./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 aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/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_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash c8ebe8fd9a8e0d537f351c5a7c305717ff0a45de7ead6b00d56cae7f5bf422b2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:55:04,026 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:55:04,029 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:55:04,083 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:55:04,084 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:55:04,088 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:55:04,090 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:55:04,094 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:55:04,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:55:04,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:55:04,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:55:04,106 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:55:04,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:55:04,109 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:55:04,111 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:55:04,116 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:55:04,117 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:55:04,119 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:55:04,121 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:55:04,129 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:55:04,131 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:55:04,132 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:55:04,135 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:55:04,137 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:55:04,146 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:55:04,146 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:55:04,147 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:55:04,148 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:55:04,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:55:04,151 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:55:04,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:55:04,152 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:55:04,154 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:55:04,156 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:55:04,157 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:55:04,158 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:55:04,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:55:04,159 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:55:04,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:55:04,160 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:55:04,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:55:04,161 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-23 01:55:04,206 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:55:04,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:55:04,207 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:55:04,207 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:55:04,214 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:55:04,215 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:55:04,215 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:55:04,215 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:55:04,215 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:55:04,216 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:55:04,217 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:55:04,217 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:55:04,217 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:55:04,217 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:55:04,218 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:55:04,218 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:55:04,218 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:55:04,218 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:55:04,219 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:55:04,220 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:55:04,220 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:55:04,220 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 01:55:04,220 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:55:04,221 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 01:55:04,221 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 01:55:04,221 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:55:04,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 01:55:04,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:55:04,223 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:55:04,223 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:55:04,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:55:04,224 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:55:04,224 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 01:55:04,225 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:55:04,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:55:04,225 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 01:55:04,225 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:55:04,225 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:55:04,226 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_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8ebe8fd9a8e0d537f351c5a7c305717ff0a45de7ead6b00d56cae7f5bf422b2 [2021-11-23 01:55:04,577 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:55:04,613 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:55:04,616 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:55:04,617 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:55:04,618 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:55:04,620 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-23 01:55:04,711 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/data/8dcff3419/9629ab9b99bb4fa3966fa8381dc9b311/FLAGa5c6de448 [2021-11-23 01:55:06,049 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:55:06,050 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-23 01:55:06,247 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/data/8dcff3419/9629ab9b99bb4fa3966fa8381dc9b311/FLAGa5c6de448 [2021-11-23 01:55:06,542 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/data/8dcff3419/9629ab9b99bb4fa3966fa8381dc9b311 [2021-11-23 01:55:06,544 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:55:06,546 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:55:06,550 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:55:06,550 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:55:06,554 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:55:06,556 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:55:06" (1/1) ... [2021-11-23 01:55:06,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2456a707 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:06, skipping insertion in model container [2021-11-23 01:55:06,558 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:55:06" (1/1) ... [2021-11-23 01:55:06,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:55:06,983 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:55:22,475 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_7f756691-e16c-4650-ae75-1fc45f91d6db/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-23 01:55:23,134 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:55:23,212 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:55:24,770 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_7f756691-e16c-4650-ae75-1fc45f91d6db/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-23 01:55:24,825 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:55:25,806 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:55:25,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25 WrapperNode [2021-11-23 01:55:25,807 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:55:25,808 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:55:25,808 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:55:25,808 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:55:25,816 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,160 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,498 INFO L137 Inliner]: procedures = 1364, calls = 15139, calls flagged for inlining = 461, calls inlined = 24, statements flattened = 6423 [2021-11-23 01:55:26,499 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:55:26,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:55:26,501 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:55:26,501 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:55:26,510 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,511 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,558 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,559 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,701 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,724 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,770 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:55:26,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:55:26,814 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:55:26,815 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:55:26,816 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (1/1) ... [2021-11-23 01:55:26,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:55:26,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:55:26,857 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:55:26,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f756691-e16c-4650-ae75-1fc45f91d6db/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:55:26,921 INFO L130 BoogieDeclarations]: Found specification of procedure device_lock___5 [2021-11-23 01:55:26,921 INFO L138 BoogieDeclarations]: Found implementation of procedure device_lock___5 [2021-11-23 01:55:26,922 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-23 01:55:26,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-23 01:55:26,922 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_dir_in [2021-11-23 01:55:26,922 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_dir_in [2021-11-23 01:55:26,922 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_poll [2021-11-23 01:55:26,922 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_poll [2021-11-23 01:55:26,922 INFO L130 BoogieDeclarations]: Found specification of procedure device_unlock___5 [2021-11-23 01:55:26,923 INFO L138 BoogieDeclarations]: Found implementation of procedure device_unlock___5 [2021-11-23 01:55:26,923 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_initialize [2021-11-23 01:55:26,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_initialize [2021-11-23 01:55:26,923 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 01:55:26,923 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-23 01:55:26,923 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-23 01:55:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure usb_hub_find_child [2021-11-23 01:55:26,924 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_hub_find_child [2021-11-23 01:55:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 01:55:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 01:55:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 01:55:26,924 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-23 01:55:26,925 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_mutex [2021-11-23 01:55:26,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_mutex [2021-11-23 01:55:26,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:55:26,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:55:26,925 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-23 01:55:26,925 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-23 01:55:26,926 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-23 01:55:26,926 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-23 01:55:26,926 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-23 01:55:26,926 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-23 01:55:26,927 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 01:55:26,927 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 01:55:26,927 INFO L130 BoogieDeclarations]: Found specification of procedure hdev_to_hub [2021-11-23 01:55:26,927 INFO L138 BoogieDeclarations]: Found implementation of procedure hdev_to_hub [2021-11-23 01:55:26,927 INFO L130 BoogieDeclarations]: Found specification of procedure __get_free_pages [2021-11-23 01:55:26,928 INFO L138 BoogieDeclarations]: Found implementation of procedure __get_free_pages [2021-11-23 01:55:26,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 01:55:26,928 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-23 01:55:26,928 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-23 01:55:26,928 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-23 01:55:26,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-23 01:55:26,929 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_return_value [2021-11-23 01:55:26,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_return_value [2021-11-23 01:55:26,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 01:55:26,929 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-23 01:55:26,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-23 01:55:26,930 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_i_mutex [2021-11-23 01:55:26,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_i_mutex [2021-11-23 01:55:26,931 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_dump [2021-11-23 01:55:26,931 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_dump [2021-11-23 01:55:26,931 INFO L130 BoogieDeclarations]: Found specification of procedure dev_get_drvdata [2021-11-23 01:55:26,932 INFO L138 BoogieDeclarations]: Found implementation of procedure dev_get_drvdata [2021-11-23 01:55:26,932 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-23 01:55:26,932 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_mutex [2021-11-23 01:55:26,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_mutex [2021-11-23 01:55:26,932 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_intfdata [2021-11-23 01:55:26,932 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_intfdata [2021-11-23 01:55:26,933 INFO L130 BoogieDeclarations]: Found specification of procedure class_decode [2021-11-23 01:55:26,933 INFO L138 BoogieDeclarations]: Found implementation of procedure class_decode [2021-11-23 01:55:26,933 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_maxp [2021-11-23 01:55:26,934 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_maxp [2021-11-23 01:55:26,934 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_read [2021-11-23 01:55:26,934 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_read [2021-11-23 01:55:26,934 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_type [2021-11-23 01:55:26,934 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_type [2021-11-23 01:55:26,934 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 01:55:26,935 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 01:55:26,935 INFO L130 BoogieDeclarations]: Found specification of procedure poll_wait [2021-11-23 01:55:26,935 INFO L138 BoogieDeclarations]: Found implementation of procedure poll_wait [2021-11-23 01:55:26,935 INFO L130 BoogieDeclarations]: Found specification of procedure bus_to_hcd [2021-11-23 01:55:26,935 INFO L138 BoogieDeclarations]: Found implementation of procedure bus_to_hcd [2021-11-23 01:55:26,935 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_i_mutex [2021-11-23 01:55:26,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_i_mutex [2021-11-23 01:55:26,936 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 01:55:26,937 INFO L130 BoogieDeclarations]: Found specification of procedure might_fault [2021-11-23 01:55:26,937 INFO L138 BoogieDeclarations]: Found implementation of procedure might_fault [2021-11-23 01:55:26,937 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_handler_precall [2021-11-23 01:55:26,937 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_handler_precall [2021-11-23 01:55:26,937 INFO L130 BoogieDeclarations]: Found specification of procedure free_pages [2021-11-23 01:55:26,937 INFO L138 BoogieDeclarations]: Found implementation of procedure free_pages [2021-11-23 01:55:26,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 01:55:26,938 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_final_state [2021-11-23 01:55:26,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_final_state [2021-11-23 01:55:27,572 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:55:27,576 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:59:54,233 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:59:55,740 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:59:55,741 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 01:59:55,749 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:59:55 BoogieIcfgContainer [2021-11-23 01:59:55,749 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:59:55,751 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:59:55,752 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:59:55,756 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:59:55,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:55:06" (1/3) ... [2021-11-23 01:59:55,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d098ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:59:55, skipping insertion in model container [2021-11-23 01:59:55,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:55:25" (2/3) ... [2021-11-23 01:59:55,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d098ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:59:55, skipping insertion in model container [2021-11-23 01:59:55,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:59:55" (3/3) ... [2021-11-23 01:59:55,761 INFO L111 eAbstractionObserver]: Analyzing ICFG main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-23 01:59:55,768 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:59:55,768 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 01:59:55,848 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:59:55,859 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 01:59:55,860 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 01:59:55,901 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) [2021-11-23 01:59:55,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 01:59:55,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:59:55,908 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:59:55,909 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:59:55,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:59:55,917 INFO L85 PathProgramCache]: Analyzing trace with hash 8244193, now seen corresponding path program 1 times [2021-11-23 01:59:55,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:59:55,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134334257] [2021-11-23 01:59:55,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:59:55,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:59:56,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:59:57,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:59:57,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:59:57,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134334257] [2021-11-23 01:59:57,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134334257] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:59:57,471 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:59:57,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 01:59:57,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645572806] [2021-11-23 01:59:57,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:59:57,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:59:57,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:59:57,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:59:57,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:59:57,519 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) [2021-11-23 01:59:59,905 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.35s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:02,184 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:02,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:02,556 INFO L93 Difference]: Finished difference Result 690 states and 946 transitions. [2021-11-23 02:00:02,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:02,564 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 [2021-11-23 02:00:02,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:02,587 INFO L225 Difference]: With dead ends: 690 [2021-11-23 02:00:02,587 INFO L226 Difference]: Without dead ends: 418 [2021-11-23 02:00:02,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:02,608 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 337 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:02,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 482 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 91 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:00:02,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-11-23 02:00:02,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 413. [2021-11-23 02:00:02,722 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) [2021-11-23 02:00:02,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 534 transitions. [2021-11-23 02:00:02,730 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 534 transitions. Word has length 10 [2021-11-23 02:00:02,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:02,731 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 534 transitions. [2021-11-23 02:00:02,731 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) [2021-11-23 02:00:02,732 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 534 transitions. [2021-11-23 02:00:02,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:00:02,733 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:02,733 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:02,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:00:02,734 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:02,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:02,735 INFO L85 PathProgramCache]: Analyzing trace with hash 255201726, now seen corresponding path program 1 times [2021-11-23 02:00:02,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:02,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890273807] [2021-11-23 02:00:02,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:02,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:03,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:03,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:03,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:03,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890273807] [2021-11-23 02:00:03,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1890273807] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:03,687 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:03,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:03,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653384265] [2021-11-23 02:00:03,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:03,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:03,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:03,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:03,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:03,691 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) [2021-11-23 02:00:06,057 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.35s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:08,302 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:08,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:08,625 INFO L93 Difference]: Finished difference Result 420 states and 539 transitions. [2021-11-23 02:00:08,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:08,626 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 [2021-11-23 02:00:08,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:08,631 INFO L225 Difference]: With dead ends: 420 [2021-11-23 02:00:08,631 INFO L226 Difference]: Without dead ends: 417 [2021-11-23 02:00:08,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:08,633 INFO L933 BasicCegarLoop]: 318 mSDtfsCounter, 330 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:08,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 477 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:00:08,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-23 02:00:08,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2021-11-23 02:00:08,673 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) [2021-11-23 02:00:08,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 532 transitions. [2021-11-23 02:00:08,679 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 532 transitions. Word has length 11 [2021-11-23 02:00:08,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:08,679 INFO L470 AbstractCegarLoop]: Abstraction has 412 states and 532 transitions. [2021-11-23 02:00:08,679 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) [2021-11-23 02:00:08,680 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 532 transitions. [2021-11-23 02:00:08,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:00:08,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:08,681 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:08,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:00:08,681 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:08,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:08,682 INFO L85 PathProgramCache]: Analyzing trace with hash -679044476, now seen corresponding path program 1 times [2021-11-23 02:00:08,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:08,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128593983] [2021-11-23 02:00:08,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:08,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:09,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:09,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:09,482 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:09,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128593983] [2021-11-23 02:00:09,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128593983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:09,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:09,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:09,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808321577] [2021-11-23 02:00:09,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:09,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:09,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:09,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:09,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:09,486 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) [2021-11-23 02:00:11,856 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.36s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:14,052 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:14,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:14,408 INFO L93 Difference]: Finished difference Result 419 states and 537 transitions. [2021-11-23 02:00:14,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:14,409 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 [2021-11-23 02:00:14,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:14,414 INFO L225 Difference]: With dead ends: 419 [2021-11-23 02:00:14,414 INFO L226 Difference]: Without dead ends: 416 [2021-11-23 02:00:14,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:14,416 INFO L933 BasicCegarLoop]: 316 mSDtfsCounter, 327 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:14,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [329 Valid, 475 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:00:14,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-23 02:00:14,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-23 02:00:14,448 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) [2021-11-23 02:00:14,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 530 transitions. [2021-11-23 02:00:14,453 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 530 transitions. Word has length 12 [2021-11-23 02:00:14,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:14,454 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 530 transitions. [2021-11-23 02:00:14,454 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) [2021-11-23 02:00:14,455 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 530 transitions. [2021-11-23 02:00:14,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 02:00:14,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:14,456 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:14,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:00:14,456 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:14,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:14,457 INFO L85 PathProgramCache]: Analyzing trace with hash 424099201, now seen corresponding path program 1 times [2021-11-23 02:00:14,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:14,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683084606] [2021-11-23 02:00:14,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:14,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:14,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:15,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:15,205 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:15,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683084606] [2021-11-23 02:00:15,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683084606] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:15,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:15,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:15,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54884607] [2021-11-23 02:00:15,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:15,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:15,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:15,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:15,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:15,210 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) [2021-11-23 02:00:17,505 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.29s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:19,723 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:20,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:20,040 INFO L93 Difference]: Finished difference Result 420 states and 536 transitions. [2021-11-23 02:00:20,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:20,041 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 [2021-11-23 02:00:20,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:20,045 INFO L225 Difference]: With dead ends: 420 [2021-11-23 02:00:20,045 INFO L226 Difference]: Without dead ends: 416 [2021-11-23 02:00:20,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:20,049 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:20,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 476 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:00:20,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-23 02:00:20,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-23 02:00:20,087 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) [2021-11-23 02:00:20,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 527 transitions. [2021-11-23 02:00:20,092 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 527 transitions. Word has length 13 [2021-11-23 02:00:20,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:20,092 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 527 transitions. [2021-11-23 02:00:20,093 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) [2021-11-23 02:00:20,093 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 527 transitions. [2021-11-23 02:00:20,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:00:20,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:20,095 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:20,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:00:20,095 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:20,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:20,098 INFO L85 PathProgramCache]: Analyzing trace with hash 261819687, now seen corresponding path program 1 times [2021-11-23 02:00:20,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:20,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058504134] [2021-11-23 02:00:20,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:20,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:20,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:20,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:20,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:20,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058504134] [2021-11-23 02:00:20,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058504134] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:20,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:20,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:20,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944195697] [2021-11-23 02:00:20,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:20,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:20,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:20,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:20,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:20,820 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) [2021-11-23 02:00:23,084 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.26s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:25,261 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:25,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:25,558 INFO L93 Difference]: Finished difference Result 418 states and 532 transitions. [2021-11-23 02:00:25,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:25,560 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 [2021-11-23 02:00:25,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:25,562 INFO L225 Difference]: With dead ends: 418 [2021-11-23 02:00:25,563 INFO L226 Difference]: Without dead ends: 415 [2021-11-23 02:00:25,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:25,564 INFO L933 BasicCegarLoop]: 310 mSDtfsCounter, 319 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s 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 [2021-11-23 02:00:25,564 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] [2021-11-23 02:00:25,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-11-23 02:00:25,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 410. [2021-11-23 02:00:25,598 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) [2021-11-23 02:00:25,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 525 transitions. [2021-11-23 02:00:25,602 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 525 transitions. Word has length 14 [2021-11-23 02:00:25,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:25,603 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 525 transitions. [2021-11-23 02:00:25,603 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) [2021-11-23 02:00:25,603 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 525 transitions. [2021-11-23 02:00:25,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:00:25,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:25,605 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:25,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:00:25,605 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:25,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:25,606 INFO L85 PathProgramCache]: Analyzing trace with hash -473873084, now seen corresponding path program 1 times [2021-11-23 02:00:25,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:25,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969177230] [2021-11-23 02:00:25,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:25,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:25,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:26,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:26,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:26,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969177230] [2021-11-23 02:00:26,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969177230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:26,235 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:26,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:26,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362924860] [2021-11-23 02:00:26,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:26,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:26,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:26,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:26,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:26,240 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) [2021-11-23 02:00:28,524 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.28s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:30,718 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:31,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:31,033 INFO L93 Difference]: Finished difference Result 417 states and 530 transitions. [2021-11-23 02:00:31,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:31,034 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 [2021-11-23 02:00:31,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:31,037 INFO L225 Difference]: With dead ends: 417 [2021-11-23 02:00:31,037 INFO L226 Difference]: Without dead ends: 414 [2021-11-23 02:00:31,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:31,039 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:31,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 467 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:00:31,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-11-23 02:00:31,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 409. [2021-11-23 02:00:31,062 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) [2021-11-23 02:00:31,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 523 transitions. [2021-11-23 02:00:31,066 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 523 transitions. Word has length 15 [2021-11-23 02:00:31,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:31,067 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 523 transitions. [2021-11-23 02:00:31,067 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) [2021-11-23 02:00:31,067 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 523 transitions. [2021-11-23 02:00:31,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:00:31,068 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:31,068 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:31,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:00:31,069 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:31,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:31,069 INFO L85 PathProgramCache]: Analyzing trace with hash -1805507638, now seen corresponding path program 1 times [2021-11-23 02:00:31,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:31,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761410231] [2021-11-23 02:00:31,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:31,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:31,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:31,890 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:31,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:31,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761410231] [2021-11-23 02:00:31,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761410231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:31,891 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:31,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:31,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699467302] [2021-11-23 02:00:31,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:31,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:31,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:31,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:31,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:31,894 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) [2021-11-23 02:00:34,248 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.35s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:36,459 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:36,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:36,720 INFO L93 Difference]: Finished difference Result 910 states and 1165 transitions. [2021-11-23 02:00:36,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:36,721 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 [2021-11-23 02:00:36,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:36,725 INFO L225 Difference]: With dead ends: 910 [2021-11-23 02:00:36,725 INFO L226 Difference]: Without dead ends: 505 [2021-11-23 02:00:36,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:36,728 INFO L933 BasicCegarLoop]: 317 mSDtfsCounter, 179 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s 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 [2021-11-23 02:00:36,728 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] [2021-11-23 02:00:36,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-23 02:00:36,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 496. [2021-11-23 02:00:36,761 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) [2021-11-23 02:00:36,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 623 transitions. [2021-11-23 02:00:36,766 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 623 transitions. Word has length 16 [2021-11-23 02:00:36,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:36,767 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 623 transitions. [2021-11-23 02:00:36,767 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) [2021-11-23 02:00:36,767 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 623 transitions. [2021-11-23 02:00:36,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:00:36,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:36,769 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:36,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:00:36,769 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:36,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:36,770 INFO L85 PathProgramCache]: Analyzing trace with hash -136500985, now seen corresponding path program 1 times [2021-11-23 02:00:36,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:36,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388211305] [2021-11-23 02:00:36,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:36,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:37,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:37,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:37,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:37,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388211305] [2021-11-23 02:00:37,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388211305] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:37,424 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:37,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:37,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212740628] [2021-11-23 02:00:37,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:37,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:37,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:37,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:37,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:37,426 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) [2021-11-23 02:00:39,765 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.33s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:41,888 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:42,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:42,208 INFO L93 Difference]: Finished difference Result 509 states and 634 transitions. [2021-11-23 02:00:42,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:42,209 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 [2021-11-23 02:00:42,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:42,213 INFO L225 Difference]: With dead ends: 509 [2021-11-23 02:00:42,213 INFO L226 Difference]: Without dead ends: 506 [2021-11-23 02:00:42,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:42,215 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 [2021-11-23 02:00:42,215 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] [2021-11-23 02:00:42,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-23 02:00:42,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 495. [2021-11-23 02:00:42,241 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) [2021-11-23 02:00:42,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 621 transitions. [2021-11-23 02:00:42,245 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 621 transitions. Word has length 17 [2021-11-23 02:00:42,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:42,245 INFO L470 AbstractCegarLoop]: Abstraction has 495 states and 621 transitions. [2021-11-23 02:00:42,246 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) [2021-11-23 02:00:42,246 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 621 transitions. [2021-11-23 02:00:42,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:00:42,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:42,247 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:42,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:00:42,248 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:42,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:42,248 INFO L85 PathProgramCache]: Analyzing trace with hash 63102573, now seen corresponding path program 1 times [2021-11-23 02:00:42,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:42,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126120271] [2021-11-23 02:00:42,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:42,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:42,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:42,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:42,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126120271] [2021-11-23 02:00:42,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126120271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:42,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:42,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:42,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924490] [2021-11-23 02:00:42,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:42,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:42,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:42,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:42,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:42,832 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) [2021-11-23 02:00:45,107 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:47,258 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:47,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:47,570 INFO L93 Difference]: Finished difference Result 508 states and 632 transitions. [2021-11-23 02:00:47,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:47,571 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 [2021-11-23 02:00:47,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:47,575 INFO L225 Difference]: With dead ends: 508 [2021-11-23 02:00:47,575 INFO L226 Difference]: Without dead ends: 505 [2021-11-23 02:00:47,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:47,576 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, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:00:47,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [309 Valid, 462 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 02:00:47,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-23 02:00:47,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 494. [2021-11-23 02:00:47,603 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) [2021-11-23 02:00:47,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 619 transitions. [2021-11-23 02:00:47,608 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 619 transitions. Word has length 18 [2021-11-23 02:00:47,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:47,608 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 619 transitions. [2021-11-23 02:00:47,608 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) [2021-11-23 02:00:47,608 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 619 transitions. [2021-11-23 02:00:47,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:00:47,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:47,612 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:00:47,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:00:47,613 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:47,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:47,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1955850442, now seen corresponding path program 1 times [2021-11-23 02:00:47,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:47,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513692354] [2021-11-23 02:00:47,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:47,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:47,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:48,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:48,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:48,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513692354] [2021-11-23 02:00:48,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513692354] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:48,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:48,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:48,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303675563] [2021-11-23 02:00:48,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:48,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:48,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:48,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:48,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:48,268 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) [2021-11-23 02:00:50,547 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:52,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:52,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:52,979 INFO L93 Difference]: Finished difference Result 500 states and 622 transitions. [2021-11-23 02:00:52,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:52,980 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 [2021-11-23 02:00:52,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:52,984 INFO L225 Difference]: With dead ends: 500 [2021-11-23 02:00:52,984 INFO L226 Difference]: Without dead ends: 496 [2021-11-23 02:00:52,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:52,985 INFO L933 BasicCegarLoop]: 266 mSDtfsCounter, 82 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s 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 [2021-11-23 02:00:52,986 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] [2021-11-23 02:00:52,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-11-23 02:00:53,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 494. [2021-11-23 02:00:53,011 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) [2021-11-23 02:00:53,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 616 transitions. [2021-11-23 02:00:53,015 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 616 transitions. Word has length 19 [2021-11-23 02:00:53,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:53,016 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 616 transitions. [2021-11-23 02:00:53,016 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) [2021-11-23 02:00:53,016 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 616 transitions. [2021-11-23 02:00:53,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:00:53,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:53,017 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] [2021-11-23 02:00:53,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:00:53,018 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:53,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:53,018 INFO L85 PathProgramCache]: Analyzing trace with hash 501497104, now seen corresponding path program 1 times [2021-11-23 02:00:53,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:53,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48593213] [2021-11-23 02:00:53,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:53,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:53,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:53,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:53,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:53,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48593213] [2021-11-23 02:00:53,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48593213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:53,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:53,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:53,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053584471] [2021-11-23 02:00:53,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:53,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:53,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:53,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:53,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:53,565 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) [2021-11-23 02:00:55,819 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.25s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:00:57,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:00:58,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:00:58,280 INFO L93 Difference]: Finished difference Result 507 states and 627 transitions. [2021-11-23 02:00:58,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:00:58,281 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 [2021-11-23 02:00:58,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:00:58,285 INFO L225 Difference]: With dead ends: 507 [2021-11-23 02:00:58,285 INFO L226 Difference]: Without dead ends: 492 [2021-11-23 02:00:58,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:58,287 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 [2021-11-23 02:00:58,287 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] [2021-11-23 02:00:58,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-23 02:00:58,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 481. [2021-11-23 02:00:58,314 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) [2021-11-23 02:00:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 601 transitions. [2021-11-23 02:00:58,317 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 601 transitions. Word has length 20 [2021-11-23 02:00:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:00:58,318 INFO L470 AbstractCegarLoop]: Abstraction has 481 states and 601 transitions. [2021-11-23 02:00:58,318 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) [2021-11-23 02:00:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 601 transitions. [2021-11-23 02:00:58,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:00:58,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:00:58,319 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] [2021-11-23 02:00:58,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:00:58,320 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:00:58,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:00:58,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1248122496, now seen corresponding path program 1 times [2021-11-23 02:00:58,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:00:58,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339650608] [2021-11-23 02:00:58,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:00:58,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:00:58,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:00:58,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:00:58,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:00:58,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339650608] [2021-11-23 02:00:58,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339650608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:00:58,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:00:58,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:00:58,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042711075] [2021-11-23 02:00:58,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:00:58,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:00:58,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:00:58,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:00:58,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:00:58,933 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) [2021-11-23 02:01:01,186 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.25s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:01:03,414 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:01:03,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:03,652 INFO L93 Difference]: Finished difference Result 968 states and 1215 transitions. [2021-11-23 02:01:03,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:01:03,653 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 [2021-11-23 02:01:03,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:03,657 INFO L225 Difference]: With dead ends: 968 [2021-11-23 02:01:03,657 INFO L226 Difference]: Without dead ends: 491 [2021-11-23 02:01:03,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:01:03,660 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 30 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s 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 [2021-11-23 02:01:03,660 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] [2021-11-23 02:01:03,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-11-23 02:01:03,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 491. [2021-11-23 02:01:03,687 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) [2021-11-23 02:01:03,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 616 transitions. [2021-11-23 02:01:03,690 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 616 transitions. Word has length 27 [2021-11-23 02:01:03,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:03,691 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 616 transitions. [2021-11-23 02:01:03,691 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) [2021-11-23 02:01:03,691 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 616 transitions. [2021-11-23 02:01:03,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:01:03,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:03,692 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] [2021-11-23 02:01:03,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:01:03,693 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:03,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:03,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1532540731, now seen corresponding path program 1 times [2021-11-23 02:01:03,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:03,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874862348] [2021-11-23 02:01:03,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:03,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:04,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:04,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:01:04,548 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:04,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874862348] [2021-11-23 02:01:04,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874862348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:01:04,549 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:01:04,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:01:04,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75660013] [2021-11-23 02:01:04,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:01:04,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:01:04,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:04,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:01:04,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:01:04,551 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) [2021-11-23 02:01:06,900 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.34s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:01:09,060 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:01:09,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:09,367 INFO L93 Difference]: Finished difference Result 504 states and 627 transitions. [2021-11-23 02:01:09,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:01:09,368 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 [2021-11-23 02:01:09,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:09,371 INFO L225 Difference]: With dead ends: 504 [2021-11-23 02:01:09,371 INFO L226 Difference]: Without dead ends: 501 [2021-11-23 02:01:09,372 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 [2021-11-23 02:01:09,372 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:09,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 505 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:01:09,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-23 02:01:09,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 490. [2021-11-23 02:01:09,401 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) [2021-11-23 02:01:09,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 614 transitions. [2021-11-23 02:01:09,404 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 614 transitions. Word has length 34 [2021-11-23 02:01:09,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:09,405 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 614 transitions. [2021-11-23 02:01:09,405 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) [2021-11-23 02:01:09,405 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 614 transitions. [2021-11-23 02:01:09,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:01:09,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:09,406 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] [2021-11-23 02:01:09,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:01:09,407 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:09,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:09,407 INFO L85 PathProgramCache]: Analyzing trace with hash 759579910, now seen corresponding path program 1 times [2021-11-23 02:01:09,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:09,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675118926] [2021-11-23 02:01:09,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:09,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:09,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:10,087 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:01:10,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:10,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675118926] [2021-11-23 02:01:10,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675118926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:01:10,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:01:10,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:01:10,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969441137] [2021-11-23 02:01:10,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:01:10,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:01:10,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:10,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:01:10,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:01:10,091 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) [2021-11-23 02:01:12,433 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.34s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:01:14,697 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:01:14,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:14,957 INFO L93 Difference]: Finished difference Result 979 states and 1228 transitions. [2021-11-23 02:01:14,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:01:14,957 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 [2021-11-23 02:01:14,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:14,961 INFO L225 Difference]: With dead ends: 979 [2021-11-23 02:01:14,962 INFO L226 Difference]: Without dead ends: 490 [2021-11-23 02:01:14,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:01:14,965 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 1 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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 [2021-11-23 02:01:14,965 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] [2021-11-23 02:01:14,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-11-23 02:01:14,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2021-11-23 02:01:14,994 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) [2021-11-23 02:01:14,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 613 transitions. [2021-11-23 02:01:14,997 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 613 transitions. Word has length 41 [2021-11-23 02:01:14,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:14,998 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 613 transitions. [2021-11-23 02:01:14,998 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) [2021-11-23 02:01:14,998 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 613 transitions. [2021-11-23 02:01:14,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:01:14,999 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:14,999 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] [2021-11-23 02:01:15,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:01:15,000 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:15,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:15,001 INFO L85 PathProgramCache]: Analyzing trace with hash -2110849133, now seen corresponding path program 1 times [2021-11-23 02:01:15,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:15,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376454235] [2021-11-23 02:01:15,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:15,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:15,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:01:15,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:15,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376454235] [2021-11-23 02:01:15,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376454235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:01:15,644 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:01:15,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:01:15,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122783461] [2021-11-23 02:01:15,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:01:15,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:01:15,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:15,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:01:15,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:01:15,646 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) [2021-11-23 02:01:18,077 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.42s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:01:20,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:01:20,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:20,505 INFO L93 Difference]: Finished difference Result 492 states and 614 transitions. [2021-11-23 02:01:20,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:01:20,506 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 [2021-11-23 02:01:20,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:20,509 INFO L225 Difference]: With dead ends: 492 [2021-11-23 02:01:20,509 INFO L226 Difference]: Without dead ends: 489 [2021-11-23 02:01:20,510 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 [2021-11-23 02:01:20,510 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 3 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:20,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 488 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:01:20,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-23 02:01:20,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 489. [2021-11-23 02:01:20,538 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) [2021-11-23 02:01:20,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 611 transitions. [2021-11-23 02:01:20,541 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 611 transitions. Word has length 42 [2021-11-23 02:01:20,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:20,542 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 611 transitions. [2021-11-23 02:01:20,542 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) [2021-11-23 02:01:20,542 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 611 transitions. [2021-11-23 02:01:20,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:01:20,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:20,544 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] [2021-11-23 02:01:20,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:01:20,544 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:20,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:20,545 INFO L85 PathProgramCache]: Analyzing trace with hash -823142469, now seen corresponding path program 1 times [2021-11-23 02:01:20,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:20,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461565853] [2021-11-23 02:01:20,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:20,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:20,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:21,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:01:21,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:21,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461565853] [2021-11-23 02:01:21,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461565853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:01:21,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:01:21,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:01:21,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591125463] [2021-11-23 02:01:21,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:01:21,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:01:21,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:21,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:01:21,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:01:21,244 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) [2021-11-23 02:01:23,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.33s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:01:25,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:01:26,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:26,434 INFO L93 Difference]: Finished difference Result 962 states and 1210 transitions. [2021-11-23 02:01:26,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:01:26,434 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 [2021-11-23 02:01:26,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:26,439 INFO L225 Difference]: With dead ends: 962 [2021-11-23 02:01:26,439 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 02:01:26,441 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 [2021-11-23 02:01:26,442 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 [2021-11-23 02:01:26,443 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] [2021-11-23 02:01:26,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 02:01:26,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 566. [2021-11-23 02:01:26,475 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) [2021-11-23 02:01:26,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 566 states to 566 states and 709 transitions. [2021-11-23 02:01:26,479 INFO L78 Accepts]: Start accepts. Automaton has 566 states and 709 transitions. Word has length 60 [2021-11-23 02:01:26,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:26,479 INFO L470 AbstractCegarLoop]: Abstraction has 566 states and 709 transitions. [2021-11-23 02:01:26,480 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) [2021-11-23 02:01:26,480 INFO L276 IsEmpty]: Start isEmpty. Operand 566 states and 709 transitions. [2021-11-23 02:01:26,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 02:01:26,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:26,482 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] [2021-11-23 02:01:26,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:01:26,483 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:26,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:26,484 INFO L85 PathProgramCache]: Analyzing trace with hash 179758317, now seen corresponding path program 1 times [2021-11-23 02:01:26,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:26,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734547262] [2021-11-23 02:01:26,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:26,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:02:35,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 02:02:35,622 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.