./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 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/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_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P --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-53f42b1 [2021-11-20 23:45:08,763 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:45:08,765 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:45:08,822 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:45:08,823 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:45:08,828 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:45:08,831 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:45:08,836 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:45:08,839 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:45:08,847 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:45:08,848 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:45:08,850 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:45:08,850 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:45:08,851 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:45:08,853 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:45:08,854 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:45:08,855 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:45:08,856 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:45:08,859 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:45:08,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:45:08,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:45:08,880 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:45:08,887 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:45:08,888 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:45:08,891 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:45:08,892 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:45:08,892 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:45:08,893 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:45:08,894 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:45:08,895 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:45:08,896 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:45:08,897 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:45:08,898 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:45:08,899 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:45:08,903 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:45:08,905 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:45:08,906 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:45:08,906 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:45:08,906 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:45:08,907 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:45:08,908 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:45:08,909 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-20 23:45:08,957 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:45:08,957 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:45:08,957 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:45:08,958 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:45:08,958 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:45:08,959 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:45:08,959 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:45:08,965 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:45:08,965 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:45:08,965 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:45:08,966 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:45:08,967 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:45:08,967 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:45:08,967 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:45:08,967 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:45:08,968 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:45:08,968 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:45:08,968 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:45:08,969 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:45:08,969 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:45:08,970 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:45:08,970 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:45:08,970 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:45:08,970 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:45:08,971 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:45:08,971 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:45:08,971 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:45:08,972 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:45:08,972 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:45:08,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:45:08,973 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:45:08,973 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:45:08,973 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:45:08,974 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:45:08,974 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:45:08,974 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:45:08,974 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:45:08,974 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:45:08,975 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_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8ebe8fd9a8e0d537f351c5a7c305717ff0a45de7ead6b00d56cae7f5bf422b2 [2021-11-20 23:45:09,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:45:09,298 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:45:09,300 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:45:09,302 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:45:09,303 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:45:09,304 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-20 23:45:09,368 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/data/0f7715a3e/6e8e5a6682cf4ee09b431359106ea750/FLAG4d9ffa1a0 [2021-11-20 23:45:10,903 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:45:10,904 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-20 23:45:11,029 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/data/0f7715a3e/6e8e5a6682cf4ee09b431359106ea750/FLAG4d9ffa1a0 [2021-11-20 23:45:11,294 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/data/0f7715a3e/6e8e5a6682cf4ee09b431359106ea750 [2021-11-20 23:45:11,297 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:45:11,299 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:45:11,301 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:45:11,301 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:45:11,308 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:45:11,309 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:45:11" (1/1) ... [2021-11-20 23:45:11,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a28f301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:11, skipping insertion in model container [2021-11-20 23:45:11,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:45:11" (1/1) ... [2021-11-20 23:45:11,320 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:45:11,920 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:45:29,991 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_ad963fcb-0fd2-41db-af66-003ba71775c4/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-20 23:45:30,794 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:45:30,896 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:45:32,557 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_ad963fcb-0fd2-41db-af66-003ba71775c4/sv-benchmarks/c/ldv-linux-3.7.3/main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i[1057113,1057126] [2021-11-20 23:45:32,600 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:45:34,101 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:45:34,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34 WrapperNode [2021-11-20 23:45:34,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:45:34,104 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:45:34,104 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:45:34,104 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:45:34,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:34,608 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,064 INFO L137 Inliner]: procedures = 1364, calls = 15139, calls flagged for inlining = 461, calls inlined = 24, statements flattened = 6423 [2021-11-20 23:45:35,080 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:45:35,081 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:45:35,081 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:45:35,082 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:45:35,101 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,178 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,179 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,366 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,381 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,431 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,482 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:45:35,483 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:45:35,483 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:45:35,483 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:45:35,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (1/1) ... [2021-11-20 23:45:35,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:45:35,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:35,525 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:45:35,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ad963fcb-0fd2-41db-af66-003ba71775c4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:45:35,577 INFO L130 BoogieDeclarations]: Found specification of procedure device_lock___5 [2021-11-20 23:45:35,578 INFO L138 BoogieDeclarations]: Found implementation of procedure device_lock___5 [2021-11-20 23:45:35,578 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-20 23:45:35,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_usb_bus_list_lock [2021-11-20 23:45:35,578 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_dir_in [2021-11-20 23:45:35,578 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_dir_in [2021-11-20 23:45:35,579 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_poll [2021-11-20 23:45:35,579 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_poll [2021-11-20 23:45:35,579 INFO L130 BoogieDeclarations]: Found specification of procedure device_unlock___5 [2021-11-20 23:45:35,579 INFO L138 BoogieDeclarations]: Found implementation of procedure device_unlock___5 [2021-11-20 23:45:35,579 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_initialize [2021-11-20 23:45:35,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_initialize [2021-11-20 23:45:35,580 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:45:35,580 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-20 23:45:35,580 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-20 23:45:35,580 INFO L130 BoogieDeclarations]: Found specification of procedure usb_hub_find_child [2021-11-20 23:45:35,581 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_hub_find_child [2021-11-20 23:45:35,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-20 23:45:35,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:45:35,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-20 23:45:35,581 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-20 23:45:35,581 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_mutex [2021-11-20 23:45:35,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_mutex [2021-11-20 23:45:35,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:45:35,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:45:35,582 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-20 23:45:35,582 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-20 23:45:35,583 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-20 23:45:35,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-20 23:45:35,583 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-20 23:45:35,583 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-20 23:45:35,583 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:45:35,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-20 23:45:35,584 INFO L130 BoogieDeclarations]: Found specification of procedure hdev_to_hub [2021-11-20 23:45:35,584 INFO L138 BoogieDeclarations]: Found implementation of procedure hdev_to_hub [2021-11-20 23:45:35,584 INFO L130 BoogieDeclarations]: Found specification of procedure __get_free_pages [2021-11-20 23:45:35,584 INFO L138 BoogieDeclarations]: Found implementation of procedure __get_free_pages [2021-11-20 23:45:35,585 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:45:35,585 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-20 23:45:35,585 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-20 23:45:35,585 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-20 23:45:35,585 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-20 23:45:35,586 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_return_value [2021-11-20 23:45:35,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_return_value [2021-11-20 23:45:35,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:45:35,586 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-20 23:45:35,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_usb_bus_list_lock [2021-11-20 23:45:35,586 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_i_mutex [2021-11-20 23:45:35,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_i_mutex [2021-11-20 23:45:35,587 INFO L130 BoogieDeclarations]: Found specification of procedure usb_device_dump [2021-11-20 23:45:35,587 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_device_dump [2021-11-20 23:45:35,587 INFO L130 BoogieDeclarations]: Found specification of procedure dev_get_drvdata [2021-11-20 23:45:35,588 INFO L138 BoogieDeclarations]: Found implementation of procedure dev_get_drvdata [2021-11-20 23:45:35,588 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-20 23:45:35,588 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_mutex [2021-11-20 23:45:35,588 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_mutex [2021-11-20 23:45:35,588 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_intfdata [2021-11-20 23:45:35,589 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_intfdata [2021-11-20 23:45:35,589 INFO L130 BoogieDeclarations]: Found specification of procedure class_decode [2021-11-20 23:45:35,589 INFO L138 BoogieDeclarations]: Found implementation of procedure class_decode [2021-11-20 23:45:35,589 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_maxp [2021-11-20 23:45:35,589 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_maxp [2021-11-20 23:45:35,590 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_read [2021-11-20 23:45:35,590 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_read [2021-11-20 23:45:35,590 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_type [2021-11-20 23:45:35,590 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_type [2021-11-20 23:45:35,590 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-20 23:45:35,591 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-20 23:45:35,591 INFO L130 BoogieDeclarations]: Found specification of procedure poll_wait [2021-11-20 23:45:35,591 INFO L138 BoogieDeclarations]: Found implementation of procedure poll_wait [2021-11-20 23:45:35,591 INFO L130 BoogieDeclarations]: Found specification of procedure bus_to_hcd [2021-11-20 23:45:35,591 INFO L138 BoogieDeclarations]: Found implementation of procedure bus_to_hcd [2021-11-20 23:45:35,591 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_i_mutex [2021-11-20 23:45:35,592 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_i_mutex [2021-11-20 23:45:35,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-20 23:45:35,592 INFO L130 BoogieDeclarations]: Found specification of procedure might_fault [2021-11-20 23:45:35,592 INFO L138 BoogieDeclarations]: Found implementation of procedure might_fault [2021-11-20 23:45:35,592 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_handler_precall [2021-11-20 23:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_handler_precall [2021-11-20 23:45:35,593 INFO L130 BoogieDeclarations]: Found specification of procedure free_pages [2021-11-20 23:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure free_pages [2021-11-20 23:45:35,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:45:35,593 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_final_state [2021-11-20 23:45:35,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_final_state [2021-11-20 23:45:36,385 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:45:36,388 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:50:08,439 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:50:09,883 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:50:09,884 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-20 23:50:09,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:50:09 BoogieIcfgContainer [2021-11-20 23:50:09,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:50:09,892 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:50:09,893 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:50:09,897 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:50:09,897 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:45:11" (1/3) ... [2021-11-20 23:50:09,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@289014cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:50:09, skipping insertion in model container [2021-11-20 23:50:09,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:34" (2/3) ... [2021-11-20 23:50:09,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@289014cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:50:09, skipping insertion in model container [2021-11-20 23:50:09,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:50:09" (3/3) ... [2021-11-20 23:50:09,901 INFO L111 eAbstractionObserver]: Analyzing ICFG main15_drivers-usb-core-usbcore-ko--32_7a--linux-3.7.3.i [2021-11-20 23:50:09,908 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:50:09,908 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:50:09,979 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:50:09,989 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 [2021-11-20 23:50:09,990 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:50:10,027 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) [2021-11-20 23:50:10,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:50:10,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:10,037 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:10,037 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:10,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:10,045 INFO L85 PathProgramCache]: Analyzing trace with hash 8244193, now seen corresponding path program 1 times [2021-11-20 23:50:10,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:10,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220645049] [2021-11-20 23:50:10,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:10,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:10,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:11,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:11,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:11,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220645049] [2021-11-20 23:50:11,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220645049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:11,676 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:11,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:11,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841660340] [2021-11-20 23:50:11,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:11,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:11,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:11,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:11,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:11,746 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) [2021-11-20 23:50:14,192 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.41s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:16,456 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:16,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:16,802 INFO L93 Difference]: Finished difference Result 690 states and 946 transitions. [2021-11-20 23:50:16,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:16,805 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 [2021-11-20 23:50:16,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:16,827 INFO L225 Difference]: With dead ends: 690 [2021-11-20 23:50:16,827 INFO L226 Difference]: Without dead ends: 418 [2021-11-20 23:50:16,837 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 [2021-11-20 23:50:16,843 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 337 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s 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 [2021-11-20 23:50:16,852 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] [2021-11-20 23:50:16,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-11-20 23:50:16,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 413. [2021-11-20 23:50:16,975 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) [2021-11-20 23:50:16,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 534 transitions. [2021-11-20 23:50:16,987 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 534 transitions. Word has length 10 [2021-11-20 23:50:16,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:16,988 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 534 transitions. [2021-11-20 23:50:16,989 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) [2021-11-20 23:50:16,991 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 534 transitions. [2021-11-20 23:50:16,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:50:16,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:16,996 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:16,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:50:16,997 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:16,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:16,998 INFO L85 PathProgramCache]: Analyzing trace with hash 255201726, now seen corresponding path program 1 times [2021-11-20 23:50:16,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:16,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748775376] [2021-11-20 23:50:16,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:17,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:17,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:17,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:17,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:17,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748775376] [2021-11-20 23:50:17,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748775376] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:17,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:17,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:17,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091983938] [2021-11-20 23:50:17,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:17,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:17,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:17,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:17,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:17,925 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) [2021-11-20 23:50:20,314 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:22,534 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:22,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:22,895 INFO L93 Difference]: Finished difference Result 420 states and 539 transitions. [2021-11-20 23:50:22,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:22,896 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 [2021-11-20 23:50:22,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:22,902 INFO L225 Difference]: With dead ends: 420 [2021-11-20 23:50:22,902 INFO L226 Difference]: Without dead ends: 417 [2021-11-20 23:50:22,903 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 [2021-11-20 23:50:22,905 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 [2021-11-20 23:50:22,906 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] [2021-11-20 23:50:22,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-20 23:50:22,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2021-11-20 23:50:22,948 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) [2021-11-20 23:50:22,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 532 transitions. [2021-11-20 23:50:22,954 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 532 transitions. Word has length 11 [2021-11-20 23:50:22,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:22,954 INFO L470 AbstractCegarLoop]: Abstraction has 412 states and 532 transitions. [2021-11-20 23:50:22,955 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) [2021-11-20 23:50:22,955 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 532 transitions. [2021-11-20 23:50:22,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:50:22,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:22,956 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:22,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:50:22,957 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:22,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:22,957 INFO L85 PathProgramCache]: Analyzing trace with hash -679044476, now seen corresponding path program 1 times [2021-11-20 23:50:22,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:22,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825815683] [2021-11-20 23:50:22,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:22,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:23,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:23,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:23,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:23,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825815683] [2021-11-20 23:50:23,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825815683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:23,787 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:23,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:23,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539649264] [2021-11-20 23:50:23,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:23,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:23,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:23,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:23,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:23,790 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) [2021-11-20 23:50:26,141 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.34s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:28,330 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:28,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:28,690 INFO L93 Difference]: Finished difference Result 419 states and 537 transitions. [2021-11-20 23:50:28,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:28,691 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 [2021-11-20 23:50:28,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:28,696 INFO L225 Difference]: With dead ends: 419 [2021-11-20 23:50:28,696 INFO L226 Difference]: Without dead ends: 416 [2021-11-20 23:50:28,696 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 [2021-11-20 23:50:28,698 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 [2021-11-20 23:50:28,699 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] [2021-11-20 23:50:28,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-20 23:50:28,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-20 23:50:28,732 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) [2021-11-20 23:50:28,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 530 transitions. [2021-11-20 23:50:28,737 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 530 transitions. Word has length 12 [2021-11-20 23:50:28,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:28,738 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 530 transitions. [2021-11-20 23:50:28,738 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) [2021-11-20 23:50:28,738 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 530 transitions. [2021-11-20 23:50:28,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:50:28,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:28,741 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:28,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:50:28,760 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:28,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:28,761 INFO L85 PathProgramCache]: Analyzing trace with hash 424099201, now seen corresponding path program 1 times [2021-11-20 23:50:28,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:28,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994133564] [2021-11-20 23:50:28,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:28,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:29,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:29,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:29,540 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:29,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994133564] [2021-11-20 23:50:29,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994133564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:29,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:29,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:29,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873704572] [2021-11-20 23:50:29,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:29,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:29,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:29,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:29,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:29,545 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) [2021-11-20 23:50:31,888 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.34s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:34,113 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:34,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:34,461 INFO L93 Difference]: Finished difference Result 420 states and 536 transitions. [2021-11-20 23:50:34,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:34,462 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 [2021-11-20 23:50:34,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:34,466 INFO L225 Difference]: With dead ends: 420 [2021-11-20 23:50:34,466 INFO L226 Difference]: Without dead ends: 416 [2021-11-20 23:50:34,467 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 [2021-11-20 23:50:34,469 INFO L933 BasicCegarLoop]: 311 mSDtfsCounter, 311 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:34,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 476 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:50:34,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-20 23:50:34,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 411. [2021-11-20 23:50:34,500 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) [2021-11-20 23:50:34,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 527 transitions. [2021-11-20 23:50:34,505 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 527 transitions. Word has length 13 [2021-11-20 23:50:34,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:34,506 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 527 transitions. [2021-11-20 23:50:34,506 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) [2021-11-20 23:50:34,506 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 527 transitions. [2021-11-20 23:50:34,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:50:34,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:34,508 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:34,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:50:34,508 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:34,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:34,509 INFO L85 PathProgramCache]: Analyzing trace with hash 261819687, now seen corresponding path program 1 times [2021-11-20 23:50:34,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:34,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772587355] [2021-11-20 23:50:34,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:34,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:34,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:35,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:35,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:35,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772587355] [2021-11-20 23:50:35,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772587355] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:35,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:35,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:35,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997112414] [2021-11-20 23:50:35,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:35,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:35,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:35,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:35,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:35,452 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) [2021-11-20 23:50:37,779 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:39,992 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:40,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:40,328 INFO L93 Difference]: Finished difference Result 418 states and 532 transitions. [2021-11-20 23:50:40,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:40,329 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 [2021-11-20 23:50:40,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:40,332 INFO L225 Difference]: With dead ends: 418 [2021-11-20 23:50:40,333 INFO L226 Difference]: Without dead ends: 415 [2021-11-20 23:50:40,333 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 [2021-11-20 23:50:40,338 INFO L933 BasicCegarLoop]: 310 mSDtfsCounter, 319 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:40,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [321 Valid, 469 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-20 23:50:40,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-11-20 23:50:40,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 410. [2021-11-20 23:50:40,383 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) [2021-11-20 23:50:40,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 525 transitions. [2021-11-20 23:50:40,388 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 525 transitions. Word has length 14 [2021-11-20 23:50:40,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:40,390 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 525 transitions. [2021-11-20 23:50:40,390 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) [2021-11-20 23:50:40,390 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 525 transitions. [2021-11-20 23:50:40,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:50:40,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:40,392 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:40,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:50:40,393 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:40,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:40,394 INFO L85 PathProgramCache]: Analyzing trace with hash -473873084, now seen corresponding path program 1 times [2021-11-20 23:50:40,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:40,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167034505] [2021-11-20 23:50:40,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:40,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:40,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:41,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:41,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:41,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167034505] [2021-11-20 23:50:41,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167034505] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:41,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:41,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:41,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849235618] [2021-11-20 23:50:41,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:41,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:41,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:41,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:41,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:41,122 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) [2021-11-20 23:50:43,539 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.41s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:45,738 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:46,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:46,077 INFO L93 Difference]: Finished difference Result 417 states and 530 transitions. [2021-11-20 23:50:46,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:46,079 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 [2021-11-20 23:50:46,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:46,083 INFO L225 Difference]: With dead ends: 417 [2021-11-20 23:50:46,083 INFO L226 Difference]: Without dead ends: 414 [2021-11-20 23:50:46,084 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 [2021-11-20 23:50:46,085 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 316 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:46,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 467 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:50:46,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-11-20 23:50:46,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 409. [2021-11-20 23:50:46,112 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) [2021-11-20 23:50:46,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 523 transitions. [2021-11-20 23:50:46,117 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 523 transitions. Word has length 15 [2021-11-20 23:50:46,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:46,118 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 523 transitions. [2021-11-20 23:50:46,118 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) [2021-11-20 23:50:46,118 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 523 transitions. [2021-11-20 23:50:46,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:50:46,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:46,120 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:46,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:50:46,120 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:46,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:46,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1805507638, now seen corresponding path program 1 times [2021-11-20 23:50:46,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:46,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449219508] [2021-11-20 23:50:46,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:46,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:46,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:46,837 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:46,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449219508] [2021-11-20 23:50:46,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449219508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:46,837 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:46,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:46,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094625920] [2021-11-20 23:50:46,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:46,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:46,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:46,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:46,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:46,840 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) [2021-11-20 23:50:49,170 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:51,403 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:51,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:51,687 INFO L93 Difference]: Finished difference Result 910 states and 1165 transitions. [2021-11-20 23:50:51,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:51,688 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 [2021-11-20 23:50:51,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:51,693 INFO L225 Difference]: With dead ends: 910 [2021-11-20 23:50:51,693 INFO L226 Difference]: Without dead ends: 505 [2021-11-20 23:50:51,696 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 [2021-11-20 23:50:51,697 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 [2021-11-20 23:50:51,698 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] [2021-11-20 23:50:51,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-20 23:50:51,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 496. [2021-11-20 23:50:51,732 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) [2021-11-20 23:50:51,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 623 transitions. [2021-11-20 23:50:51,738 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 623 transitions. Word has length 16 [2021-11-20 23:50:51,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:51,739 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 623 transitions. [2021-11-20 23:50:51,739 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) [2021-11-20 23:50:51,739 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 623 transitions. [2021-11-20 23:50:51,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:50:51,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:51,741 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:51,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:50:51,741 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:51,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:51,742 INFO L85 PathProgramCache]: Analyzing trace with hash -136500985, now seen corresponding path program 1 times [2021-11-20 23:50:51,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:51,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561749765] [2021-11-20 23:50:51,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:51,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:52,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:52,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:52,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:52,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561749765] [2021-11-20 23:50:52,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561749765] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:52,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:52,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:52,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882197306] [2021-11-20 23:50:52,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:52,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:52,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:52,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:52,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:52,448 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) [2021-11-20 23:50:54,933 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.48s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:50:57,091 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:50:57,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:57,426 INFO L93 Difference]: Finished difference Result 509 states and 634 transitions. [2021-11-20 23:50:57,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:57,428 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 [2021-11-20 23:50:57,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:57,434 INFO L225 Difference]: With dead ends: 509 [2021-11-20 23:50:57,434 INFO L226 Difference]: Without dead ends: 506 [2021-11-20 23:50:57,435 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 [2021-11-20 23:50:57,436 INFO L933 BasicCegarLoop]: 305 mSDtfsCounter, 310 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:57,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 464 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:50:57,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-20 23:50:57,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 495. [2021-11-20 23:50:57,470 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) [2021-11-20 23:50:57,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 621 transitions. [2021-11-20 23:50:57,479 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 621 transitions. Word has length 17 [2021-11-20 23:50:57,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:57,479 INFO L470 AbstractCegarLoop]: Abstraction has 495 states and 621 transitions. [2021-11-20 23:50:57,480 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) [2021-11-20 23:50:57,480 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 621 transitions. [2021-11-20 23:50:57,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:50:57,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:57,485 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:57,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:50:57,486 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:57,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:57,486 INFO L85 PathProgramCache]: Analyzing trace with hash 63102573, now seen corresponding path program 1 times [2021-11-20 23:50:57,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:57,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759881848] [2021-11-20 23:50:57,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:57,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:57,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:58,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:58,136 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:58,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759881848] [2021-11-20 23:50:58,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759881848] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:58,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:58,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:50:58,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975281231] [2021-11-20 23:50:58,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:58,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:58,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:58,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:58,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:50:58,140 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) [2021-11-20 23:51:00,550 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.40s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:02,720 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:03,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:03,033 INFO L93 Difference]: Finished difference Result 508 states and 632 transitions. [2021-11-20 23:51:03,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:03,034 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 [2021-11-20 23:51:03,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:03,038 INFO L225 Difference]: With dead ends: 508 [2021-11-20 23:51:03,039 INFO L226 Difference]: Without dead ends: 505 [2021-11-20 23:51:03,039 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 [2021-11-20 23:51:03,040 INFO L933 BasicCegarLoop]: 303 mSDtfsCounter, 307 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:03,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [309 Valid, 462 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-20 23:51:03,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-20 23:51:03,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 494. [2021-11-20 23:51:03,073 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) [2021-11-20 23:51:03,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 619 transitions. [2021-11-20 23:51:03,078 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 619 transitions. Word has length 18 [2021-11-20 23:51:03,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:03,078 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 619 transitions. [2021-11-20 23:51:03,079 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) [2021-11-20 23:51:03,079 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 619 transitions. [2021-11-20 23:51:03,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:51:03,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:03,083 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:03,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:51:03,084 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:03,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:03,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1955850442, now seen corresponding path program 1 times [2021-11-20 23:51:03,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:03,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392376506] [2021-11-20 23:51:03,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:03,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:03,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:03,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:51:03,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:03,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392376506] [2021-11-20 23:51:03,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392376506] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:03,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:03,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:51:03,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343756959] [2021-11-20 23:51:03,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:03,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:03,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:03,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:03,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:51:03,673 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) [2021-11-20 23:51:05,937 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.26s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:08,157 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:08,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:08,366 INFO L93 Difference]: Finished difference Result 500 states and 622 transitions. [2021-11-20 23:51:08,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:08,367 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 [2021-11-20 23:51:08,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:08,371 INFO L225 Difference]: With dead ends: 500 [2021-11-20 23:51:08,372 INFO L226 Difference]: Without dead ends: 496 [2021-11-20 23:51:08,372 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 [2021-11-20 23:51:08,373 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 [2021-11-20 23:51:08,374 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] [2021-11-20 23:51:08,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-11-20 23:51:08,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 494. [2021-11-20 23:51:08,404 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) [2021-11-20 23:51:08,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 616 transitions. [2021-11-20 23:51:08,409 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 616 transitions. Word has length 19 [2021-11-20 23:51:08,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:08,409 INFO L470 AbstractCegarLoop]: Abstraction has 494 states and 616 transitions. [2021-11-20 23:51:08,410 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) [2021-11-20 23:51:08,410 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 616 transitions. [2021-11-20 23:51:08,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:51:08,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:08,411 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] [2021-11-20 23:51:08,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:51:08,411 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:08,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:08,412 INFO L85 PathProgramCache]: Analyzing trace with hash 501497104, now seen corresponding path program 1 times [2021-11-20 23:51:08,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:08,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693789069] [2021-11-20 23:51:08,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:08,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:08,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:08,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:51:08,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:08,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693789069] [2021-11-20 23:51:08,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693789069] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:08,964 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:08,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:51:08,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987710123] [2021-11-20 23:51:08,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:08,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:08,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:08,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:08,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:51:08,966 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) [2021-11-20 23:51:11,236 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.26s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:13,391 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:13,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:13,725 INFO L93 Difference]: Finished difference Result 507 states and 627 transitions. [2021-11-20 23:51:13,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:13,726 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 [2021-11-20 23:51:13,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:13,731 INFO L225 Difference]: With dead ends: 507 [2021-11-20 23:51:13,731 INFO L226 Difference]: Without dead ends: 492 [2021-11-20 23:51:13,732 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 [2021-11-20 23:51:13,732 INFO L933 BasicCegarLoop]: 298 mSDtfsCounter, 299 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s 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 [2021-11-20 23:51:13,733 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] [2021-11-20 23:51:13,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-11-20 23:51:13,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 481. [2021-11-20 23:51:13,762 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) [2021-11-20 23:51:13,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 601 transitions. [2021-11-20 23:51:13,766 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 601 transitions. Word has length 20 [2021-11-20 23:51:13,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:13,766 INFO L470 AbstractCegarLoop]: Abstraction has 481 states and 601 transitions. [2021-11-20 23:51:13,767 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) [2021-11-20 23:51:13,767 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 601 transitions. [2021-11-20 23:51:13,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:51:13,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:13,768 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] [2021-11-20 23:51:13,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-20 23:51:13,769 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:13,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:13,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1248122496, now seen corresponding path program 1 times [2021-11-20 23:51:13,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:13,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259275126] [2021-11-20 23:51:13,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:13,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:14,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:14,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:51:14,522 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:14,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259275126] [2021-11-20 23:51:14,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259275126] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:14,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:14,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:51:14,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322129959] [2021-11-20 23:51:14,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:14,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:14,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:14,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:14,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:51:14,525 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) [2021-11-20 23:51:16,903 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:19,139 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:19,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:19,379 INFO L93 Difference]: Finished difference Result 968 states and 1215 transitions. [2021-11-20 23:51:19,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:19,380 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 [2021-11-20 23:51:19,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:19,384 INFO L225 Difference]: With dead ends: 968 [2021-11-20 23:51:19,384 INFO L226 Difference]: Without dead ends: 491 [2021-11-20 23:51:19,387 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 [2021-11-20 23:51:19,388 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 30 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:19,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 466 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 109 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-20 23:51:19,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-11-20 23:51:19,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 491. [2021-11-20 23:51:19,418 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) [2021-11-20 23:51:19,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 616 transitions. [2021-11-20 23:51:19,422 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 616 transitions. Word has length 27 [2021-11-20 23:51:19,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:19,423 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 616 transitions. [2021-11-20 23:51:19,423 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) [2021-11-20 23:51:19,423 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 616 transitions. [2021-11-20 23:51:19,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:51:19,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:19,425 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] [2021-11-20 23:51:19,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 23:51:19,425 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:19,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:19,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1532540731, now seen corresponding path program 1 times [2021-11-20 23:51:19,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:19,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596287373] [2021-11-20 23:51:19,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:19,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:19,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:20,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:51:20,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:20,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596287373] [2021-11-20 23:51:20,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596287373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:20,315 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:20,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:51:20,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571792478] [2021-11-20 23:51:20,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:20,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:20,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:20,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:20,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:51:20,317 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) [2021-11-20 23:51:22,695 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:24,870 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:25,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:25,255 INFO L93 Difference]: Finished difference Result 504 states and 627 transitions. [2021-11-20 23:51:25,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:25,256 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 [2021-11-20 23:51:25,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:25,261 INFO L225 Difference]: With dead ends: 504 [2021-11-20 23:51:25,261 INFO L226 Difference]: Without dead ends: 501 [2021-11-20 23:51:25,262 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 [2021-11-20 23:51:25,262 INFO L933 BasicCegarLoop]: 282 mSDtfsCounter, 213 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:25,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 505 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:51:25,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-20 23:51:25,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 490. [2021-11-20 23:51:25,298 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) [2021-11-20 23:51:25,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 614 transitions. [2021-11-20 23:51:25,302 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 614 transitions. Word has length 34 [2021-11-20 23:51:25,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:25,303 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 614 transitions. [2021-11-20 23:51:25,303 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) [2021-11-20 23:51:25,303 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 614 transitions. [2021-11-20 23:51:25,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:51:25,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:25,306 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] [2021-11-20 23:51:25,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 23:51:25,307 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:25,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:25,308 INFO L85 PathProgramCache]: Analyzing trace with hash 759579910, now seen corresponding path program 1 times [2021-11-20 23:51:25,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:25,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975982001] [2021-11-20 23:51:25,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:25,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:25,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:26,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:51:26,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:26,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975982001] [2021-11-20 23:51:26,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975982001] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:26,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:26,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:51:26,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679614172] [2021-11-20 23:51:26,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:26,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:51:26,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:26,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:51:26,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:51:26,131 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) [2021-11-20 23:51:28,557 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.42s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:30,833 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:31,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:31,092 INFO L93 Difference]: Finished difference Result 979 states and 1228 transitions. [2021-11-20 23:51:31,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:51:31,093 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 [2021-11-20 23:51:31,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:31,097 INFO L225 Difference]: With dead ends: 979 [2021-11-20 23:51:31,097 INFO L226 Difference]: Without dead ends: 490 [2021-11-20 23:51:31,099 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 [2021-11-20 23:51:31,100 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 1 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s 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, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:31,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 744 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 165 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:51:31,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-11-20 23:51:31,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2021-11-20 23:51:31,132 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) [2021-11-20 23:51:31,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 613 transitions. [2021-11-20 23:51:31,136 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 613 transitions. Word has length 41 [2021-11-20 23:51:31,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:31,136 INFO L470 AbstractCegarLoop]: Abstraction has 490 states and 613 transitions. [2021-11-20 23:51:31,137 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) [2021-11-20 23:51:31,137 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 613 transitions. [2021-11-20 23:51:31,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:51:31,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:31,138 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] [2021-11-20 23:51:31,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 23:51:31,139 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:31,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:31,139 INFO L85 PathProgramCache]: Analyzing trace with hash -2110849133, now seen corresponding path program 1 times [2021-11-20 23:51:31,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:31,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007888832] [2021-11-20 23:51:31,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:31,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:31,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:31,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:51:31,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:31,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007888832] [2021-11-20 23:51:31,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007888832] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:31,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:31,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:51:31,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059368] [2021-11-20 23:51:31,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:31,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:31,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:31,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:31,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:51:31,821 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) [2021-11-20 23:51:34,196 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:36,413 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:36,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:36,669 INFO L93 Difference]: Finished difference Result 492 states and 614 transitions. [2021-11-20 23:51:36,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:36,670 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 [2021-11-20 23:51:36,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:36,674 INFO L225 Difference]: With dead ends: 492 [2021-11-20 23:51:36,675 INFO L226 Difference]: Without dead ends: 489 [2021-11-20 23:51:36,675 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 [2021-11-20 23:51:36,676 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 [2021-11-20 23:51:36,676 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] [2021-11-20 23:51:36,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-20 23:51:36,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 489. [2021-11-20 23:51:36,709 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) [2021-11-20 23:51:36,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 611 transitions. [2021-11-20 23:51:36,713 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 611 transitions. Word has length 42 [2021-11-20 23:51:36,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:36,714 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 611 transitions. [2021-11-20 23:51:36,714 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) [2021-11-20 23:51:36,714 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 611 transitions. [2021-11-20 23:51:36,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:51:36,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:36,716 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] [2021-11-20 23:51:36,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-20 23:51:36,716 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:36,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:36,717 INFO L85 PathProgramCache]: Analyzing trace with hash -823142469, now seen corresponding path program 1 times [2021-11-20 23:51:36,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:36,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371460333] [2021-11-20 23:51:36,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:36,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:37,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:37,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:51:37,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:37,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371460333] [2021-11-20 23:51:37,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371460333] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:37,504 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:37,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:51:37,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816452792] [2021-11-20 23:51:37,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:37,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:51:37,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:37,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:51:37,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:51:37,506 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) [2021-11-20 23:51:39,921 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.41s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-20 23:51:42,336 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 23:51:42,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:42,944 INFO L93 Difference]: Finished difference Result 962 states and 1210 transitions. [2021-11-20 23:51:42,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:51:42,945 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 [2021-11-20 23:51:42,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:42,951 INFO L225 Difference]: With dead ends: 962 [2021-11-20 23:51:42,951 INFO L226 Difference]: Without dead ends: 575 [2021-11-20 23:51:42,953 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 [2021-11-20 23:51:42,954 INFO L933 BasicCegarLoop]: 238 mSDtfsCounter, 317 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 131 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s 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, 5.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:42,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 484 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 274 Invalid, 2 Unknown, 0 Unchecked, 5.4s Time] [2021-11-20 23:51:42,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-20 23:51:42,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 566. [2021-11-20 23:51:42,994 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) [2021-11-20 23:51:42,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 566 states to 566 states and 709 transitions. [2021-11-20 23:51:42,999 INFO L78 Accepts]: Start accepts. Automaton has 566 states and 709 transitions. Word has length 60 [2021-11-20 23:51:42,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:43,000 INFO L470 AbstractCegarLoop]: Abstraction has 566 states and 709 transitions. [2021-11-20 23:51:43,000 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) [2021-11-20 23:51:43,000 INFO L276 IsEmpty]: Start isEmpty. Operand 566 states and 709 transitions. [2021-11-20 23:51:43,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-20 23:51:43,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:43,002 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] [2021-11-20 23:51:43,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-20 23:51:43,003 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:43,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:43,004 INFO L85 PathProgramCache]: Analyzing trace with hash 179758317, now seen corresponding path program 1 times [2021-11-20 23:51:43,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:43,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139088144] [2021-11-20 23:51:43,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:43,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:53:10,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-20 23:53:10,449 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.