,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:22,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:22,318 INFO L87 Difference]: Start difference. First operand 411 states and 530 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:24,576 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.25s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:26,765 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:27,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:27,089 INFO L93 Difference]: Finished difference Result 420 states and 536 transitions. [2021-11-25 18:09:27,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:27,090 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-25 18:09:27,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:27,093 INFO L225 Difference]: With dead ends: 420 [2021-11-25 18:09:27,093 INFO L226 Difference]: Without dead ends: 416 [2021-11-25 18:09:27,094 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 [2021-11-25 18:09:27,095 INFO L933 BasicCegarLoop]: 311 mSDtfsCounter, 311 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:27,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 476 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:09:27,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-25 18:09:27,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-25 18:09:27,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 268 states have (on average 1.3582089552238805) internal successors, (364), 280 states have internal predecessors, (364), 87 states have call successors, (87), 57 states have call predecessors, (87), 55 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:27,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 527 transitions. [2021-11-25 18:09:27,123 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 527 transitions. Word has length 13 [2021-11-25 18:09:27,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:27,124 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 527 transitions. [2021-11-25 18:09:27,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:27,124 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 527 transitions. [2021-11-25 18:09:27,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:09:27,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:27,125 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:27,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:09:27,126 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:27,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:27,126 INFO L85 PathProgramCache]: Analyzing trace with hash 261819687, now seen corresponding path program 1 times [2021-11-25 18:09:27,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:27,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181158540] [2021-11-25 18:09:27,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:27,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:27,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:27,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:27,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:27,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181158540] [2021-11-25 18:09:27,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181158540] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:27,861 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:27,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:27,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192638286] [2021-11-25 18:09:27,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:27,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:27,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:27,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:27,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:27,863 INFO L87 Difference]: Start difference. First operand 411 states and 527 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:30,136 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:32,296 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:32,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:32,608 INFO L93 Difference]: Finished difference Result 418 states and 532 transitions. [2021-11-25 18:09:32,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:32,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-25 18:09:32,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:32,612 INFO L225 Difference]: With dead ends: 418 [2021-11-25 18:09:32,613 INFO L226 Difference]: Without dead ends: 415 [2021-11-25 18:09:32,613 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 [2021-11-25 18:09:32,614 INFO L933 BasicCegarLoop]: 310 mSDtfsCounter, 319 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 321 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:32,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [321 Valid, 469 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:09:32,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-11-25 18:09:32,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 410. [2021-11-25 18:09:32,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 268 states have (on average 1.3544776119402986) internal successors, (363), 279 states have internal predecessors, (363), 86 states have call successors, (86), 57 states have call predecessors, (86), 55 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:32,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 525 transitions. [2021-11-25 18:09:32,641 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 525 transitions. Word has length 14 [2021-11-25 18:09:32,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:32,642 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 525 transitions. [2021-11-25 18:09:32,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:32,642 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 525 transitions. [2021-11-25 18:09:32,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:09:32,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:32,643 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:32,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:09:32,644 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:32,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:32,645 INFO L85 PathProgramCache]: Analyzing trace with hash -473873084, now seen corresponding path program 1 times [2021-11-25 18:09:32,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:32,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735325655] [2021-11-25 18:09:32,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:32,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:32,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:33,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:33,334 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:33,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735325655] [2021-11-25 18:09:33,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735325655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:33,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:33,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:33,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671813926] [2021-11-25 18:09:33,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:33,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:33,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:33,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:33,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:33,341 INFO L87 Difference]: Start difference. First operand 410 states and 525 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:35,649 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.30s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:37,807 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:38,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:38,106 INFO L93 Difference]: Finished difference Result 417 states and 530 transitions. [2021-11-25 18:09:38,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:38,107 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-25 18:09:38,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:38,110 INFO L225 Difference]: With dead ends: 417 [2021-11-25 18:09:38,110 INFO L226 Difference]: Without dead ends: 414 [2021-11-25 18:09:38,111 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 [2021-11-25 18:09:38,111 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 316 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:38,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 467 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:09:38,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-11-25 18:09:38,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 409. [2021-11-25 18:09:38,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 268 states have (on average 1.3507462686567164) internal successors, (362), 278 states have internal predecessors, (362), 85 states have call successors, (85), 57 states have call predecessors, (85), 55 states have return successors, (76), 74 states have call predecessors, (76), 74 states have call successors, (76) [2021-11-25 18:09:38,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 523 transitions. [2021-11-25 18:09:38,138 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 523 transitions. Word has length 15 [2021-11-25 18:09:38,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:38,139 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 523 transitions. [2021-11-25 18:09:38,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:38,139 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 523 transitions. [2021-11-25 18:09:38,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 18:09:38,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:38,145 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:38,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:09:38,146 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:38,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:38,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1805507638, now seen corresponding path program 1 times [2021-11-25 18:09:38,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:38,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236871736] [2021-11-25 18:09:38,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:38,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:38,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:38,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:38,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:38,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236871736] [2021-11-25 18:09:38,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236871736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:38,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:38,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:38,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124229380] [2021-11-25 18:09:38,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:38,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:38,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:38,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:38,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:38,879 INFO L87 Difference]: Start difference. First operand 409 states and 523 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:41,300 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.42s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:43,477 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:43,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:43,743 INFO L93 Difference]: Finished difference Result 910 states and 1165 transitions. [2021-11-25 18:09:43,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:43,743 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-11-25 18:09:43,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:43,747 INFO L225 Difference]: With dead ends: 910 [2021-11-25 18:09:43,747 INFO L226 Difference]: Without dead ends: 505 [2021-11-25 18:09:43,749 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 [2021-11-25 18:09:43,750 INFO L933 BasicCegarLoop]: 317 mSDtfsCounter, 179 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:43,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 474 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 97 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:09:43,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-25 18:09:43,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 496. [2021-11-25 18:09:43,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 322 states have (on average 1.313664596273292) internal successors, (423), 332 states have internal predecessors, (423), 103 states have call successors, (103), 76 states have call predecessors, (103), 70 states have return successors, (97), 88 states have call predecessors, (97), 90 states have call successors, (97) [2021-11-25 18:09:43,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 623 transitions. [2021-11-25 18:09:43,781 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 623 transitions. Word has length 16 [2021-11-25 18:09:43,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:43,782 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 623 transitions. [2021-11-25 18:09:43,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:43,782 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 623 transitions. [2021-11-25 18:09:43,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 18:09:43,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:43,783 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:43,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:09:43,784 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:43,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:43,784 INFO L85 PathProgramCache]: Analyzing trace with hash -136500985, now seen corresponding path program 1 times [2021-11-25 18:09:43,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:43,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655349162] [2021-11-25 18:09:43,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:43,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:44,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:44,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:44,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:44,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655349162] [2021-11-25 18:09:44,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655349162] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:44,376 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:44,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:44,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803112006] [2021-11-25 18:09:44,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:44,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:44,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:44,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:44,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:44,377 INFO L87 Difference]: Start difference. First operand 496 states and 623 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:46,638 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.26s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:48,775 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:49,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:49,129 INFO L93 Difference]: Finished difference Result 509 states and 634 transitions. [2021-11-25 18:09:49,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:49,130 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-25 18:09:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:49,134 INFO L225 Difference]: With dead ends: 509 [2021-11-25 18:09:49,134 INFO L226 Difference]: Without dead ends: 506 [2021-11-25 18:09:49,134 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 [2021-11-25 18:09:49,135 INFO L933 BasicCegarLoop]: 305 mSDtfsCounter, 310 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:49,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 464 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:09:49,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-25 18:09:49,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 495. [2021-11-25 18:09:49,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 495 states, 322 states have (on average 1.31055900621118) internal successors, (422), 331 states have internal predecessors, (422), 102 states have call successors, (102), 76 states have call predecessors, (102), 70 states have return successors, (97), 88 states have call predecessors, (97), 90 states have call successors, (97) [2021-11-25 18:09:49,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 621 transitions. [2021-11-25 18:09:49,164 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 621 transitions. Word has length 17 [2021-11-25 18:09:49,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:49,165 INFO L470 AbstractCegarLoop]: Abstraction has 495 states and 621 transitions. [2021-11-25 18:09:49,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:49,165 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 621 transitions. [2021-11-25 18:09:49,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 18:09:49,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:49,166 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:49,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:09:49,166 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:49,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:49,167 INFO L85 PathProgramCache]: Analyzing trace with hash 63102573, now seen corresponding path program 1 times [2021-11-25 18:09:49,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:49,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592535342] [2021-11-25 18:09:49,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:49,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:49,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:49,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:49,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:49,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592535342] [2021-11-25 18:09:49,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592535342] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:49,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:49,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:49,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836659014] [2021-11-25 18:09:49,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:49,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:49,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:49,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:49,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:49,693 INFO L87 Difference]: Start difference. First operand 495 states and 621 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:52,015 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:54,162 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:54,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:54,481 INFO L93 Difference]: Finished difference Result 508 states and 632 transitions. [2021-11-25 18:09:54,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:54,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-11-25 18:09:54,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:54,486 INFO L225 Difference]: With dead ends: 508 [2021-11-25 18:09:54,486 INFO L226 Difference]: Without dead ends: 505 [2021-11-25 18:09:54,486 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 [2021-11-25 18:09:54,487 INFO L933 BasicCegarLoop]: 303 mSDtfsCounter, 307 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:54,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [309 Valid, 462 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:09:54,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-25 18:09:54,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 494. [2021-11-25 18:09:54,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 322 states have (on average 1.3074534161490683) internal successors, (421), 330 states have internal predecessors, (421), 101 states have call successors, (101), 76 states have call predecessors, (101), 70 states have return successors, (97), 88 states have call predecessors, (97), 90 states have call successors, (97) [2021-11-25 18:09:54,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 619 transitions. [2021-11-25 18:09:54,516 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 619 transitions. Word has length 18 [2021-11-25 18:09:54,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:54,516 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 619 transitions. [2021-11-25 18:09:54,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:54,517 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 619 transitions. [2021-11-25 18:09:54,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 18:09:54,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:54,518 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:54,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:09:54,518 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:54,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:54,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1955850442, now seen corresponding path program 1 times [2021-11-25 18:09:54,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:54,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277604579] [2021-11-25 18:09:54,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:54,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:54,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:55,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:55,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:55,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277604579] [2021-11-25 18:09:55,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277604579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:55,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:55,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:09:55,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828272640] [2021-11-25 18:09:55,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:55,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:09:55,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:55,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:09:55,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:09:55,109 INFO L87 Difference]: Start difference. First operand 494 states and 619 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:57,425 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.31s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:59,616 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:09:59,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:59,854 INFO L93 Difference]: Finished difference Result 500 states and 622 transitions. [2021-11-25 18:09:59,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:09:59,855 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-25 18:09:59,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:59,858 INFO L225 Difference]: With dead ends: 500 [2021-11-25 18:09:59,858 INFO L226 Difference]: Without dead ends: 496 [2021-11-25 18:09:59,859 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 [2021-11-25 18:09:59,860 INFO L933 BasicCegarLoop]: 266 mSDtfsCounter, 82 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:59,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 452 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:09:59,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-11-25 18:09:59,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 494. [2021-11-25 18:09:59,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 323 states have (on average 1.3003095975232197) internal successors, (420), 329 states have internal predecessors, (420), 99 states have call successors, (99), 77 states have call predecessors, (99), 71 states have return successors, (97), 88 states have call predecessors, (97), 90 states have call successors, (97) [2021-11-25 18:09:59,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 616 transitions. [2021-11-25 18:09:59,888 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 616 transitions. Word has length 19 [2021-11-25 18:09:59,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:59,889 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 616 transitions. [2021-11-25 18:09:59,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:09:59,889 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 616 transitions. [2021-11-25 18:09:59,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 18:09:59,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:59,890 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] [2021-11-25 18:09:59,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 18:09:59,890 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:59,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:59,891 INFO L85 PathProgramCache]: Analyzing trace with hash 501497104, now seen corresponding path program 1 times [2021-11-25 18:09:59,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:59,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383281168] [2021-11-25 18:09:59,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:59,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:00,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:00,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:00,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:00,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383281168] [2021-11-25 18:10:00,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383281168] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:00,406 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:00,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:10:00,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922940498] [2021-11-25 18:10:00,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:00,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:10:00,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:00,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:10:00,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:00,408 INFO L87 Difference]: Start difference. First operand 494 states and 616 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:10:02,638 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.22s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:04,769 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:05,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:05,095 INFO L93 Difference]: Finished difference Result 507 states and 627 transitions. [2021-11-25 18:10:05,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:10:05,096 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-25 18:10:05,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:05,098 INFO L225 Difference]: With dead ends: 507 [2021-11-25 18:10:05,099 INFO L226 Difference]: Without dead ends: 492 [2021-11-25 18:10:05,099 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 [2021-11-25 18:10:05,100 INFO L933 BasicCegarLoop]: 298 mSDtfsCounter, 299 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:05,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 457 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 89 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:10:05,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-25 18:10:05,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 481. [2021-11-25 18:10:05,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 312 states have (on average 1.3044871794871795) internal successors, (407), 317 states have internal predecessors, (407), 97 states have call successors, (97), 76 states have call predecessors, (97), 71 states have return successors, (97), 88 states have call predecessors, (97), 90 states have call successors, (97) [2021-11-25 18:10:05,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 601 transitions. [2021-11-25 18:10:05,135 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 601 transitions. Word has length 20 [2021-11-25 18:10:05,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:05,136 INFO L470 AbstractCegarLoop]: Abstraction has 481 states and 601 transitions. [2021-11-25 18:10:05,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:10:05,136 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 601 transitions. [2021-11-25 18:10:05,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:10:05,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:05,137 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] [2021-11-25 18:10:05,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 18:10:05,137 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:05,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:05,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1248122496, now seen corresponding path program 1 times [2021-11-25 18:10:05,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:05,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128827231] [2021-11-25 18:10:05,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:05,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:05,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:05,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:05,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:05,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128827231] [2021-11-25 18:10:05,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128827231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:05,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:05,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:10:05,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156986796] [2021-11-25 18:10:05,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:05,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:10:05,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:05,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:10:05,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:05,843 INFO L87 Difference]: Start difference. First operand 481 states and 601 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:10:08,162 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.31s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:10,365 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:10,612 INFO L93 Difference]: Finished difference Result 968 states and 1215 transitions. [2021-11-25 18:10:10,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:10:10,613 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2021-11-25 18:10:10,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:10,616 INFO L225 Difference]: With dead ends: 968 [2021-11-25 18:10:10,616 INFO L226 Difference]: Without dead ends: 491 [2021-11-25 18:10:10,618 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 [2021-11-25 18:10:10,619 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 30 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:10,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 466 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 109 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:10:10,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-11-25 18:10:10,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 491. [2021-11-25 18:10:10,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 320 states have (on average 1.30625) internal successors, (418), 325 states have internal predecessors, (418), 99 states have call successors, (99), 76 states have call predecessors, (99), 71 states have return successors, (99), 90 states have call predecessors, (99), 92 states have call successors, (99) [2021-11-25 18:10:10,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 616 transitions. [2021-11-25 18:10:10,648 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 616 transitions. Word has length 27 [2021-11-25 18:10:10,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:10,648 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 616 transitions. [2021-11-25 18:10:10,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:10:10,649 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 616 transitions. [2021-11-25 18:10:10,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:10:10,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:10,650 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] [2021-11-25 18:10:10,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 18:10:10,650 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:10,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:10,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1532540731, now seen corresponding path program 1 times [2021-11-25 18:10:10,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:10,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748873597] [2021-11-25 18:10:10,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:10,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:11,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:11,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:11,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:11,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748873597] [2021-11-25 18:10:11,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748873597] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:11,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:11,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:10:11,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614361386] [2021-11-25 18:10:11,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:11,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:10:11,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:11,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:10:11,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:11,509 INFO L87 Difference]: Start difference. First operand 491 states and 616 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:10:13,835 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:15,966 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:16,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:16,270 INFO L93 Difference]: Finished difference Result 504 states and 627 transitions. [2021-11-25 18:10:16,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:10:16,270 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-11-25 18:10:16,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:16,274 INFO L225 Difference]: With dead ends: 504 [2021-11-25 18:10:16,274 INFO L226 Difference]: Without dead ends: 501 [2021-11-25 18:10:16,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:16,275 INFO L933 BasicCegarLoop]: 282 mSDtfsCounter, 213 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:16,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 505 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:10:16,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-25 18:10:16,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 490. [2021-11-25 18:10:16,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 320 states have (on average 1.303125) internal successors, (417), 324 states have internal predecessors, (417), 98 states have call successors, (98), 76 states have call predecessors, (98), 71 states have return successors, (99), 90 states have call predecessors, (99), 92 states have call successors, (99) [2021-11-25 18:10:16,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 614 transitions. [2021-11-25 18:10:16,305 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 614 transitions. Word has length 34 [2021-11-25 18:10:16,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:16,306 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 614 transitions. [2021-11-25 18:10:16,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:10:16,306 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 614 transitions. [2021-11-25 18:10:16,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 18:10:16,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:16,308 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:10:16,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 18:10:16,308 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:16,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:16,309 INFO L85 PathProgramCache]: Analyzing trace with hash 759579910, now seen corresponding path program 1 times [2021-11-25 18:10:16,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:16,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56624042] [2021-11-25 18:10:16,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:16,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:16,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:17,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:10:17,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:17,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56624042] [2021-11-25 18:10:17,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56624042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:17,027 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:17,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:10:17,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429131988] [2021-11-25 18:10:17,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:17,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:10:17,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:17,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:10:17,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:10:17,030 INFO L87 Difference]: Start difference. First operand 490 states and 614 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:10:19,359 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:21,563 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:21,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:21,824 INFO L93 Difference]: Finished difference Result 979 states and 1228 transitions. [2021-11-25 18:10:21,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:10:21,825 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-11-25 18:10:21,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:21,829 INFO L225 Difference]: With dead ends: 979 [2021-11-25 18:10:21,829 INFO L226 Difference]: Without dead ends: 490 [2021-11-25 18:10:21,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:10:21,832 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 1 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 744 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:21,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 744 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 165 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:10:21,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-11-25 18:10:21,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2021-11-25 18:10:21,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 320 states have (on average 1.3) internal successors, (416), 324 states have internal predecessors, (416), 98 states have call successors, (98), 76 states have call predecessors, (98), 71 states have return successors, (99), 90 states have call predecessors, (99), 92 states have call successors, (99) [2021-11-25 18:10:21,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 613 transitions. [2021-11-25 18:10:21,862 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 613 transitions. Word has length 41 [2021-11-25 18:10:21,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:21,863 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 613 transitions. [2021-11-25 18:10:21,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:10:21,863 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 613 transitions. [2021-11-25 18:10:21,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 18:10:21,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:21,864 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:10:21,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 18:10:21,865 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:21,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:21,865 INFO L85 PathProgramCache]: Analyzing trace with hash -2110849133, now seen corresponding path program 1 times [2021-11-25 18:10:21,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:21,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330826470] [2021-11-25 18:10:21,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:21,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:22,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:22,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:10:22,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:22,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330826470] [2021-11-25 18:10:22,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330826470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:22,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:22,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:10:22,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027240452] [2021-11-25 18:10:22,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:22,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:10:22,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:22,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:10:22,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:22,558 INFO L87 Difference]: Start difference. First operand 490 states and 613 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 18:10:24,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:27,029 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:27,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:27,271 INFO L93 Difference]: Finished difference Result 492 states and 614 transitions. [2021-11-25 18:10:27,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:10:27,271 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 42 [2021-11-25 18:10:27,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:27,274 INFO L225 Difference]: With dead ends: 492 [2021-11-25 18:10:27,274 INFO L226 Difference]: Without dead ends: 489 [2021-11-25 18:10:27,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:10:27,275 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 3 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:27,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 488 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 18:10:27,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-25 18:10:27,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 489. [2021-11-25 18:10:27,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 320 states have (on average 1.296875) internal successors, (415), 323 states have internal predecessors, (415), 97 states have call successors, (97), 76 states have call predecessors, (97), 71 states have return successors, (99), 90 states have call predecessors, (99), 92 states have call successors, (99) [2021-11-25 18:10:27,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 611 transitions. [2021-11-25 18:10:27,320 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 611 transitions. Word has length 42 [2021-11-25 18:10:27,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:27,323 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 611 transitions. [2021-11-25 18:10:27,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 18:10:27,323 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 611 transitions. [2021-11-25 18:10:27,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:10:27,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:27,325 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:27,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 18:10:27,325 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:27,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:27,326 INFO L85 PathProgramCache]: Analyzing trace with hash -823142469, now seen corresponding path program 1 times [2021-11-25 18:10:27,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:27,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521145741] [2021-11-25 18:10:27,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:27,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:27,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:28,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:10:28,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:28,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521145741] [2021-11-25 18:10:28,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521145741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:28,115 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:28,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:10:28,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663666259] [2021-11-25 18:10:28,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:28,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:10:28,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:28,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:10:28,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:10:28,117 INFO L87 Difference]: Start difference. First operand 489 states and 611 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 3 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:10:30,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:32,784 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:10:33,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:33,314 INFO L93 Difference]: Finished difference Result 962 states and 1210 transitions. [2021-11-25 18:10:33,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:10:33,315 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 3 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 60 [2021-11-25 18:10:33,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:33,318 INFO L225 Difference]: With dead ends: 962 [2021-11-25 18:10:33,318 INFO L226 Difference]: Without dead ends: 575 [2021-11-25 18:10:33,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:10:33,319 INFO L933 BasicCegarLoop]: 238 mSDtfsCounter, 317 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 131 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:33,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 484 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 274 Invalid, 2 Unknown, 0 Unchecked, 5.1s Time] [2021-11-25 18:10:33,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-25 18:10:33,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 566. [2021-11-25 18:10:33,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 566 states, 379 states have (on average 1.3087071240105541) internal successors, (496), 380 states have internal predecessors, (496), 108 states have call successors, (108), 87 states have call predecessors, (108), 78 states have return successors, (105), 99 states have call predecessors, (105), 101 states have call successors, (105) [2021-11-25 18:10:33,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 566 states to 566 states and 709 transitions. [2021-11-25 18:10:33,351 INFO L78 Accepts]: Start accepts. Automaton has 566 states and 709 transitions. Word has length 60 [2021-11-25 18:10:33,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:33,351 INFO L470 AbstractCegarLoop]: Abstraction has 566 states and 709 transitions. [2021-11-25 18:10:33,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 3 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:10:33,352 INFO L276 IsEmpty]: Start isEmpty. Operand 566 states and 709 transitions. [2021-11-25 18:10:33,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 18:10:33,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:33,355 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:10:33,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-25 18:10:33,356 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:33,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:33,357 INFO L85 PathProgramCache]: Analyzing trace with hash 179758317, now seen corresponding path program 1 times [2021-11-25 18:10:33,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:33,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824456293] [2021-11-25 18:10:33,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:33,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:11:52,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 18:11:52,565 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.