./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 436e6e57c04bd43264564f478c3aa92ec3799e6c36d71ae9bac6692f2873338f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:23:55,162 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:23:55,166 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:23:55,223 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:23:55,224 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:23:55,226 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:23:55,228 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:23:55,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:23:55,232 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:23:55,234 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:23:55,235 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:23:55,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:23:55,238 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:23:55,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:23:55,241 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:23:55,243 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:23:55,244 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:23:55,246 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:23:55,248 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:23:55,251 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:23:55,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:23:55,261 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:23:55,263 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:23:55,265 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:23:55,269 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:23:55,275 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:23:55,276 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:23:55,277 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:23:55,279 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:23:55,281 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:23:55,282 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:23:55,283 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:23:55,285 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:23:55,287 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:23:55,289 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:23:55,289 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:23:55,291 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:23:55,291 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:23:55,291 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:23:55,292 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:23:55,293 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:23:55,294 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:23:55,342 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:23:55,342 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:23:55,343 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:23:55,343 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:23:55,343 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:23:55,343 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:23:55,344 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:23:55,344 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:23:55,344 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:23:55,345 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:23:55,345 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:23:55,345 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:23:55,345 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:23:55,346 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:23:55,346 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:23:55,346 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:23:55,347 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:23:55,347 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:23:55,348 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:23:55,348 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:23:55,349 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:23:55,349 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:23:55,349 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:23:55,349 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:23:55,350 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:23:55,350 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:23:55,350 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:23:55,351 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:23:55,351 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:23:55,351 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:23:55,352 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:23:55,352 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:23:55,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:23:55,353 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:23:55,353 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:23:55,353 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:23:55,353 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:23:55,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:23:55,354 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:23:55,354 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:23:55,355 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:23:55,355 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_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436e6e57c04bd43264564f478c3aa92ec3799e6c36d71ae9bac6692f2873338f [2021-11-23 02:23:55,708 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:23:55,740 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:23:55,743 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:23:55,745 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:23:55,746 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:23:55,747 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c [2021-11-23 02:23:55,860 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/data/b83228280/30d6e56aa9f74a768a3cb445fb5be545/FLAG839a655b0 [2021-11-23 02:23:56,667 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:23:56,668 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c [2021-11-23 02:23:56,709 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/data/b83228280/30d6e56aa9f74a768a3cb445fb5be545/FLAG839a655b0 [2021-11-23 02:23:56,768 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/data/b83228280/30d6e56aa9f74a768a3cb445fb5be545 [2021-11-23 02:23:56,773 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:23:56,776 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:23:56,780 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:23:56,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:23:56,784 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:23:56,785 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:23:56" (1/1) ... [2021-11-23 02:23:56,788 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@751b0934 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:56, skipping insertion in model container [2021-11-23 02:23:56,789 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:23:56" (1/1) ... [2021-11-23 02:23:56,797 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:23:56,897 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:23:57,138 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_b5a1a56f-430c-4f50-b9a9-9e7f03101082/sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c[1868,1881] [2021-11-23 02:23:57,806 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:23:57,831 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:23:57,849 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_b5a1a56f-430c-4f50-b9a9-9e7f03101082/sv-benchmarks/c/seq-mthreaded/rekh_ctm.4.c[1868,1881] [2021-11-23 02:23:58,217 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:23:58,270 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:23:58,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58 WrapperNode [2021-11-23 02:23:58,271 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:23:58,272 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:23:58,273 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:23:58,273 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:23:58,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:58,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:58,703 INFO L137 Inliner]: procedures = 99, calls = 2906, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 8512 [2021-11-23 02:23:58,704 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:23:58,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:23:58,706 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:23:58,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:23:58,717 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:58,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:58,788 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:58,788 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:59,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:59,079 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:59,153 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:59,215 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:23:59,216 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:23:59,216 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:23:59,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:23:59,218 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (1/1) ... [2021-11-23 02:23:59,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:23:59,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:59,259 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:23:59,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:23:59,307 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_state [2021-11-23 02:23:59,307 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_state [2021-11-23 02:23:59,307 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_state [2021-11-23 02:23:59,308 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_state [2021-11-23 02:23:59,308 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:23:59,308 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_need_to_run_nxtbg [2021-11-23 02:23:59,308 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_need_to_run_nxtbg [2021-11-23 02:23:59,308 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-23 02:23:59,308 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-23 02:23:59,308 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write___startrek_current_priority [2021-11-23 02:23:59,310 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write___startrek_current_priority [2021-11-23 02:23:59,310 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_input [2021-11-23 02:23:59,310 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_input [2021-11-23 02:23:59,311 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_hyperperiod [2021-11-23 02:23:59,311 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_hyperperiod [2021-11-23 02:23:59,311 INFO L130 BoogieDeclarations]: Found specification of procedure bg_nxtcolorsensor [2021-11-23 02:23:59,311 INFO L138 BoogieDeclarations]: Found implementation of procedure bg_nxtcolorsensor [2021-11-23 02:23:59,312 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Writer [2021-11-23 02:23:59,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Writer [2021-11-23 02:23:59,312 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtcolorsensor_mode [2021-11-23 02:23:59,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtcolorsensor_mode [2021-11-23 02:23:59,312 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-23 02:23:59,313 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_count [2021-11-23 02:23:59,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_count [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_T_state [2021-11-23 02:23:59,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_T_state [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_output [2021-11-23 02:23:59,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_output [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure move_motor [2021-11-23 02:23:59,313 INFO L138 BoogieDeclarations]: Found implementation of procedure move_motor [2021-11-23 02:23:59,313 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_speed [2021-11-23 02:23:59,314 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_speed [2021-11-23 02:23:59,314 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-23 02:23:59,314 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-23 02:23:59,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:23:59,315 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-23 02:23:59,315 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-23 02:23:59,315 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_set_nxtcolorsensor [2021-11-23 02:23:59,315 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_set_nxtcolorsensor [2021-11-23 02:23:59,315 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t3 [2021-11-23 02:23:59,315 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t3 [2021-11-23 02:23:59,315 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_output [2021-11-23 02:23:59,316 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_output [2021-11-23 02:23:59,316 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-23 02:23:59,317 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-23 02:23:59,318 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_T_count [2021-11-23 02:23:59,318 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_T_count [2021-11-23 02:23:59,319 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-23 02:23:59,319 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-23 02:23:59,319 INFO L130 BoogieDeclarations]: Found specification of procedure TerminateTask [2021-11-23 02:23:59,319 INFO L138 BoogieDeclarations]: Found implementation of procedure TerminateTask [2021-11-23 02:23:59,319 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_W_count [2021-11-23 02:23:59,319 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_W_count [2021-11-23 02:23:59,319 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read___startrek_current_priority [2021-11-23 02:23:59,320 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read___startrek_current_priority [2021-11-23 02:23:59,320 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_count [2021-11-23 02:23:59,320 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_count [2021-11-23 02:23:59,320 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_count [2021-11-23 02:23:59,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_count [2021-11-23 02:23:59,321 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_T_speed [2021-11-23 02:23:59,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_T_speed [2021-11-23 02:23:59,321 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtcolorsensor_data_mode [2021-11-23 02:23:59,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtcolorsensor_data_mode [2021-11-23 02:23:59,321 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_threshold [2021-11-23 02:23:59,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_threshold [2021-11-23 02:23:59,321 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_need_to_read [2021-11-23 02:23:59,322 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_need_to_read [2021-11-23 02:23:59,322 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_R_state [2021-11-23 02:23:59,322 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_R_state [2021-11-23 02:23:59,322 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Reader [2021-11-23 02:23:59,322 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Reader [2021-11-23 02:23:59,322 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_dir [2021-11-23 02:23:59,323 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_dir [2021-11-23 02:23:59,323 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_W_speed [2021-11-23 02:23:59,323 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_W_speed [2021-11-23 02:23:59,323 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_input [2021-11-23 02:23:59,323 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_input [2021-11-23 02:23:59,323 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_R_state [2021-11-23 02:23:59,324 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_R_state [2021-11-23 02:23:59,324 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_need_to_run_nxtbg [2021-11-23 02:23:59,324 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_need_to_run_nxtbg [2021-11-23 02:23:59,325 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_W_state [2021-11-23 02:23:59,325 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_W_state [2021-11-23 02:23:59,325 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_R_count [2021-11-23 02:23:59,325 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_R_count [2021-11-23 02:23:59,326 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_TapeMover [2021-11-23 02:23:59,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_TapeMover [2021-11-23 02:23:59,326 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:23:59,326 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_Controller [2021-11-23 02:23:59,327 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_Controller [2021-11-23 02:23:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:23:59,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:23:59,995 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:23:59,998 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:24:23,069 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:24:31,886 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:24:31,887 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 02:24:31,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:24:31 BoogieIcfgContainer [2021-11-23 02:24:31,894 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:24:31,897 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:24:31,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:24:31,901 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:24:31,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:23:56" (1/3) ... [2021-11-23 02:24:31,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f2a576f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:24:31, skipping insertion in model container [2021-11-23 02:24:31,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:23:58" (2/3) ... [2021-11-23 02:24:31,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f2a576f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:24:31, skipping insertion in model container [2021-11-23 02:24:31,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:24:31" (3/3) ... [2021-11-23 02:24:31,910 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_ctm.4.c [2021-11-23 02:24:31,919 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:24:31,919 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:24:32,004 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:24:32,023 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:24:32,032 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:24:32,082 INFO L276 IsEmpty]: Start isEmpty. Operand has 967 states, 613 states have (on average 1.3833605220228384) internal successors, (848), 637 states have internal predecessors, (848), 308 states have call successors, (308), 44 states have call predecessors, (308), 44 states have return successors, (308), 298 states have call predecessors, (308), 308 states have call successors, (308) [2021-11-23 02:24:32,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:24:32,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:32,091 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] [2021-11-23 02:24:32,091 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:32,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:32,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1062196608, now seen corresponding path program 1 times [2021-11-23 02:24:32,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:32,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234473173] [2021-11-23 02:24:32,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:32,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:32,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:33,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:24:33,036 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:33,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234473173] [2021-11-23 02:24:33,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234473173] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:33,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:33,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:24:33,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747087095] [2021-11-23 02:24:33,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:33,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:24:33,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:33,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:24:33,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:24:33,101 INFO L87 Difference]: Start difference. First operand has 967 states, 613 states have (on average 1.3833605220228384) internal successors, (848), 637 states have internal predecessors, (848), 308 states have call successors, (308), 44 states have call predecessors, (308), 44 states have return successors, (308), 298 states have call predecessors, (308), 308 states have call successors, (308) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:24:34,183 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:36,269 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:37,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:37,189 INFO L93 Difference]: Finished difference Result 1932 states and 2947 transitions. [2021-11-23 02:24:37,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:24:37,192 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2021-11-23 02:24:37,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:37,224 INFO L225 Difference]: With dead ends: 1932 [2021-11-23 02:24:37,224 INFO L226 Difference]: Without dead ends: 965 [2021-11-23 02:24:37,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:24:37,256 INFO L933 BasicCegarLoop]: 1377 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1377 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:37,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1377 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 1 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 02:24:37,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 965 states. [2021-11-23 02:24:37,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 965 to 965. [2021-11-23 02:24:37,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 965 states, 612 states have (on average 1.3758169934640523) internal successors, (842), 636 states have internal predecessors, (842), 308 states have call successors, (308), 44 states have call predecessors, (308), 44 states have return successors, (307), 297 states have call predecessors, (307), 307 states have call successors, (307) [2021-11-23 02:24:37,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 965 states to 965 states and 1457 transitions. [2021-11-23 02:24:37,464 INFO L78 Accepts]: Start accepts. Automaton has 965 states and 1457 transitions. Word has length 23 [2021-11-23 02:24:37,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:37,469 INFO L470 AbstractCegarLoop]: Abstraction has 965 states and 1457 transitions. [2021-11-23 02:24:37,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:24:37,470 INFO L276 IsEmpty]: Start isEmpty. Operand 965 states and 1457 transitions. [2021-11-23 02:24:37,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 02:24:37,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:37,491 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:37,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:24:37,491 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:37,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:37,493 INFO L85 PathProgramCache]: Analyzing trace with hash -895969735, now seen corresponding path program 1 times [2021-11-23 02:24:37,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:37,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675585872] [2021-11-23 02:24:37,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:37,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:37,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:24:38,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:38,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675585872] [2021-11-23 02:24:38,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675585872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:38,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:38,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:24:38,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018872811] [2021-11-23 02:24:38,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:38,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:24:38,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:38,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:24:38,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:24:38,252 INFO L87 Difference]: Start difference. First operand 965 states and 1457 transitions. Second operand has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:24:41,094 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:45,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:45,100 INFO L93 Difference]: Finished difference Result 2689 states and 4075 transitions. [2021-11-23 02:24:45,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:24:45,104 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 79 [2021-11-23 02:24:45,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:45,129 INFO L225 Difference]: With dead ends: 2689 [2021-11-23 02:24:45,130 INFO L226 Difference]: Without dead ends: 1726 [2021-11-23 02:24:45,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:24:45,141 INFO L933 BasicCegarLoop]: 1871 mSDtfsCounter, 1424 mSDsluCounter, 3978 mSDsCounter, 0 mSdLazyCounter, 1038 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1428 SdHoareTripleChecker+Valid, 5611 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1038 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:45,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1428 Valid, 5611 Invalid, 1056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1038 Invalid, 1 Unknown, 0 Unchecked, 6.5s Time] [2021-11-23 02:24:45,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1726 states. [2021-11-23 02:24:45,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1726 to 1674. [2021-11-23 02:24:45,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1674 states, 1071 states have (on average 1.3818860877684407) internal successors, (1480), 1110 states have internal predecessors, (1480), 522 states have call successors, (522), 80 states have call predecessors, (522), 80 states have return successors, (524), 505 states have call predecessors, (524), 521 states have call successors, (524) [2021-11-23 02:24:45,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 2526 transitions. [2021-11-23 02:24:45,317 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 2526 transitions. Word has length 79 [2021-11-23 02:24:45,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:45,318 INFO L470 AbstractCegarLoop]: Abstraction has 1674 states and 2526 transitions. [2021-11-23 02:24:45,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:24:45,318 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 2526 transitions. [2021-11-23 02:24:45,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 02:24:45,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:45,328 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:45,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:24:45,329 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:45,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:45,330 INFO L85 PathProgramCache]: Analyzing trace with hash -868791374, now seen corresponding path program 1 times [2021-11-23 02:24:45,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:45,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372585700] [2021-11-23 02:24:45,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:45,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:45,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:45,931 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:24:45,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:45,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372585700] [2021-11-23 02:24:45,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372585700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:45,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:45,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:24:45,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441881252] [2021-11-23 02:24:45,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:45,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:24:45,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:45,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:24:45,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:24:45,935 INFO L87 Difference]: Start difference. First operand 1674 states and 2526 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:24:48,646 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:24:52,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:24:52,585 INFO L93 Difference]: Finished difference Result 3389 states and 5128 transitions. [2021-11-23 02:24:52,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:24:52,591 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 80 [2021-11-23 02:24:52,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:24:52,615 INFO L225 Difference]: With dead ends: 3389 [2021-11-23 02:24:52,615 INFO L226 Difference]: Without dead ends: 1717 [2021-11-23 02:24:52,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:24:52,633 INFO L933 BasicCegarLoop]: 1851 mSDtfsCounter, 1407 mSDsluCounter, 3957 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1411 SdHoareTripleChecker+Valid, 5571 SdHoareTripleChecker+Invalid, 1047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:24:52,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1411 Valid, 5571 Invalid, 1047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1029 Invalid, 1 Unknown, 0 Unchecked, 6.4s Time] [2021-11-23 02:24:52,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1717 states. [2021-11-23 02:24:52,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1717 to 1665. [2021-11-23 02:24:52,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1665 states, 1065 states have (on average 1.380281690140845) internal successors, (1470), 1104 states have internal predecessors, (1470), 519 states have call successors, (519), 80 states have call predecessors, (519), 80 states have return successors, (521), 502 states have call predecessors, (521), 518 states have call successors, (521) [2021-11-23 02:24:52,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1665 states to 1665 states and 2510 transitions. [2021-11-23 02:24:52,777 INFO L78 Accepts]: Start accepts. Automaton has 1665 states and 2510 transitions. Word has length 80 [2021-11-23 02:24:52,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:24:52,780 INFO L470 AbstractCegarLoop]: Abstraction has 1665 states and 2510 transitions. [2021-11-23 02:24:52,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:24:52,780 INFO L276 IsEmpty]: Start isEmpty. Operand 1665 states and 2510 transitions. [2021-11-23 02:24:52,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:24:52,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:24:52,787 INFO L514 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:24:52,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:24:52,788 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:24:52,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:24:52,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1178533909, now seen corresponding path program 1 times [2021-11-23 02:24:52,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:24:52,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941277196] [2021-11-23 02:24:52,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:24:52,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:24:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:53,480 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:24:53,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:24:53,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941277196] [2021-11-23 02:24:53,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941277196] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:24:53,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:24:53,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:24:53,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683498912] [2021-11-23 02:24:53,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:24:53,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:24:53,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:53,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:24:53,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:24:53,484 INFO L87 Difference]: Start difference. First operand 1665 states and 2510 transitions. Second operand has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:24:56,131 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:01,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:01,579 INFO L93 Difference]: Finished difference Result 3589 states and 5405 transitions. [2021-11-23 02:25:01,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:25:01,579 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 81 [2021-11-23 02:25:01,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:01,599 INFO L225 Difference]: With dead ends: 3589 [2021-11-23 02:25:01,600 INFO L226 Difference]: Without dead ends: 1926 [2021-11-23 02:25:01,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:01,614 INFO L933 BasicCegarLoop]: 1605 mSDtfsCounter, 2739 mSDsluCounter, 899 mSDsCounter, 0 mSdLazyCounter, 1533 mSolverCounterSat, 589 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2739 SdHoareTripleChecker+Valid, 2399 SdHoareTripleChecker+Invalid, 2123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 589 IncrementalHoareTripleChecker+Valid, 1533 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:01,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2739 Valid, 2399 Invalid, 2123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [589 Valid, 1533 Invalid, 1 Unknown, 0 Unchecked, 7.8s Time] [2021-11-23 02:25:01,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1926 states. [2021-11-23 02:25:01,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1926 to 1923. [2021-11-23 02:25:01,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1923 states, 1236 states have (on average 1.3843042071197411) internal successors, (1711), 1283 states have internal predecessors, (1711), 585 states have call successors, (585), 101 states have call predecessors, (585), 101 states have return successors, (586), 564 states have call predecessors, (586), 584 states have call successors, (586) [2021-11-23 02:25:01,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1923 states to 1923 states and 2882 transitions. [2021-11-23 02:25:01,751 INFO L78 Accepts]: Start accepts. Automaton has 1923 states and 2882 transitions. Word has length 81 [2021-11-23 02:25:01,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:01,751 INFO L470 AbstractCegarLoop]: Abstraction has 1923 states and 2882 transitions. [2021-11-23 02:25:01,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:25:01,752 INFO L276 IsEmpty]: Start isEmpty. Operand 1923 states and 2882 transitions. [2021-11-23 02:25:01,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:25:01,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:01,754 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:01,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:25:01,755 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:01,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:01,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1731072468, now seen corresponding path program 1 times [2021-11-23 02:25:01,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:01,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322686647] [2021-11-23 02:25:01,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:01,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:01,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:02,196 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:25:02,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:02,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322686647] [2021-11-23 02:25:02,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322686647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:25:02,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676557516] [2021-11-23 02:25:02,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:02,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:02,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:25:02,209 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:25:02,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:25:03,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:03,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:25:03,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:25:03,572 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:25:03,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:25:03,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676557516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:03,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:25:03,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:25:03,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054733123] [2021-11-23 02:25:03,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:03,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:03,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:03,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:03,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:25:03,575 INFO L87 Difference]: Start difference. First operand 1923 states and 2882 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:25:06,702 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:12,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:12,923 INFO L93 Difference]: Finished difference Result 4228 states and 6331 transitions. [2021-11-23 02:25:12,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:25:12,924 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 78 [2021-11-23 02:25:12,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:12,948 INFO L225 Difference]: With dead ends: 4228 [2021-11-23 02:25:12,948 INFO L226 Difference]: Without dead ends: 2307 [2021-11-23 02:25:12,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:25:12,965 INFO L933 BasicCegarLoop]: 1396 mSDtfsCounter, 1429 mSDsluCounter, 2284 mSDsCounter, 0 mSdLazyCounter, 2163 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1430 SdHoareTripleChecker+Valid, 3494 SdHoareTripleChecker+Invalid, 2173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2163 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:12,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1430 Valid, 3494 Invalid, 2173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2163 Invalid, 1 Unknown, 0 Unchecked, 9.1s Time] [2021-11-23 02:25:12,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2307 states. [2021-11-23 02:25:13,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2307 to 2292. [2021-11-23 02:25:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2292 states, 1477 states have (on average 1.3852403520649965) internal successors, (2046), 1531 states have internal predecessors, (2046), 681 states have call successors, (681), 132 states have call predecessors, (681), 133 states have return successors, (681), 654 states have call predecessors, (681), 680 states have call successors, (681) [2021-11-23 02:25:13,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2292 states to 2292 states and 3408 transitions. [2021-11-23 02:25:13,143 INFO L78 Accepts]: Start accepts. Automaton has 2292 states and 3408 transitions. Word has length 78 [2021-11-23 02:25:13,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:13,144 INFO L470 AbstractCegarLoop]: Abstraction has 2292 states and 3408 transitions. [2021-11-23 02:25:13,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:25:13,144 INFO L276 IsEmpty]: Start isEmpty. Operand 2292 states and 3408 transitions. [2021-11-23 02:25:13,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:25:13,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:13,148 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] [2021-11-23 02:25:13,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:25:13,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:13,365 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:13,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:13,365 INFO L85 PathProgramCache]: Analyzing trace with hash 64316356, now seen corresponding path program 1 times [2021-11-23 02:25:13,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:13,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086036902] [2021-11-23 02:25:13,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:13,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:13,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:13,824 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:25:13,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:13,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086036902] [2021-11-23 02:25:13,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086036902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:13,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:13,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:25:13,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669977136] [2021-11-23 02:25:13,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:13,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:25:13,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:13,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:25:13,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:13,827 INFO L87 Difference]: Start difference. First operand 2292 states and 3408 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:25:16,505 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:25,499 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:25,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:25,777 INFO L93 Difference]: Finished difference Result 3976 states and 5914 transitions. [2021-11-23 02:25:25,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:25:25,778 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 78 [2021-11-23 02:25:25,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:25,796 INFO L225 Difference]: With dead ends: 3976 [2021-11-23 02:25:25,796 INFO L226 Difference]: Without dead ends: 1686 [2021-11-23 02:25:25,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:25:25,811 INFO L933 BasicCegarLoop]: 1685 mSDtfsCounter, 2721 mSDsluCounter, 1464 mSDsCounter, 0 mSdLazyCounter, 2328 mSolverCounterSat, 497 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2721 SdHoareTripleChecker+Valid, 2981 SdHoareTripleChecker+Invalid, 2827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 497 IncrementalHoareTripleChecker+Valid, 2328 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:25,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2721 Valid, 2981 Invalid, 2827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [497 Valid, 2328 Invalid, 2 Unknown, 0 Unchecked, 11.6s Time] [2021-11-23 02:25:25,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1686 states. [2021-11-23 02:25:25,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1686 to 1680. [2021-11-23 02:25:25,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1680 states, 1082 states have (on average 1.378003696857671) internal successors, (1491), 1121 states have internal predecessors, (1491), 499 states have call successors, (499), 98 states have call predecessors, (499), 98 states have return successors, (498), 480 states have call predecessors, (498), 498 states have call successors, (498) [2021-11-23 02:25:25,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 2488 transitions. [2021-11-23 02:25:25,938 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 2488 transitions. Word has length 78 [2021-11-23 02:25:25,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:25,939 INFO L470 AbstractCegarLoop]: Abstraction has 1680 states and 2488 transitions. [2021-11-23 02:25:25,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:25:25,940 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 2488 transitions. [2021-11-23 02:25:25,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:25:25,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:25,949 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:25,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:25:25,950 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:25,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:25,950 INFO L85 PathProgramCache]: Analyzing trace with hash 2121514097, now seen corresponding path program 1 times [2021-11-23 02:25:25,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:25,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263174092] [2021-11-23 02:25:25,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:25,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:26,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:26,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:25:26,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:26,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263174092] [2021-11-23 02:25:26,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263174092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:26,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:26,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:25:26,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725732985] [2021-11-23 02:25:26,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:26,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:25:26,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:26,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:25:26,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:26,493 INFO L87 Difference]: Start difference. First operand 1680 states and 2488 transitions. Second operand has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:25:29,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:38,743 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:38,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:38,875 INFO L93 Difference]: Finished difference Result 3362 states and 4987 transitions. [2021-11-23 02:25:38,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:25:38,877 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 77 [2021-11-23 02:25:38,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:38,892 INFO L225 Difference]: With dead ends: 3362 [2021-11-23 02:25:38,892 INFO L226 Difference]: Without dead ends: 1684 [2021-11-23 02:25:38,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:25:38,903 INFO L933 BasicCegarLoop]: 1681 mSDtfsCounter, 3260 mSDsluCounter, 942 mSDsCounter, 0 mSdLazyCounter, 1628 mSolverCounterSat, 860 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3260 SdHoareTripleChecker+Valid, 2518 SdHoareTripleChecker+Invalid, 2490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 860 IncrementalHoareTripleChecker+Valid, 1628 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:38,903 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3260 Valid, 2518 Invalid, 2490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [860 Valid, 1628 Invalid, 2 Unknown, 0 Unchecked, 12.1s Time] [2021-11-23 02:25:38,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1684 states. [2021-11-23 02:25:38,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1684 to 1678. [2021-11-23 02:25:39,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1678 states, 1081 states have (on average 1.3774283071230342) internal successors, (1489), 1120 states have internal predecessors, (1489), 498 states have call successors, (498), 98 states have call predecessors, (498), 98 states have return successors, (497), 479 states have call predecessors, (497), 497 states have call successors, (497) [2021-11-23 02:25:39,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1678 states to 1678 states and 2484 transitions. [2021-11-23 02:25:39,013 INFO L78 Accepts]: Start accepts. Automaton has 1678 states and 2484 transitions. Word has length 77 [2021-11-23 02:25:39,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:39,014 INFO L470 AbstractCegarLoop]: Abstraction has 1678 states and 2484 transitions. [2021-11-23 02:25:39,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:25:39,014 INFO L276 IsEmpty]: Start isEmpty. Operand 1678 states and 2484 transitions. [2021-11-23 02:25:39,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 02:25:39,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:39,017 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:39,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:25:39,018 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:39,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:39,018 INFO L85 PathProgramCache]: Analyzing trace with hash -350670590, now seen corresponding path program 1 times [2021-11-23 02:25:39,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:39,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007134975] [2021-11-23 02:25:39,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:39,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:39,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:39,500 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:25:39,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:39,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007134975] [2021-11-23 02:25:39,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007134975] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:39,501 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:39,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:25:39,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131320212] [2021-11-23 02:25:39,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:39,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:25:39,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:39,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:25:39,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:25:39,503 INFO L87 Difference]: Start difference. First operand 1678 states and 2484 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:25:42,557 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:52,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:25:52,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:52,899 INFO L93 Difference]: Finished difference Result 3636 states and 5389 transitions. [2021-11-23 02:25:52,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:25:52,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 76 [2021-11-23 02:25:52,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:52,917 INFO L225 Difference]: With dead ends: 3636 [2021-11-23 02:25:52,917 INFO L226 Difference]: Without dead ends: 1960 [2021-11-23 02:25:52,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:25:52,928 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 2635 mSDsluCounter, 1475 mSDsCounter, 0 mSdLazyCounter, 2278 mSolverCounterSat, 562 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2635 SdHoareTripleChecker+Valid, 2872 SdHoareTripleChecker+Invalid, 2842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 562 IncrementalHoareTripleChecker+Valid, 2278 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:52,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2635 Valid, 2872 Invalid, 2842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [562 Valid, 2278 Invalid, 2 Unknown, 0 Unchecked, 13.1s Time] [2021-11-23 02:25:52,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1960 states. [2021-11-23 02:25:53,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1960 to 1949. [2021-11-23 02:25:53,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1949 states, 1260 states have (on average 1.3753968253968254) internal successors, (1733), 1305 states have internal predecessors, (1733), 570 states have call successors, (570), 118 states have call predecessors, (570), 118 states have return successors, (569), 549 states have call predecessors, (569), 569 states have call successors, (569) [2021-11-23 02:25:53,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1949 states to 1949 states and 2872 transitions. [2021-11-23 02:25:53,068 INFO L78 Accepts]: Start accepts. Automaton has 1949 states and 2872 transitions. Word has length 76 [2021-11-23 02:25:53,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:53,069 INFO L470 AbstractCegarLoop]: Abstraction has 1949 states and 2872 transitions. [2021-11-23 02:25:53,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:25:53,070 INFO L276 IsEmpty]: Start isEmpty. Operand 1949 states and 2872 transitions. [2021-11-23 02:25:53,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 02:25:53,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:53,073 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:53,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:25:53,073 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:53,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:53,074 INFO L85 PathProgramCache]: Analyzing trace with hash -406549128, now seen corresponding path program 1 times [2021-11-23 02:25:53,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:53,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007920600] [2021-11-23 02:25:53,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:53,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:53,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:53,565 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:25:53,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:53,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007920600] [2021-11-23 02:25:53,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007920600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:25:53,565 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:25:53,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:25:53,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99599995] [2021-11-23 02:25:53,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:25:53,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:25:53,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:53,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:25:53,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:25:53,567 INFO L87 Difference]: Start difference. First operand 1949 states and 2872 transitions. Second operand has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:25:56,228 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:00,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:00,671 INFO L93 Difference]: Finished difference Result 3898 states and 5752 transitions. [2021-11-23 02:26:00,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:26:00,671 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 74 [2021-11-23 02:26:00,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:00,685 INFO L225 Difference]: With dead ends: 3898 [2021-11-23 02:26:00,685 INFO L226 Difference]: Without dead ends: 1951 [2021-11-23 02:26:00,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:00,696 INFO L933 BasicCegarLoop]: 1586 mSDtfsCounter, 2727 mSDsluCounter, 890 mSDsCounter, 0 mSdLazyCounter, 1527 mSolverCounterSat, 583 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2727 SdHoareTripleChecker+Valid, 2371 SdHoareTripleChecker+Invalid, 2111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 583 IncrementalHoareTripleChecker+Valid, 1527 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:00,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2727 Valid, 2371 Invalid, 2111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [583 Valid, 1527 Invalid, 1 Unknown, 0 Unchecked, 6.9s Time] [2021-11-23 02:26:00,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1951 states. [2021-11-23 02:26:00,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1951 to 1949. [2021-11-23 02:26:00,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1949 states, 1260 states have (on average 1.3746031746031746) internal successors, (1732), 1305 states have internal predecessors, (1732), 570 states have call successors, (570), 118 states have call predecessors, (570), 118 states have return successors, (569), 549 states have call predecessors, (569), 569 states have call successors, (569) [2021-11-23 02:26:00,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1949 states to 1949 states and 2871 transitions. [2021-11-23 02:26:00,818 INFO L78 Accepts]: Start accepts. Automaton has 1949 states and 2871 transitions. Word has length 74 [2021-11-23 02:26:00,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:00,818 INFO L470 AbstractCegarLoop]: Abstraction has 1949 states and 2871 transitions. [2021-11-23 02:26:00,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 13.0) internal successors, (52), 5 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:26:00,819 INFO L276 IsEmpty]: Start isEmpty. Operand 1949 states and 2871 transitions. [2021-11-23 02:26:00,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:26:00,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:00,821 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:00,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:26:00,822 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:00,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:00,822 INFO L85 PathProgramCache]: Analyzing trace with hash 665924182, now seen corresponding path program 1 times [2021-11-23 02:26:00,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:00,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248405604] [2021-11-23 02:26:00,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:00,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:00,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:01,360 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:26:01,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:01,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248405604] [2021-11-23 02:26:01,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248405604] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:01,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653981790] [2021-11-23 02:26:01,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:01,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:01,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:01,364 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:01,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:26:02,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:02,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:26:02,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:02,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:26:02,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:02,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653981790] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:02,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:02,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:26:02,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825254177] [2021-11-23 02:26:02,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:02,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:26:02,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:02,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:26:02,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:02,841 INFO L87 Difference]: Start difference. First operand 1949 states and 2871 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:26:06,056 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:11,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:11,688 INFO L93 Difference]: Finished difference Result 4408 states and 6507 transitions. [2021-11-23 02:26:11,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:26:11,693 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-11-23 02:26:11,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:11,712 INFO L225 Difference]: With dead ends: 4408 [2021-11-23 02:26:11,712 INFO L226 Difference]: Without dead ends: 2461 [2021-11-23 02:26:11,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:26:11,724 INFO L933 BasicCegarLoop]: 1660 mSDtfsCounter, 922 mSDsluCounter, 3723 mSDsCounter, 0 mSdLazyCounter, 1886 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 924 SdHoareTripleChecker+Valid, 5144 SdHoareTripleChecker+Invalid, 1892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1886 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:11,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [924 Valid, 5144 Invalid, 1892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1886 Invalid, 1 Unknown, 0 Unchecked, 8.6s Time] [2021-11-23 02:26:11,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2461 states. [2021-11-23 02:26:11,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2461 to 2438. [2021-11-23 02:26:11,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2438 states, 1577 states have (on average 1.3760304375396322) internal successors, (2170), 1633 states have internal predecessors, (2170), 713 states have call successors, (713), 146 states have call predecessors, (713), 147 states have return successors, (713), 688 states have call predecessors, (713), 712 states have call successors, (713) [2021-11-23 02:26:11,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2438 states to 2438 states and 3596 transitions. [2021-11-23 02:26:11,900 INFO L78 Accepts]: Start accepts. Automaton has 2438 states and 3596 transitions. Word has length 78 [2021-11-23 02:26:11,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:11,901 INFO L470 AbstractCegarLoop]: Abstraction has 2438 states and 3596 transitions. [2021-11-23 02:26:11,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:26:11,902 INFO L276 IsEmpty]: Start isEmpty. Operand 2438 states and 3596 transitions. [2021-11-23 02:26:11,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 02:26:11,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:11,905 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:11,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:12,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:26:12,132 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:12,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:12,132 INFO L85 PathProgramCache]: Analyzing trace with hash 130212380, now seen corresponding path program 1 times [2021-11-23 02:26:12,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:12,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91211776] [2021-11-23 02:26:12,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:12,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:12,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:12,567 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:26:12,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:12,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91211776] [2021-11-23 02:26:12,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91211776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:12,568 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:12,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:12,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998847276] [2021-11-23 02:26:12,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:12,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:12,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:12,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:12,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:12,570 INFO L87 Difference]: Start difference. First operand 2438 states and 3596 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:15,833 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:23,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:23,737 INFO L93 Difference]: Finished difference Result 4393 states and 6483 transitions. [2021-11-23 02:26:23,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:26:23,738 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 84 [2021-11-23 02:26:23,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:23,749 INFO L225 Difference]: With dead ends: 4393 [2021-11-23 02:26:23,750 INFO L226 Difference]: Without dead ends: 1957 [2021-11-23 02:26:23,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:23,766 INFO L933 BasicCegarLoop]: 1584 mSDtfsCounter, 1935 mSDsluCounter, 1774 mSDsCounter, 0 mSdLazyCounter, 2706 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1935 SdHoareTripleChecker+Valid, 3148 SdHoareTripleChecker+Invalid, 2728 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2706 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:23,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1935 Valid, 3148 Invalid, 2728 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2706 Invalid, 1 Unknown, 0 Unchecked, 10.8s Time] [2021-11-23 02:26:23,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1957 states. [2021-11-23 02:26:23,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1957 to 1947. [2021-11-23 02:26:23,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1947 states, 1259 states have (on average 1.3725178713264496) internal successors, (1728), 1304 states have internal predecessors, (1728), 569 states have call successors, (569), 118 states have call predecessors, (569), 118 states have return successors, (568), 548 states have call predecessors, (568), 568 states have call successors, (568) [2021-11-23 02:26:23,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1947 states to 1947 states and 2865 transitions. [2021-11-23 02:26:23,902 INFO L78 Accepts]: Start accepts. Automaton has 1947 states and 2865 transitions. Word has length 84 [2021-11-23 02:26:23,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:23,903 INFO L470 AbstractCegarLoop]: Abstraction has 1947 states and 2865 transitions. [2021-11-23 02:26:23,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:26:23,903 INFO L276 IsEmpty]: Start isEmpty. Operand 1947 states and 2865 transitions. [2021-11-23 02:26:23,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 02:26:23,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:23,906 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:23,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:26:23,906 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:23,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:23,907 INFO L85 PathProgramCache]: Analyzing trace with hash 29355993, now seen corresponding path program 1 times [2021-11-23 02:26:23,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:23,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788610138] [2021-11-23 02:26:23,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:23,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:24,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:24,375 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:26:24,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:24,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788610138] [2021-11-23 02:26:24,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788610138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:24,376 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:24,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:24,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222620193] [2021-11-23 02:26:24,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:24,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:24,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:24,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:24,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:24,378 INFO L87 Difference]: Start difference. First operand 1947 states and 2865 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:26:27,640 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:38,757 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:38,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:38,975 INFO L93 Difference]: Finished difference Result 3897 states and 5742 transitions. [2021-11-23 02:26:38,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:26:38,977 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 86 [2021-11-23 02:26:38,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:38,989 INFO L225 Difference]: With dead ends: 3897 [2021-11-23 02:26:38,989 INFO L226 Difference]: Without dead ends: 1952 [2021-11-23 02:26:38,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:38,999 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 1895 mSDsluCounter, 1752 mSDsCounter, 0 mSdLazyCounter, 2639 mSolverCounterSat, 17 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1895 SdHoareTripleChecker+Valid, 3106 SdHoareTripleChecker+Invalid, 2658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2639 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:39,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1895 Valid, 3106 Invalid, 2658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2639 Invalid, 2 Unknown, 0 Unchecked, 14.3s Time] [2021-11-23 02:26:39,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1952 states. [2021-11-23 02:26:39,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1952 to 1943. [2021-11-23 02:26:39,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1943 states, 1257 states have (on average 1.3715194908512331) internal successors, (1724), 1302 states have internal predecessors, (1724), 567 states have call successors, (567), 118 states have call predecessors, (567), 118 states have return successors, (566), 546 states have call predecessors, (566), 566 states have call successors, (566) [2021-11-23 02:26:39,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1943 states to 1943 states and 2857 transitions. [2021-11-23 02:26:39,137 INFO L78 Accepts]: Start accepts. Automaton has 1943 states and 2857 transitions. Word has length 86 [2021-11-23 02:26:39,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:39,137 INFO L470 AbstractCegarLoop]: Abstraction has 1943 states and 2857 transitions. [2021-11-23 02:26:39,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:26:39,138 INFO L276 IsEmpty]: Start isEmpty. Operand 1943 states and 2857 transitions. [2021-11-23 02:26:39,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:26:39,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:39,141 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:39,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:26:39,142 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:39,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:39,142 INFO L85 PathProgramCache]: Analyzing trace with hash -482181291, now seen corresponding path program 1 times [2021-11-23 02:26:39,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:39,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393165482] [2021-11-23 02:26:39,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:39,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:39,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:39,584 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:26:39,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:39,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393165482] [2021-11-23 02:26:39,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393165482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:39,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:39,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:39,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410836487] [2021-11-23 02:26:39,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:39,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:39,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:39,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:39,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:39,586 INFO L87 Difference]: Start difference. First operand 1943 states and 2857 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:26:42,312 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:26:49,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:49,881 INFO L93 Difference]: Finished difference Result 3888 states and 5728 transitions. [2021-11-23 02:26:49,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:26:49,883 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 87 [2021-11-23 02:26:49,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:49,894 INFO L225 Difference]: With dead ends: 3888 [2021-11-23 02:26:49,894 INFO L226 Difference]: Without dead ends: 1947 [2021-11-23 02:26:49,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:49,903 INFO L933 BasicCegarLoop]: 1674 mSDtfsCounter, 3245 mSDsluCounter, 940 mSDsCounter, 0 mSdLazyCounter, 1626 mSolverCounterSat, 862 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3245 SdHoareTripleChecker+Valid, 2506 SdHoareTripleChecker+Invalid, 2489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 862 IncrementalHoareTripleChecker+Valid, 1626 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:49,903 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3245 Valid, 2506 Invalid, 2489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [862 Valid, 1626 Invalid, 1 Unknown, 0 Unchecked, 9.9s Time] [2021-11-23 02:26:49,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1947 states. [2021-11-23 02:26:50,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1947 to 1938. [2021-11-23 02:26:50,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1938 states, 1254 states have (on average 1.3700159489633175) internal successors, (1718), 1299 states have internal predecessors, (1718), 565 states have call successors, (565), 118 states have call predecessors, (565), 118 states have return successors, (564), 544 states have call predecessors, (564), 564 states have call successors, (564) [2021-11-23 02:26:50,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1938 states to 1938 states and 2847 transitions. [2021-11-23 02:26:50,055 INFO L78 Accepts]: Start accepts. Automaton has 1938 states and 2847 transitions. Word has length 87 [2021-11-23 02:26:50,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:50,056 INFO L470 AbstractCegarLoop]: Abstraction has 1938 states and 2847 transitions. [2021-11-23 02:26:50,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 4 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-23 02:26:50,056 INFO L276 IsEmpty]: Start isEmpty. Operand 1938 states and 2847 transitions. [2021-11-23 02:26:50,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 02:26:50,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:50,060 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:50,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:26:50,061 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:50,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:50,061 INFO L85 PathProgramCache]: Analyzing trace with hash -18593481, now seen corresponding path program 1 times [2021-11-23 02:26:50,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:50,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784671410] [2021-11-23 02:26:50,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:50,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:50,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:50,514 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:26:50,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:50,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784671410] [2021-11-23 02:26:50,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784671410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:50,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142838806] [2021-11-23 02:26:50,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:50,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:50,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:50,517 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:50,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:26:51,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:51,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 1706 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:26:51,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:51,788 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:26:51,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:51,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142838806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:51,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:51,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 02:26:51,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693534666] [2021-11-23 02:26:51,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:51,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:26:51,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:51,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:26:51,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:51,791 INFO L87 Difference]: Start difference. First operand 1938 states and 2847 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:26:54,745 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:00,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:00,719 INFO L93 Difference]: Finished difference Result 3878 states and 5710 transitions. [2021-11-23 02:27:00,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:00,721 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 88 [2021-11-23 02:27:00,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:00,738 INFO L225 Difference]: With dead ends: 3878 [2021-11-23 02:27:00,738 INFO L226 Difference]: Without dead ends: 1942 [2021-11-23 02:27:00,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:00,748 INFO L933 BasicCegarLoop]: 1473 mSDtfsCounter, 1283 mSDsluCounter, 1874 mSDsCounter, 0 mSdLazyCounter, 1339 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1285 SdHoareTripleChecker+Valid, 3194 SdHoareTripleChecker+Invalid, 1354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1339 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:00,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1285 Valid, 3194 Invalid, 1354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1339 Invalid, 1 Unknown, 0 Unchecked, 8.8s Time] [2021-11-23 02:27:00,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1942 states. [2021-11-23 02:27:00,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1942 to 1932. [2021-11-23 02:27:00,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1932 states, 1251 states have (on average 1.3685051958433254) internal successors, (1712), 1296 states have internal predecessors, (1712), 562 states have call successors, (562), 118 states have call predecessors, (562), 118 states have return successors, (561), 541 states have call predecessors, (561), 561 states have call successors, (561) [2021-11-23 02:27:00,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1932 states to 1932 states and 2835 transitions. [2021-11-23 02:27:00,930 INFO L78 Accepts]: Start accepts. Automaton has 1932 states and 2835 transitions. Word has length 88 [2021-11-23 02:27:00,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:00,931 INFO L470 AbstractCegarLoop]: Abstraction has 1932 states and 2835 transitions. [2021-11-23 02:27:00,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:00,931 INFO L276 IsEmpty]: Start isEmpty. Operand 1932 states and 2835 transitions. [2021-11-23 02:27:00,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 02:27:00,935 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:00,935 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:00,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:01,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:27:01,156 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:01,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:01,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1595976603, now seen corresponding path program 1 times [2021-11-23 02:27:01,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:01,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999131468] [2021-11-23 02:27:01,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:01,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:01,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:01,706 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:27:01,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:01,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999131468] [2021-11-23 02:27:01,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999131468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:01,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:01,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:27:01,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849673324] [2021-11-23 02:27:01,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:01,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:01,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:01,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:01,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:01,709 INFO L87 Difference]: Start difference. First operand 1932 states and 2835 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:04,412 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:12,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:12,854 INFO L93 Difference]: Finished difference Result 3871 states and 5686 transitions. [2021-11-23 02:27:12,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:27:12,856 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 90 [2021-11-23 02:27:12,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:12,866 INFO L225 Difference]: With dead ends: 3871 [2021-11-23 02:27:12,867 INFO L226 Difference]: Without dead ends: 1941 [2021-11-23 02:27:12,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:12,874 INFO L933 BasicCegarLoop]: 1563 mSDtfsCounter, 2250 mSDsluCounter, 1138 mSDsCounter, 0 mSdLazyCounter, 1877 mSolverCounterSat, 241 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2250 SdHoareTripleChecker+Valid, 2558 SdHoareTripleChecker+Invalid, 2119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 1877 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:12,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2250 Valid, 2558 Invalid, 2119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 1877 Invalid, 1 Unknown, 0 Unchecked, 10.9s Time] [2021-11-23 02:27:12,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1941 states. [2021-11-23 02:27:12,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1941 to 1932. [2021-11-23 02:27:12,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1932 states, 1251 states have (on average 1.3677058353317346) internal successors, (1711), 1296 states have internal predecessors, (1711), 562 states have call successors, (562), 118 states have call predecessors, (562), 118 states have return successors, (561), 541 states have call predecessors, (561), 561 states have call successors, (561) [2021-11-23 02:27:13,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1932 states to 1932 states and 2834 transitions. [2021-11-23 02:27:13,004 INFO L78 Accepts]: Start accepts. Automaton has 1932 states and 2834 transitions. Word has length 90 [2021-11-23 02:27:13,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:13,004 INFO L470 AbstractCegarLoop]: Abstraction has 1932 states and 2834 transitions. [2021-11-23 02:27:13,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:27:13,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1932 states and 2834 transitions. [2021-11-23 02:27:13,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-23 02:27:13,008 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:13,008 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:13,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:27:13,009 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:13,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:13,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1759998776, now seen corresponding path program 1 times [2021-11-23 02:27:13,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:13,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995970076] [2021-11-23 02:27:13,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:13,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:13,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:13,551 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:27:13,552 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:13,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995970076] [2021-11-23 02:27:13,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995970076] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:13,552 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:13,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:13,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848158829] [2021-11-23 02:27:13,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:13,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:13,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:13,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:13,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:13,554 INFO L87 Difference]: Start difference. First operand 1932 states and 2834 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:27:16,739 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:20,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:20,045 INFO L93 Difference]: Finished difference Result 3871 states and 5683 transitions. [2021-11-23 02:27:20,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:20,049 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 92 [2021-11-23 02:27:20,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:20,059 INFO L225 Difference]: With dead ends: 3871 [2021-11-23 02:27:20,059 INFO L226 Difference]: Without dead ends: 1941 [2021-11-23 02:27:20,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:20,067 INFO L933 BasicCegarLoop]: 1372 mSDtfsCounter, 565 mSDsluCounter, 3790 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 20 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 4950 SdHoareTripleChecker+Invalid, 839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:20,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 4950 Invalid, 839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 818 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 02:27:20,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1941 states. [2021-11-23 02:27:20,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1941 to 1932. [2021-11-23 02:27:20,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1932 states, 1251 states have (on average 1.3669064748201438) internal successors, (1710), 1296 states have internal predecessors, (1710), 562 states have call successors, (562), 118 states have call predecessors, (562), 118 states have return successors, (561), 541 states have call predecessors, (561), 561 states have call successors, (561) [2021-11-23 02:27:20,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1932 states to 1932 states and 2833 transitions. [2021-11-23 02:27:20,208 INFO L78 Accepts]: Start accepts. Automaton has 1932 states and 2833 transitions. Word has length 92 [2021-11-23 02:27:20,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:20,208 INFO L470 AbstractCegarLoop]: Abstraction has 1932 states and 2833 transitions. [2021-11-23 02:27:20,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:27:20,209 INFO L276 IsEmpty]: Start isEmpty. Operand 1932 states and 2833 transitions. [2021-11-23 02:27:20,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:27:20,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:20,212 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:20,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:27:20,213 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:20,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:20,213 INFO L85 PathProgramCache]: Analyzing trace with hash 387382687, now seen corresponding path program 1 times [2021-11-23 02:27:20,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:20,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845019073] [2021-11-23 02:27:20,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:20,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:20,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:20,624 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:27:20,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:20,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845019073] [2021-11-23 02:27:20,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845019073] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:20,625 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:20,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:20,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399466122] [2021-11-23 02:27:20,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:20,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:20,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:20,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:20,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:20,627 INFO L87 Difference]: Start difference. First operand 1932 states and 2833 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:27:24,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:29,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:29,509 INFO L93 Difference]: Finished difference Result 3865 states and 5675 transitions. [2021-11-23 02:27:29,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:29,512 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 93 [2021-11-23 02:27:29,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:29,519 INFO L225 Difference]: With dead ends: 3865 [2021-11-23 02:27:29,520 INFO L226 Difference]: Without dead ends: 1935 [2021-11-23 02:27:29,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:29,525 INFO L933 BasicCegarLoop]: 1324 mSDtfsCounter, 1764 mSDsluCounter, 2171 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 481 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1765 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 1120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:29,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1765 Valid, 3376 Invalid, 1120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 638 Invalid, 1 Unknown, 0 Unchecked, 8.7s Time] [2021-11-23 02:27:29,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1935 states. [2021-11-23 02:27:29,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1935 to 1930. [2021-11-23 02:27:29,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1930 states, 1250 states have (on average 1.3664) internal successors, (1708), 1295 states have internal predecessors, (1708), 561 states have call successors, (561), 118 states have call predecessors, (561), 118 states have return successors, (560), 540 states have call predecessors, (560), 560 states have call successors, (560) [2021-11-23 02:27:29,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1930 states to 1930 states and 2829 transitions. [2021-11-23 02:27:29,635 INFO L78 Accepts]: Start accepts. Automaton has 1930 states and 2829 transitions. Word has length 93 [2021-11-23 02:27:29,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:29,636 INFO L470 AbstractCegarLoop]: Abstraction has 1930 states and 2829 transitions. [2021-11-23 02:27:29,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:27:29,636 INFO L276 IsEmpty]: Start isEmpty. Operand 1930 states and 2829 transitions. [2021-11-23 02:27:29,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:27:29,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:29,639 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:29,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:27:29,640 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:29,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:29,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1729204075, now seen corresponding path program 1 times [2021-11-23 02:27:29,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:29,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867749465] [2021-11-23 02:27:29,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:29,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:29,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:30,027 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:27:30,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:30,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867749465] [2021-11-23 02:27:30,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867749465] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:30,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:30,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:30,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900039855] [2021-11-23 02:27:30,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:30,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:30,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:30,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:30,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:30,030 INFO L87 Difference]: Start difference. First operand 1930 states and 2829 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:27:33,185 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:36,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:36,924 INFO L93 Difference]: Finished difference Result 3867 states and 5673 transitions. [2021-11-23 02:27:36,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:36,930 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 94 [2021-11-23 02:27:36,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:36,940 INFO L225 Difference]: With dead ends: 3867 [2021-11-23 02:27:36,940 INFO L226 Difference]: Without dead ends: 1939 [2021-11-23 02:27:36,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:36,945 INFO L933 BasicCegarLoop]: 1367 mSDtfsCounter, 887 mSDsluCounter, 2609 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 235 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 887 SdHoareTripleChecker+Valid, 3832 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:36,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [887 Valid, 3832 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 577 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2021-11-23 02:27:36,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1939 states. [2021-11-23 02:27:37,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1939 to 1930. [2021-11-23 02:27:37,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1930 states, 1250 states have (on average 1.3656) internal successors, (1707), 1295 states have internal predecessors, (1707), 561 states have call successors, (561), 118 states have call predecessors, (561), 118 states have return successors, (560), 540 states have call predecessors, (560), 560 states have call successors, (560) [2021-11-23 02:27:37,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1930 states to 1930 states and 2828 transitions. [2021-11-23 02:27:37,072 INFO L78 Accepts]: Start accepts. Automaton has 1930 states and 2828 transitions. Word has length 94 [2021-11-23 02:27:37,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:37,073 INFO L470 AbstractCegarLoop]: Abstraction has 1930 states and 2828 transitions. [2021-11-23 02:27:37,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-23 02:27:37,073 INFO L276 IsEmpty]: Start isEmpty. Operand 1930 states and 2828 transitions. [2021-11-23 02:27:37,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:27:37,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:37,077 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:37,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:27:37,077 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:37,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:37,078 INFO L85 PathProgramCache]: Analyzing trace with hash 380702518, now seen corresponding path program 1 times [2021-11-23 02:27:37,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:37,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073825880] [2021-11-23 02:27:37,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:37,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:37,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:37,504 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:27:37,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:37,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073825880] [2021-11-23 02:27:37,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073825880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:37,504 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:37,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:37,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840498734] [2021-11-23 02:27:37,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:37,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:37,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:37,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:37,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:37,506 INFO L87 Difference]: Start difference. First operand 1930 states and 2828 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:27:41,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:27:47,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:47,163 INFO L93 Difference]: Finished difference Result 3861 states and 5665 transitions. [2021-11-23 02:27:47,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:27:47,165 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 95 [2021-11-23 02:27:47,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:47,174 INFO L225 Difference]: With dead ends: 3861 [2021-11-23 02:27:47,174 INFO L226 Difference]: Without dead ends: 1933 [2021-11-23 02:27:47,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:47,179 INFO L933 BasicCegarLoop]: 1319 mSDtfsCounter, 1751 mSDsluCounter, 2165 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 479 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1752 SdHoareTripleChecker+Valid, 3366 SdHoareTripleChecker+Invalid, 1118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 479 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:47,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1752 Valid, 3366 Invalid, 1118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [479 Valid, 638 Invalid, 1 Unknown, 0 Unchecked, 9.4s Time] [2021-11-23 02:27:47,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1933 states. [2021-11-23 02:27:47,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1933 to 1928. [2021-11-23 02:27:47,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1928 states, 1249 states have (on average 1.3650920736589272) internal successors, (1705), 1294 states have internal predecessors, (1705), 560 states have call successors, (560), 118 states have call predecessors, (560), 118 states have return successors, (559), 539 states have call predecessors, (559), 559 states have call successors, (559) [2021-11-23 02:27:47,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1928 states to 1928 states and 2824 transitions. [2021-11-23 02:27:47,321 INFO L78 Accepts]: Start accepts. Automaton has 1928 states and 2824 transitions. Word has length 95 [2021-11-23 02:27:47,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:47,322 INFO L470 AbstractCegarLoop]: Abstraction has 1928 states and 2824 transitions. [2021-11-23 02:27:47,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:27:47,322 INFO L276 IsEmpty]: Start isEmpty. Operand 1928 states and 2824 transitions. [2021-11-23 02:27:47,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 02:27:47,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:47,326 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:47,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:27:47,326 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:47,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:47,327 INFO L85 PathProgramCache]: Analyzing trace with hash 1958783896, now seen corresponding path program 1 times [2021-11-23 02:27:47,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:47,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408660574] [2021-11-23 02:27:47,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:47,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:47,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:47,987 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:27:47,988 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:47,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408660574] [2021-11-23 02:27:47,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408660574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:47,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:47,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:27:47,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840705240] [2021-11-23 02:27:47,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:47,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:47,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:47,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:47,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:27:47,990 INFO L87 Difference]: Start difference. First operand 1928 states and 2824 transitions. Second operand has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:27:50,749 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:03,166 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:03,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:03,390 INFO L93 Difference]: Finished difference Result 3859 states and 5660 transitions. [2021-11-23 02:28:03,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:28:03,392 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 96 [2021-11-23 02:28:03,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:03,402 INFO L225 Difference]: With dead ends: 3859 [2021-11-23 02:28:03,402 INFO L226 Difference]: Without dead ends: 1933 [2021-11-23 02:28:03,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:28:03,409 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 2227 mSDsluCounter, 1139 mSDsCounter, 0 mSdLazyCounter, 1850 mSolverCounterSat, 262 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2227 SdHoareTripleChecker+Valid, 2537 SdHoareTripleChecker+Invalid, 2114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 1850 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:03,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2227 Valid, 2537 Invalid, 2114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 1850 Invalid, 2 Unknown, 0 Unchecked, 15.0s Time] [2021-11-23 02:28:03,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1933 states. [2021-11-23 02:28:03,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1933 to 1924. [2021-11-23 02:28:03,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1924 states, 1247 states have (on average 1.3640737770649558) internal successors, (1701), 1292 states have internal predecessors, (1701), 558 states have call successors, (558), 118 states have call predecessors, (558), 118 states have return successors, (557), 537 states have call predecessors, (557), 557 states have call successors, (557) [2021-11-23 02:28:03,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1924 states to 1924 states and 2816 transitions. [2021-11-23 02:28:03,535 INFO L78 Accepts]: Start accepts. Automaton has 1924 states and 2816 transitions. Word has length 96 [2021-11-23 02:28:03,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:03,536 INFO L470 AbstractCegarLoop]: Abstraction has 1924 states and 2816 transitions. [2021-11-23 02:28:03,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.0) internal successors, (54), 6 states have internal predecessors, (54), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:28:03,536 INFO L276 IsEmpty]: Start isEmpty. Operand 1924 states and 2816 transitions. [2021-11-23 02:28:03,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 02:28:03,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:03,539 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:03,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:28:03,540 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:03,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:03,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1562537144, now seen corresponding path program 1 times [2021-11-23 02:28:03,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:03,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756833711] [2021-11-23 02:28:03,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:03,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:03,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:04,077 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:28:04,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:04,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756833711] [2021-11-23 02:28:04,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756833711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:04,078 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:04,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:28:04,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716996580] [2021-11-23 02:28:04,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:04,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:28:04,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:04,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:28:04,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:28:04,080 INFO L87 Difference]: Start difference. First operand 1924 states and 2816 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:28:07,061 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:19,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:19,514 INFO L93 Difference]: Finished difference Result 3851 states and 5644 transitions. [2021-11-23 02:28:19,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:28:19,517 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 97 [2021-11-23 02:28:19,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:19,528 INFO L225 Difference]: With dead ends: 3851 [2021-11-23 02:28:19,528 INFO L226 Difference]: Without dead ends: 1929 [2021-11-23 02:28:19,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:28:19,534 INFO L933 BasicCegarLoop]: 1652 mSDtfsCounter, 2020 mSDsluCounter, 1857 mSDsCounter, 0 mSdLazyCounter, 2835 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2020 SdHoareTripleChecker+Valid, 3290 SdHoareTripleChecker+Invalid, 2857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2835 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:19,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2020 Valid, 3290 Invalid, 2857 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2835 Invalid, 1 Unknown, 0 Unchecked, 15.0s Time] [2021-11-23 02:28:19,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1929 states. [2021-11-23 02:28:19,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1929 to 1920. [2021-11-23 02:28:19,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1920 states, 1245 states have (on average 1.3630522088353414) internal successors, (1697), 1290 states have internal predecessors, (1697), 556 states have call successors, (556), 118 states have call predecessors, (556), 118 states have return successors, (555), 535 states have call predecessors, (555), 555 states have call successors, (555) [2021-11-23 02:28:19,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1920 states to 1920 states and 2808 transitions. [2021-11-23 02:28:19,651 INFO L78 Accepts]: Start accepts. Automaton has 1920 states and 2808 transitions. Word has length 97 [2021-11-23 02:28:19,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:19,651 INFO L470 AbstractCegarLoop]: Abstraction has 1920 states and 2808 transitions. [2021-11-23 02:28:19,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 4 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:28:19,652 INFO L276 IsEmpty]: Start isEmpty. Operand 1920 states and 2808 transitions. [2021-11-23 02:28:19,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 02:28:19,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:19,655 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:19,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:28:19,656 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:19,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:19,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1876351094, now seen corresponding path program 1 times [2021-11-23 02:28:19,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:19,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603355883] [2021-11-23 02:28:19,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:19,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:20,130 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:28:20,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:20,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603355883] [2021-11-23 02:28:20,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603355883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:20,130 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:20,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:28:20,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570220316] [2021-11-23 02:28:20,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:20,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:20,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:20,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:20,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:28:20,132 INFO L87 Difference]: Start difference. First operand 1920 states and 2808 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:23,017 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:26,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:26,397 INFO L93 Difference]: Finished difference Result 3844 states and 5627 transitions. [2021-11-23 02:28:26,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:28:26,403 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 98 [2021-11-23 02:28:26,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:26,412 INFO L225 Difference]: With dead ends: 3844 [2021-11-23 02:28:26,412 INFO L226 Difference]: Without dead ends: 1926 [2021-11-23 02:28:26,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:28:26,420 INFO L933 BasicCegarLoop]: 1325 mSDtfsCounter, 1264 mSDsluCounter, 2438 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1265 SdHoareTripleChecker+Valid, 3609 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:26,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1265 Valid, 3609 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 730 Invalid, 1 Unknown, 0 Unchecked, 6.1s Time] [2021-11-23 02:28:26,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1926 states. [2021-11-23 02:28:26,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1926 to 1918. [2021-11-23 02:28:26,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1918 states, 1244 states have (on average 1.362540192926045) internal successors, (1695), 1289 states have internal predecessors, (1695), 555 states have call successors, (555), 118 states have call predecessors, (555), 118 states have return successors, (554), 534 states have call predecessors, (554), 554 states have call successors, (554) [2021-11-23 02:28:26,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1918 states to 1918 states and 2804 transitions. [2021-11-23 02:28:26,558 INFO L78 Accepts]: Start accepts. Automaton has 1918 states and 2804 transitions. Word has length 98 [2021-11-23 02:28:26,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:26,558 INFO L470 AbstractCegarLoop]: Abstraction has 1918 states and 2804 transitions. [2021-11-23 02:28:26,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:26,559 INFO L276 IsEmpty]: Start isEmpty. Operand 1918 states and 2804 transitions. [2021-11-23 02:28:26,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 02:28:26,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:26,562 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:26,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:28:26,563 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:26,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:26,563 INFO L85 PathProgramCache]: Analyzing trace with hash 639090776, now seen corresponding path program 1 times [2021-11-23 02:28:26,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:26,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928108281] [2021-11-23 02:28:26,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:26,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:26,985 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:28:26,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:26,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928108281] [2021-11-23 02:28:26,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928108281] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:26,986 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:26,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:28:26,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653834992] [2021-11-23 02:28:26,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:26,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:26,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:26,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:26,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:28:26,988 INFO L87 Difference]: Start difference. First operand 1918 states and 2804 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:29,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:33,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:33,562 INFO L93 Difference]: Finished difference Result 3840 states and 5619 transitions. [2021-11-23 02:28:33,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:28:33,568 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 99 [2021-11-23 02:28:33,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:33,575 INFO L225 Difference]: With dead ends: 3840 [2021-11-23 02:28:33,575 INFO L226 Difference]: Without dead ends: 1924 [2021-11-23 02:28:33,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:28:33,581 INFO L933 BasicCegarLoop]: 1447 mSDtfsCounter, 1255 mSDsluCounter, 2821 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1257 SdHoareTripleChecker+Valid, 4096 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:33,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1257 Valid, 4096 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 814 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 02:28:33,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2021-11-23 02:28:33,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 1916. [2021-11-23 02:28:33,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1916 states, 1243 states have (on average 1.3620273531777956) internal successors, (1693), 1288 states have internal predecessors, (1693), 554 states have call successors, (554), 118 states have call predecessors, (554), 118 states have return successors, (553), 533 states have call predecessors, (553), 553 states have call successors, (553) [2021-11-23 02:28:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1916 states to 1916 states and 2800 transitions. [2021-11-23 02:28:33,711 INFO L78 Accepts]: Start accepts. Automaton has 1916 states and 2800 transitions. Word has length 99 [2021-11-23 02:28:33,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:33,712 INFO L470 AbstractCegarLoop]: Abstraction has 1916 states and 2800 transitions. [2021-11-23 02:28:33,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:33,712 INFO L276 IsEmpty]: Start isEmpty. Operand 1916 states and 2800 transitions. [2021-11-23 02:28:33,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 02:28:33,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:33,715 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:33,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:28:33,716 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:33,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:33,717 INFO L85 PathProgramCache]: Analyzing trace with hash 667741080, now seen corresponding path program 1 times [2021-11-23 02:28:33,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:33,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716971813] [2021-11-23 02:28:33,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:33,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:33,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:34,199 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:28:34,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:34,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716971813] [2021-11-23 02:28:34,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716971813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:34,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:34,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:28:34,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257035805] [2021-11-23 02:28:34,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:34,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:34,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:34,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:34,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:28:34,202 INFO L87 Difference]: Start difference. First operand 1916 states and 2800 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:37,002 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:44,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:44,192 INFO L93 Difference]: Finished difference Result 3836 states and 5611 transitions. [2021-11-23 02:28:44,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:28:44,197 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 100 [2021-11-23 02:28:44,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:44,206 INFO L225 Difference]: With dead ends: 3836 [2021-11-23 02:28:44,206 INFO L226 Difference]: Without dead ends: 1922 [2021-11-23 02:28:44,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:28:44,214 INFO L933 BasicCegarLoop]: 1317 mSDtfsCounter, 1974 mSDsluCounter, 1911 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 536 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1975 SdHoareTripleChecker+Valid, 3113 SdHoareTripleChecker+Invalid, 1148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:44,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1975 Valid, 3113 Invalid, 1148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 611 Invalid, 1 Unknown, 0 Unchecked, 9.8s Time] [2021-11-23 02:28:44,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1922 states. [2021-11-23 02:28:44,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1922 to 1914. [2021-11-23 02:28:44,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1914 states, 1242 states have (on average 1.3615136876006442) internal successors, (1691), 1287 states have internal predecessors, (1691), 553 states have call successors, (553), 118 states have call predecessors, (553), 118 states have return successors, (552), 532 states have call predecessors, (552), 552 states have call successors, (552) [2021-11-23 02:28:44,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1914 states to 1914 states and 2796 transitions. [2021-11-23 02:28:44,349 INFO L78 Accepts]: Start accepts. Automaton has 1914 states and 2796 transitions. Word has length 100 [2021-11-23 02:28:44,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:44,350 INFO L470 AbstractCegarLoop]: Abstraction has 1914 states and 2796 transitions. [2021-11-23 02:28:44,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:44,350 INFO L276 IsEmpty]: Start isEmpty. Operand 1914 states and 2796 transitions. [2021-11-23 02:28:44,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 02:28:44,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:44,353 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:44,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:28:44,353 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:44,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:44,354 INFO L85 PathProgramCache]: Analyzing trace with hash 1120343394, now seen corresponding path program 1 times [2021-11-23 02:28:44,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:44,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975745235] [2021-11-23 02:28:44,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:44,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:44,758 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:28:44,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:44,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975745235] [2021-11-23 02:28:44,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975745235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:44,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:44,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:28:44,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187051693] [2021-11-23 02:28:44,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:44,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:44,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:44,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:44,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:28:44,761 INFO L87 Difference]: Start difference. First operand 1914 states and 2796 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:47,449 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:51,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:51,195 INFO L93 Difference]: Finished difference Result 3832 states and 5603 transitions. [2021-11-23 02:28:51,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:28:51,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 101 [2021-11-23 02:28:51,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:51,212 INFO L225 Difference]: With dead ends: 3832 [2021-11-23 02:28:51,212 INFO L226 Difference]: Without dead ends: 1920 [2021-11-23 02:28:51,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:28:51,219 INFO L933 BasicCegarLoop]: 1439 mSDtfsCounter, 1246 mSDsluCounter, 2812 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1248 SdHoareTripleChecker+Valid, 4080 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:51,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1248 Valid, 4080 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 814 Invalid, 1 Unknown, 0 Unchecked, 6.2s Time] [2021-11-23 02:28:51,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1920 states. [2021-11-23 02:28:51,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1920 to 1912. [2021-11-23 02:28:51,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1912 states, 1241 states have (on average 1.3609991941982273) internal successors, (1689), 1286 states have internal predecessors, (1689), 552 states have call successors, (552), 118 states have call predecessors, (552), 118 states have return successors, (551), 531 states have call predecessors, (551), 551 states have call successors, (551) [2021-11-23 02:28:51,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 2792 transitions. [2021-11-23 02:28:51,320 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 2792 transitions. Word has length 101 [2021-11-23 02:28:51,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:51,321 INFO L470 AbstractCegarLoop]: Abstraction has 1912 states and 2792 transitions. [2021-11-23 02:28:51,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:28:51,321 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 2792 transitions. [2021-11-23 02:28:51,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:28:51,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:51,325 INFO L514 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:51,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:28:51,325 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:51,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:51,326 INFO L85 PathProgramCache]: Analyzing trace with hash -269604810, now seen corresponding path program 1 times [2021-11-23 02:28:51,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:51,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524402183] [2021-11-23 02:28:51,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:51,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:51,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:51,689 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 02:28:51,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:51,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524402183] [2021-11-23 02:28:51,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524402183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:51,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:28:51,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:28:51,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799262465] [2021-11-23 02:28:51,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:51,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:51,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:51,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:51,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:28:51,692 INFO L87 Difference]: Start difference. First operand 1912 states and 2792 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 02:28:54,918 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:28:56,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:56,780 INFO L93 Difference]: Finished difference Result 2629 states and 3849 transitions. [2021-11-23 02:28:56,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:28:56,787 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 102 [2021-11-23 02:28:56,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:56,802 INFO L225 Difference]: With dead ends: 2629 [2021-11-23 02:28:56,803 INFO L226 Difference]: Without dead ends: 2627 [2021-11-23 02:28:56,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:28:56,806 INFO L933 BasicCegarLoop]: 1807 mSDtfsCounter, 1408 mSDsluCounter, 4900 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1410 SdHoareTripleChecker+Valid, 6462 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:56,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1410 Valid, 6462 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 360 Invalid, 1 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:28:56,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2627 states. [2021-11-23 02:28:56,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2627 to 1993. [2021-11-23 02:28:56,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1993 states, 1294 states have (on average 1.3593508500772797) internal successors, (1759), 1340 states have internal predecessors, (1759), 572 states have call successors, (572), 126 states have call predecessors, (572), 126 states have return successors, (571), 550 states have call predecessors, (571), 571 states have call successors, (571) [2021-11-23 02:28:56,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1993 states to 1993 states and 2902 transitions. [2021-11-23 02:28:56,956 INFO L78 Accepts]: Start accepts. Automaton has 1993 states and 2902 transitions. Word has length 102 [2021-11-23 02:28:56,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:56,957 INFO L470 AbstractCegarLoop]: Abstraction has 1993 states and 2902 transitions. [2021-11-23 02:28:56,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 02:28:56,957 INFO L276 IsEmpty]: Start isEmpty. Operand 1993 states and 2902 transitions. [2021-11-23 02:28:56,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 02:28:56,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:56,963 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:56,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:28:56,963 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:56,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:56,964 INFO L85 PathProgramCache]: Analyzing trace with hash -304892739, now seen corresponding path program 1 times [2021-11-23 02:28:56,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:56,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329098033] [2021-11-23 02:28:56,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:56,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:57,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:57,781 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:28:57,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:57,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329098033] [2021-11-23 02:28:57,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329098033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:57,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617653883] [2021-11-23 02:28:57,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:57,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:57,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:57,792 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:57,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:28:58,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:58,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1942 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:28:58,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:59,445 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 02:28:59,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:28:59,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617653883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:28:59,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:28:59,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-23 02:28:59,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068773428] [2021-11-23 02:28:59,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:28:59,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:28:59,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:59,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:28:59,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:28:59,448 INFO L87 Difference]: Start difference. First operand 1993 states and 2902 transitions. Second operand has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:29:02,827 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:08,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:08,861 INFO L93 Difference]: Finished difference Result 3988 states and 5815 transitions. [2021-11-23 02:29:08,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:08,863 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 169 [2021-11-23 02:29:08,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:08,872 INFO L225 Difference]: With dead ends: 3988 [2021-11-23 02:29:08,873 INFO L226 Difference]: Without dead ends: 1997 [2021-11-23 02:29:08,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:29:08,881 INFO L933 BasicCegarLoop]: 1292 mSDtfsCounter, 1075 mSDsluCounter, 2521 mSDsCounter, 0 mSdLazyCounter, 1838 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1076 SdHoareTripleChecker+Valid, 3626 SdHoareTripleChecker+Invalid, 1846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1838 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:08,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1076 Valid, 3626 Invalid, 1846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1838 Invalid, 1 Unknown, 0 Unchecked, 9.2s Time] [2021-11-23 02:29:08,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1997 states. [2021-11-23 02:29:09,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1997 to 1991. [2021-11-23 02:29:09,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1991 states, 1293 states have (on average 1.3588553750966743) internal successors, (1757), 1339 states have internal predecessors, (1757), 571 states have call successors, (571), 126 states have call predecessors, (571), 126 states have return successors, (570), 549 states have call predecessors, (570), 570 states have call successors, (570) [2021-11-23 02:29:09,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 2898 transitions. [2021-11-23 02:29:09,026 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 2898 transitions. Word has length 169 [2021-11-23 02:29:09,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:09,027 INFO L470 AbstractCegarLoop]: Abstraction has 1991 states and 2898 transitions. [2021-11-23 02:29:09,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.6) internal successors, (108), 5 states have internal predecessors, (108), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:29:09,028 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 2898 transitions. [2021-11-23 02:29:09,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-23 02:29:09,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:09,034 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:09,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:09,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:09,257 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:09,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:09,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1119017180, now seen corresponding path program 1 times [2021-11-23 02:29:09,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:09,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654248362] [2021-11-23 02:29:09,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:09,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:09,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:09,947 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:29:09,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:09,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654248362] [2021-11-23 02:29:09,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654248362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:09,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216442881] [2021-11-23 02:29:09,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:09,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:09,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:09,948 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:09,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:29:10,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:10,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 1936 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:29:10,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:29:11,662 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:29:11,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216442881] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:11,662 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:29:11,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:29:11,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212457760] [2021-11-23 02:29:11,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:11,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:29:11,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:11,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:29:11,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:29:11,664 INFO L87 Difference]: Start difference. First operand 1991 states and 2898 transitions. Second operand has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:29:14,762 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:21,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:21,816 INFO L93 Difference]: Finished difference Result 3985 states and 5807 transitions. [2021-11-23 02:29:21,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:21,819 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 168 [2021-11-23 02:29:21,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:21,827 INFO L225 Difference]: With dead ends: 3985 [2021-11-23 02:29:21,827 INFO L226 Difference]: Without dead ends: 1984 [2021-11-23 02:29:21,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:29:21,833 INFO L933 BasicCegarLoop]: 1610 mSDtfsCounter, 587 mSDsluCounter, 2676 mSDsCounter, 0 mSdLazyCounter, 1364 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 588 SdHoareTripleChecker+Valid, 4084 SdHoareTripleChecker+Invalid, 1369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1364 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:21,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [588 Valid, 4084 Invalid, 1369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1364 Invalid, 1 Unknown, 0 Unchecked, 9.8s Time] [2021-11-23 02:29:21,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2021-11-23 02:29:21,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1981. [2021-11-23 02:29:21,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1981 states, 1286 states have (on average 1.3569206842923796) internal successors, (1745), 1332 states have internal predecessors, (1745), 568 states have call successors, (568), 126 states have call predecessors, (568), 126 states have return successors, (567), 546 states have call predecessors, (567), 567 states have call successors, (567) [2021-11-23 02:29:21,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2880 transitions. [2021-11-23 02:29:21,979 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2880 transitions. Word has length 168 [2021-11-23 02:29:21,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:21,980 INFO L470 AbstractCegarLoop]: Abstraction has 1981 states and 2880 transitions. [2021-11-23 02:29:21,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.0) internal successors, (105), 5 states have internal predecessors, (105), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:29:21,980 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2880 transitions. [2021-11-23 02:29:21,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 02:29:21,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:21,987 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:22,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:22,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:29:22,208 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:22,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:22,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1553153241, now seen corresponding path program 1 times [2021-11-23 02:29:22,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:22,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626598286] [2021-11-23 02:29:22,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:22,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:22,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:22,959 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 02:29:22,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:22,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626598286] [2021-11-23 02:29:22,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626598286] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:22,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223790206] [2021-11-23 02:29:22,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:22,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:22,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:22,968 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:22,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:29:23,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:23,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 1938 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:29:23,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-23 02:29:24,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:29:24,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223790206] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:24,650 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:29:24,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-23 02:29:24,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909535707] [2021-11-23 02:29:24,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:24,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:29:24,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:24,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:29:24,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:29:24,652 INFO L87 Difference]: Start difference. First operand 1981 states and 2880 transitions. Second operand has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:29:27,883 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:36,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:36,192 INFO L93 Difference]: Finished difference Result 3959 states and 5764 transitions. [2021-11-23 02:29:36,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:29:36,199 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 169 [2021-11-23 02:29:36,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:36,207 INFO L225 Difference]: With dead ends: 3959 [2021-11-23 02:29:36,207 INFO L226 Difference]: Without dead ends: 1980 [2021-11-23 02:29:36,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 168 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:29:36,214 INFO L933 BasicCegarLoop]: 1631 mSDtfsCounter, 731 mSDsluCounter, 3693 mSDsCounter, 0 mSdLazyCounter, 1743 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 732 SdHoareTripleChecker+Valid, 5059 SdHoareTripleChecker+Invalid, 1748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1743 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:36,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [732 Valid, 5059 Invalid, 1748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1743 Invalid, 1 Unknown, 0 Unchecked, 11.2s Time] [2021-11-23 02:29:36,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1980 states. [2021-11-23 02:29:36,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1980 to 1978. [2021-11-23 02:29:36,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1978 states, 1284 states have (on average 1.3559190031152648) internal successors, (1741), 1330 states have internal predecessors, (1741), 567 states have call successors, (567), 126 states have call predecessors, (567), 126 states have return successors, (566), 545 states have call predecessors, (566), 566 states have call successors, (566) [2021-11-23 02:29:36,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1978 states to 1978 states and 2874 transitions. [2021-11-23 02:29:36,350 INFO L78 Accepts]: Start accepts. Automaton has 1978 states and 2874 transitions. Word has length 169 [2021-11-23 02:29:36,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:36,351 INFO L470 AbstractCegarLoop]: Abstraction has 1978 states and 2874 transitions. [2021-11-23 02:29:36,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 3 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:29:36,351 INFO L276 IsEmpty]: Start isEmpty. Operand 1978 states and 2874 transitions. [2021-11-23 02:29:36,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-11-23 02:29:36,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:36,358 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:36,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:36,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:29:36,584 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:36,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:36,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1737239169, now seen corresponding path program 1 times [2021-11-23 02:29:36,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:36,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297072755] [2021-11-23 02:29:36,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:36,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:36,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:37,294 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-23 02:29:37,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:37,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297072755] [2021-11-23 02:29:37,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297072755] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:37,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:29:37,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:29:37,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8766730] [2021-11-23 02:29:37,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:37,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:29:37,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:37,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:29:37,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:29:37,297 INFO L87 Difference]: Start difference. First operand 1978 states and 2874 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:29:40,373 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:29:57,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:57,009 INFO L93 Difference]: Finished difference Result 4328 states and 6278 transitions. [2021-11-23 02:29:57,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:29:57,013 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 175 [2021-11-23 02:29:57,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:57,021 INFO L225 Difference]: With dead ends: 4328 [2021-11-23 02:29:57,021 INFO L226 Difference]: Without dead ends: 2352 [2021-11-23 02:29:57,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:29:57,031 INFO L933 BasicCegarLoop]: 2100 mSDtfsCounter, 1982 mSDsluCounter, 3596 mSDsCounter, 0 mSdLazyCounter, 3298 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1982 SdHoareTripleChecker+Valid, 5329 SdHoareTripleChecker+Invalid, 3316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 3298 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:57,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1982 Valid, 5329 Invalid, 3316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 3298 Invalid, 1 Unknown, 0 Unchecked, 19.2s Time] [2021-11-23 02:29:57,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2352 states. [2021-11-23 02:29:57,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2352 to 2350. [2021-11-23 02:29:57,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2350 states, 1531 states have (on average 1.348138471587198) internal successors, (2064), 1587 states have internal predecessors, (2064), 666 states have call successors, (666), 152 states have call predecessors, (666), 152 states have return successors, (665), 640 states have call predecessors, (665), 665 states have call successors, (665) [2021-11-23 02:29:57,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 3395 transitions. [2021-11-23 02:29:57,204 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 3395 transitions. Word has length 175 [2021-11-23 02:29:57,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:57,205 INFO L470 AbstractCegarLoop]: Abstraction has 2350 states and 3395 transitions. [2021-11-23 02:29:57,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:29:57,205 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 3395 transitions. [2021-11-23 02:29:57,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-23 02:29:57,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:57,211 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:29:57,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-23 02:29:57,211 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:57,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:57,212 INFO L85 PathProgramCache]: Analyzing trace with hash -771103141, now seen corresponding path program 1 times [2021-11-23 02:29:57,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:57,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910517399] [2021-11-23 02:29:57,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:57,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:57,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:57,969 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-23 02:29:57,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:57,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910517399] [2021-11-23 02:29:57,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910517399] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:29:57,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:29:57,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:29:57,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050690330] [2021-11-23 02:29:57,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:29:57,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:29:57,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:57,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:29:57,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:29:57,971 INFO L87 Difference]: Start difference. First operand 2350 states and 3395 transitions. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:30:00,588 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:15,297 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:15,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:15,550 INFO L93 Difference]: Finished difference Result 4698 states and 6798 transitions. [2021-11-23 02:30:15,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:30:15,554 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) Word has length 177 [2021-11-23 02:30:15,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:15,563 INFO L225 Difference]: With dead ends: 4698 [2021-11-23 02:30:15,563 INFO L226 Difference]: Without dead ends: 2350 [2021-11-23 02:30:15,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:30:15,572 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 2914 mSDsluCounter, 844 mSDsCounter, 0 mSdLazyCounter, 1470 mSolverCounterSat, 778 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2914 SdHoareTripleChecker+Valid, 2247 SdHoareTripleChecker+Invalid, 2250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 778 IncrementalHoareTripleChecker+Valid, 1470 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:15,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2914 Valid, 2247 Invalid, 2250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [778 Valid, 1470 Invalid, 2 Unknown, 0 Unchecked, 17.0s Time] [2021-11-23 02:30:15,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2021-11-23 02:30:15,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2346. [2021-11-23 02:30:15,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2346 states, 1529 states have (on average 1.3472858077174623) internal successors, (2060), 1585 states have internal predecessors, (2060), 664 states have call successors, (664), 152 states have call predecessors, (664), 152 states have return successors, (663), 638 states have call predecessors, (663), 663 states have call successors, (663) [2021-11-23 02:30:15,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2346 states to 2346 states and 3387 transitions. [2021-11-23 02:30:15,779 INFO L78 Accepts]: Start accepts. Automaton has 2346 states and 3387 transitions. Word has length 177 [2021-11-23 02:30:15,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:15,779 INFO L470 AbstractCegarLoop]: Abstraction has 2346 states and 3387 transitions. [2021-11-23 02:30:15,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 4 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:30:15,780 INFO L276 IsEmpty]: Start isEmpty. Operand 2346 states and 3387 transitions. [2021-11-23 02:30:15,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 02:30:15,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:15,784 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:15,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-23 02:30:15,785 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:15,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:15,785 INFO L85 PathProgramCache]: Analyzing trace with hash 447637376, now seen corresponding path program 1 times [2021-11-23 02:30:15,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:15,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668186106] [2021-11-23 02:30:15,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:15,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:15,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:16,309 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 02:30:16,309 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:16,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668186106] [2021-11-23 02:30:16,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668186106] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:16,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:30:16,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:30:16,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173174276] [2021-11-23 02:30:16,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:16,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:16,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:16,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:16,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:30:16,311 INFO L87 Difference]: Start difference. First operand 2346 states and 3387 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:30:19,621 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:24,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:24,456 INFO L93 Difference]: Finished difference Result 4689 states and 6776 transitions. [2021-11-23 02:30:24,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:30:24,468 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 178 [2021-11-23 02:30:24,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:24,476 INFO L225 Difference]: With dead ends: 4689 [2021-11-23 02:30:24,476 INFO L226 Difference]: Without dead ends: 2345 [2021-11-23 02:30:24,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:30:24,482 INFO L933 BasicCegarLoop]: 1621 mSDtfsCounter, 722 mSDsluCounter, 3889 mSDsCounter, 0 mSdLazyCounter, 903 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 722 SdHoareTripleChecker+Valid, 5272 SdHoareTripleChecker+Invalid, 920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 903 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:24,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [722 Valid, 5272 Invalid, 920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 903 Invalid, 1 Unknown, 0 Unchecked, 7.9s Time] [2021-11-23 02:30:24,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2345 states. [2021-11-23 02:30:24,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2345 to 2343. [2021-11-23 02:30:24,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2343 states, 1527 states have (on average 1.346430910281598) internal successors, (2056), 1583 states have internal predecessors, (2056), 663 states have call successors, (663), 152 states have call predecessors, (663), 152 states have return successors, (662), 637 states have call predecessors, (662), 662 states have call successors, (662) [2021-11-23 02:30:24,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2343 states to 2343 states and 3381 transitions. [2021-11-23 02:30:24,610 INFO L78 Accepts]: Start accepts. Automaton has 2343 states and 3381 transitions. Word has length 178 [2021-11-23 02:30:24,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:24,611 INFO L470 AbstractCegarLoop]: Abstraction has 2343 states and 3381 transitions. [2021-11-23 02:30:24,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-23 02:30:24,611 INFO L276 IsEmpty]: Start isEmpty. Operand 2343 states and 3381 transitions. [2021-11-23 02:30:24,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-11-23 02:30:24,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:24,616 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:24,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-23 02:30:24,616 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:24,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:24,617 INFO L85 PathProgramCache]: Analyzing trace with hash -39585001, now seen corresponding path program 1 times [2021-11-23 02:30:24,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:24,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62666059] [2021-11-23 02:30:24,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:24,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:24,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:25,211 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-23 02:30:25,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:25,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62666059] [2021-11-23 02:30:25,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62666059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:25,212 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:30:25,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:30:25,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039316122] [2021-11-23 02:30:25,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:25,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:25,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:25,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:25,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:30:25,214 INFO L87 Difference]: Start difference. First operand 2343 states and 3381 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:28,236 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:36,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:36,538 INFO L93 Difference]: Finished difference Result 4683 states and 6766 transitions. [2021-11-23 02:30:36,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:30:36,542 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 179 [2021-11-23 02:30:36,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:36,553 INFO L225 Difference]: With dead ends: 4683 [2021-11-23 02:30:36,553 INFO L226 Difference]: Without dead ends: 2342 [2021-11-23 02:30:36,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:30:36,559 INFO L933 BasicCegarLoop]: 1278 mSDtfsCounter, 1684 mSDsluCounter, 2114 mSDsCounter, 0 mSdLazyCounter, 633 mSolverCounterSat, 457 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1685 SdHoareTripleChecker+Valid, 3273 SdHoareTripleChecker+Invalid, 1091 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 457 IncrementalHoareTripleChecker+Valid, 633 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:36,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1685 Valid, 3273 Invalid, 1091 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [457 Valid, 633 Invalid, 1 Unknown, 0 Unchecked, 11.1s Time] [2021-11-23 02:30:36,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2342 states. [2021-11-23 02:30:36,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2342 to 2341. [2021-11-23 02:30:36,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 1526 states have (on average 1.3460026212319791) internal successors, (2054), 1582 states have internal predecessors, (2054), 662 states have call successors, (662), 152 states have call predecessors, (662), 152 states have return successors, (661), 636 states have call predecessors, (661), 661 states have call successors, (661) [2021-11-23 02:30:36,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 3377 transitions. [2021-11-23 02:30:36,691 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 3377 transitions. Word has length 179 [2021-11-23 02:30:36,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:36,692 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 3377 transitions. [2021-11-23 02:30:36,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:36,692 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 3377 transitions. [2021-11-23 02:30:36,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-23 02:30:36,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:36,698 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:36,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-23 02:30:36,698 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:36,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:36,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1312263583, now seen corresponding path program 1 times [2021-11-23 02:30:36,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:36,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008282702] [2021-11-23 02:30:36,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:36,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:36,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2021-11-23 02:30:37,270 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:37,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008282702] [2021-11-23 02:30:37,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008282702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:37,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:30:37,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:30:37,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502955094] [2021-11-23 02:30:37,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:37,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:37,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:37,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:37,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:30:37,273 INFO L87 Difference]: Start difference. First operand 2341 states and 3377 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:39,974 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:49,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:49,038 INFO L93 Difference]: Finished difference Result 4681 states and 6759 transitions. [2021-11-23 02:30:49,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:30:49,044 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 180 [2021-11-23 02:30:49,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:49,052 INFO L225 Difference]: With dead ends: 4681 [2021-11-23 02:30:49,053 INFO L226 Difference]: Without dead ends: 2342 [2021-11-23 02:30:49,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:30:49,058 INFO L933 BasicCegarLoop]: 1293 mSDtfsCounter, 1945 mSDsluCounter, 1884 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 524 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1946 SdHoareTripleChecker+Valid, 3061 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 524 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:49,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1946 Valid, 3061 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [524 Valid, 608 Invalid, 1 Unknown, 0 Unchecked, 11.5s Time] [2021-11-23 02:30:49,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2342 states. [2021-11-23 02:30:49,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2342 to 2339. [2021-11-23 02:30:49,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2339 states, 1525 states have (on average 1.3455737704918034) internal successors, (2052), 1581 states have internal predecessors, (2052), 661 states have call successors, (661), 152 states have call predecessors, (661), 152 states have return successors, (660), 635 states have call predecessors, (660), 660 states have call successors, (660) [2021-11-23 02:30:49,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2339 states to 2339 states and 3373 transitions. [2021-11-23 02:30:49,269 INFO L78 Accepts]: Start accepts. Automaton has 2339 states and 3373 transitions. Word has length 180 [2021-11-23 02:30:49,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:49,269 INFO L470 AbstractCegarLoop]: Abstraction has 2339 states and 3373 transitions. [2021-11-23 02:30:49,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:49,270 INFO L276 IsEmpty]: Start isEmpty. Operand 2339 states and 3373 transitions. [2021-11-23 02:30:49,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-23 02:30:49,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:49,273 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:49,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-23 02:30:49,273 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:49,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:49,274 INFO L85 PathProgramCache]: Analyzing trace with hash 919783491, now seen corresponding path program 1 times [2021-11-23 02:30:49,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:49,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40494479] [2021-11-23 02:30:49,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:49,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:49,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:49,798 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 02:30:49,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:49,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40494479] [2021-11-23 02:30:49,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40494479] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:49,798 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:30:49,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:30:49,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015590501] [2021-11-23 02:30:49,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:49,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:49,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:49,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:49,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:30:49,800 INFO L87 Difference]: Start difference. First operand 2339 states and 3373 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:53,257 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:30:58,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:58,503 INFO L93 Difference]: Finished difference Result 4675 states and 6748 transitions. [2021-11-23 02:30:58,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:30:58,508 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 181 [2021-11-23 02:30:58,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:58,518 INFO L225 Difference]: With dead ends: 4675 [2021-11-23 02:30:58,519 INFO L226 Difference]: Without dead ends: 2338 [2021-11-23 02:30:58,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:30:58,527 INFO L933 BasicCegarLoop]: 1608 mSDtfsCounter, 708 mSDsluCounter, 3875 mSDsCounter, 0 mSdLazyCounter, 901 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 708 SdHoareTripleChecker+Valid, 5246 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 901 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:58,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [708 Valid, 5246 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 901 Invalid, 1 Unknown, 0 Unchecked, 8.5s Time] [2021-11-23 02:30:58,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2338 states. [2021-11-23 02:30:58,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2338 to 2336. [2021-11-23 02:30:58,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 1523 states have (on average 1.3447143795141168) internal successors, (2048), 1579 states have internal predecessors, (2048), 660 states have call successors, (660), 152 states have call predecessors, (660), 152 states have return successors, (659), 634 states have call predecessors, (659), 659 states have call successors, (659) [2021-11-23 02:30:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 3367 transitions. [2021-11-23 02:30:58,697 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 3367 transitions. Word has length 181 [2021-11-23 02:30:58,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:58,698 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 3367 transitions. [2021-11-23 02:30:58,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:30:58,699 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 3367 transitions. [2021-11-23 02:30:58,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-23 02:30:58,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:58,703 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:58,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-23 02:30:58,704 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:58,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:58,705 INFO L85 PathProgramCache]: Analyzing trace with hash 2126964574, now seen corresponding path program 1 times [2021-11-23 02:30:58,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:58,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997228126] [2021-11-23 02:30:58,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:58,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:58,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:59,289 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 02:30:59,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:59,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997228126] [2021-11-23 02:30:59,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997228126] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:30:59,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:30:59,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:30:59,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892100207] [2021-11-23 02:30:59,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:59,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:30:59,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:59,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:30:59,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:30:59,292 INFO L87 Difference]: Start difference. First operand 2336 states and 3367 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:31:03,451 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:08,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:08,512 INFO L93 Difference]: Finished difference Result 4669 states and 6738 transitions. [2021-11-23 02:31:08,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:08,519 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 182 [2021-11-23 02:31:08,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:08,528 INFO L225 Difference]: With dead ends: 4669 [2021-11-23 02:31:08,528 INFO L226 Difference]: Without dead ends: 2335 [2021-11-23 02:31:08,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:31:08,534 INFO L933 BasicCegarLoop]: 1265 mSDtfsCounter, 1053 mSDsluCounter, 2862 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1054 SdHoareTripleChecker+Valid, 3965 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:08,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1054 Valid, 3965 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 802 Invalid, 1 Unknown, 0 Unchecked, 9.0s Time] [2021-11-23 02:31:08,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2335 states. [2021-11-23 02:31:08,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2335 to 2334. [2021-11-23 02:31:08,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2334 states, 1522 states have (on average 1.3442838370565047) internal successors, (2046), 1578 states have internal predecessors, (2046), 659 states have call successors, (659), 152 states have call predecessors, (659), 152 states have return successors, (658), 633 states have call predecessors, (658), 658 states have call successors, (658) [2021-11-23 02:31:08,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2334 states to 2334 states and 3363 transitions. [2021-11-23 02:31:08,650 INFO L78 Accepts]: Start accepts. Automaton has 2334 states and 3363 transitions. Word has length 182 [2021-11-23 02:31:08,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:08,650 INFO L470 AbstractCegarLoop]: Abstraction has 2334 states and 3363 transitions. [2021-11-23 02:31:08,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:31:08,650 INFO L276 IsEmpty]: Start isEmpty. Operand 2334 states and 3363 transitions. [2021-11-23 02:31:08,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-23 02:31:08,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:08,654 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:08,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-23 02:31:08,654 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:08,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:08,655 INFO L85 PathProgramCache]: Analyzing trace with hash -377632494, now seen corresponding path program 1 times [2021-11-23 02:31:08,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:08,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646274017] [2021-11-23 02:31:08,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:08,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:08,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:09,229 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-23 02:31:09,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:09,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646274017] [2021-11-23 02:31:09,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646274017] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:09,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:09,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:31:09,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079112657] [2021-11-23 02:31:09,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:09,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:09,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:09,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:09,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:31:09,232 INFO L87 Difference]: Start difference. First operand 2334 states and 3363 transitions. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:31:11,944 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:21,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:21,373 INFO L93 Difference]: Finished difference Result 4667 states and 6731 transitions. [2021-11-23 02:31:21,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:21,379 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 183 [2021-11-23 02:31:21,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:21,387 INFO L225 Difference]: With dead ends: 4667 [2021-11-23 02:31:21,387 INFO L226 Difference]: Without dead ends: 2335 [2021-11-23 02:31:21,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:31:21,393 INFO L933 BasicCegarLoop]: 1280 mSDtfsCounter, 1917 mSDsluCounter, 1870 mSDsCounter, 0 mSdLazyCounter, 606 mSolverCounterSat, 518 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1918 SdHoareTripleChecker+Valid, 3035 SdHoareTripleChecker+Invalid, 1125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 518 IncrementalHoareTripleChecker+Valid, 606 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:21,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1918 Valid, 3035 Invalid, 1125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [518 Valid, 606 Invalid, 1 Unknown, 0 Unchecked, 11.9s Time] [2021-11-23 02:31:21,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2335 states. [2021-11-23 02:31:21,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2335 to 2332. [2021-11-23 02:31:21,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2332 states, 1521 states have (on average 1.343852728468113) internal successors, (2044), 1577 states have internal predecessors, (2044), 658 states have call successors, (658), 152 states have call predecessors, (658), 152 states have return successors, (657), 632 states have call predecessors, (657), 657 states have call successors, (657) [2021-11-23 02:31:21,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2332 states to 2332 states and 3359 transitions. [2021-11-23 02:31:21,538 INFO L78 Accepts]: Start accepts. Automaton has 2332 states and 3359 transitions. Word has length 183 [2021-11-23 02:31:21,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:21,539 INFO L470 AbstractCegarLoop]: Abstraction has 2332 states and 3359 transitions. [2021-11-23 02:31:21,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-23 02:31:21,539 INFO L276 IsEmpty]: Start isEmpty. Operand 2332 states and 3359 transitions. [2021-11-23 02:31:21,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-23 02:31:21,542 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:21,542 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:21,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-23 02:31:21,543 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:21,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:21,543 INFO L85 PathProgramCache]: Analyzing trace with hash 914847346, now seen corresponding path program 1 times [2021-11-23 02:31:21,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:21,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481296115] [2021-11-23 02:31:21,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:21,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:21,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:21,986 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-23 02:31:21,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:21,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481296115] [2021-11-23 02:31:21,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481296115] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:21,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:21,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:31:21,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968487253] [2021-11-23 02:31:21,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:21,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:21,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:21,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:21,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:31:21,989 INFO L87 Difference]: Start difference. First operand 2332 states and 3359 transitions. Second operand has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) [2021-11-23 02:31:24,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:27,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:27,264 INFO L93 Difference]: Finished difference Result 3345 states and 4834 transitions. [2021-11-23 02:31:27,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:27,269 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) Word has length 184 [2021-11-23 02:31:27,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:27,280 INFO L225 Difference]: With dead ends: 3345 [2021-11-23 02:31:27,280 INFO L226 Difference]: Without dead ends: 3343 [2021-11-23 02:31:27,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:31:27,283 INFO L933 BasicCegarLoop]: 2199 mSDtfsCounter, 1370 mSDsluCounter, 5852 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1372 SdHoareTripleChecker+Valid, 7720 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:27,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1372 Valid, 7720 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 490 Invalid, 1 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 02:31:27,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3343 states. [2021-11-23 02:31:27,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3343 to 2332. [2021-11-23 02:31:27,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2332 states, 1521 states have (on average 1.3431952662721893) internal successors, (2043), 1577 states have internal predecessors, (2043), 658 states have call successors, (658), 152 states have call predecessors, (658), 152 states have return successors, (657), 632 states have call predecessors, (657), 657 states have call successors, (657) [2021-11-23 02:31:27,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2332 states to 2332 states and 3358 transitions. [2021-11-23 02:31:27,405 INFO L78 Accepts]: Start accepts. Automaton has 2332 states and 3358 transitions. Word has length 184 [2021-11-23 02:31:27,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:27,406 INFO L470 AbstractCegarLoop]: Abstraction has 2332 states and 3358 transitions. [2021-11-23 02:31:27,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) [2021-11-23 02:31:27,406 INFO L276 IsEmpty]: Start isEmpty. Operand 2332 states and 3358 transitions. [2021-11-23 02:31:27,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-23 02:31:27,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:27,413 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:27,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-23 02:31:27,414 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:27,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:27,414 INFO L85 PathProgramCache]: Analyzing trace with hash -237669722, now seen corresponding path program 1 times [2021-11-23 02:31:27,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:27,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690954649] [2021-11-23 02:31:27,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:27,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:27,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:28,065 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 02:31:28,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:28,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690954649] [2021-11-23 02:31:28,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690954649] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:28,066 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:28,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:31:28,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956089419] [2021-11-23 02:31:28,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:28,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:28,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:28,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:28,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:31:28,068 INFO L87 Difference]: Start difference. First operand 2332 states and 3358 transitions. Second operand has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:31:31,123 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:40,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:40,264 INFO L93 Difference]: Finished difference Result 4662 states and 6721 transitions. [2021-11-23 02:31:40,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:40,269 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 263 [2021-11-23 02:31:40,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:40,277 INFO L225 Difference]: With dead ends: 4662 [2021-11-23 02:31:40,277 INFO L226 Difference]: Without dead ends: 2332 [2021-11-23 02:31:40,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:31:40,283 INFO L933 BasicCegarLoop]: 1257 mSDtfsCounter, 1659 mSDsluCounter, 2090 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 448 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1660 SdHoareTripleChecker+Valid, 3229 SdHoareTripleChecker+Invalid, 1081 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 448 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:40,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1660 Valid, 3229 Invalid, 1081 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [448 Valid, 632 Invalid, 1 Unknown, 0 Unchecked, 11.9s Time] [2021-11-23 02:31:40,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2332 states. [2021-11-23 02:31:40,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2332 to 2330. [2021-11-23 02:31:40,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2330 states, 1520 states have (on average 1.3427631578947368) internal successors, (2041), 1576 states have internal predecessors, (2041), 657 states have call successors, (657), 152 states have call predecessors, (657), 152 states have return successors, (656), 631 states have call predecessors, (656), 656 states have call successors, (656) [2021-11-23 02:31:40,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2330 states to 2330 states and 3354 transitions. [2021-11-23 02:31:40,404 INFO L78 Accepts]: Start accepts. Automaton has 2330 states and 3354 transitions. Word has length 263 [2021-11-23 02:31:40,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:40,404 INFO L470 AbstractCegarLoop]: Abstraction has 2330 states and 3354 transitions. [2021-11-23 02:31:40,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.8) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:31:40,405 INFO L276 IsEmpty]: Start isEmpty. Operand 2330 states and 3354 transitions. [2021-11-23 02:31:40,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:31:40,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:40,409 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:40,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-23 02:31:40,410 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:40,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:40,410 INFO L85 PathProgramCache]: Analyzing trace with hash -546259673, now seen corresponding path program 1 times [2021-11-23 02:31:40,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:40,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909829307] [2021-11-23 02:31:40,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:40,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:40,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:41,085 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-23 02:31:41,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:41,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909829307] [2021-11-23 02:31:41,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909829307] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:41,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:41,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:31:41,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036367574] [2021-11-23 02:31:41,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:41,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:31:41,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:41,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:31:41,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:31:41,088 INFO L87 Difference]: Start difference. First operand 2330 states and 3354 transitions. Second operand has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:31:44,102 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:31:50,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:50,409 INFO L93 Difference]: Finished difference Result 4653 states and 6705 transitions. [2021-11-23 02:31:50,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:31:50,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 262 [2021-11-23 02:31:50,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:50,422 INFO L225 Difference]: With dead ends: 4653 [2021-11-23 02:31:50,422 INFO L226 Difference]: Without dead ends: 2325 [2021-11-23 02:31:50,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:31:50,428 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 909 mSDsluCounter, 2725 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 240 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 909 SdHoareTripleChecker+Valid, 4119 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:50,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [909 Valid, 4119 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 603 Invalid, 1 Unknown, 0 Unchecked, 9.1s Time] [2021-11-23 02:31:50,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2325 states. [2021-11-23 02:31:50,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2325 to 2324. [2021-11-23 02:31:50,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2324 states, 1516 states have (on average 1.341688654353562) internal successors, (2034), 1572 states have internal predecessors, (2034), 655 states have call successors, (655), 152 states have call predecessors, (655), 152 states have return successors, (654), 629 states have call predecessors, (654), 654 states have call successors, (654) [2021-11-23 02:31:50,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2324 states to 2324 states and 3343 transitions. [2021-11-23 02:31:50,671 INFO L78 Accepts]: Start accepts. Automaton has 2324 states and 3343 transitions. Word has length 262 [2021-11-23 02:31:50,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:50,672 INFO L470 AbstractCegarLoop]: Abstraction has 2324 states and 3343 transitions. [2021-11-23 02:31:50,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:31:50,672 INFO L276 IsEmpty]: Start isEmpty. Operand 2324 states and 3343 transitions. [2021-11-23 02:31:50,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 02:31:50,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:50,676 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:31:50,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-23 02:31:50,676 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:50,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:50,677 INFO L85 PathProgramCache]: Analyzing trace with hash -1152256589, now seen corresponding path program 1 times [2021-11-23 02:31:50,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:50,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432650998] [2021-11-23 02:31:50,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:50,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:50,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 02:31:51,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:51,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432650998] [2021-11-23 02:31:51,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432650998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:31:51,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:31:51,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:31:51,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951076037] [2021-11-23 02:31:51,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:31:51,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:31:51,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:51,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:31:51,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:31:51,510 INFO L87 Difference]: Start difference. First operand 2324 states and 3343 transitions. Second operand has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) [2021-11-23 02:31:54,441 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:13,566 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:13,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:13,955 INFO L93 Difference]: Finished difference Result 4646 states and 6692 transitions. [2021-11-23 02:32:13,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:32:13,960 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) Word has length 264 [2021-11-23 02:32:13,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:13,968 INFO L225 Difference]: With dead ends: 4646 [2021-11-23 02:32:13,968 INFO L226 Difference]: Without dead ends: 2324 [2021-11-23 02:32:13,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:32:13,974 INFO L933 BasicCegarLoop]: 1551 mSDtfsCounter, 1919 mSDsluCounter, 1747 mSDsCounter, 0 mSdLazyCounter, 2723 mSolverCounterSat, 18 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1919 SdHoareTripleChecker+Valid, 3086 SdHoareTripleChecker+Invalid, 2743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2723 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:13,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1919 Valid, 3086 Invalid, 2743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2723 Invalid, 2 Unknown, 0 Unchecked, 21.8s Time] [2021-11-23 02:32:13,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2324 states. [2021-11-23 02:32:14,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2324 to 2322. [2021-11-23 02:32:14,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2322 states, 1515 states have (on average 1.3412541254125412) internal successors, (2032), 1571 states have internal predecessors, (2032), 654 states have call successors, (654), 152 states have call predecessors, (654), 152 states have return successors, (653), 628 states have call predecessors, (653), 653 states have call successors, (653) [2021-11-23 02:32:14,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2322 states to 2322 states and 3339 transitions. [2021-11-23 02:32:14,074 INFO L78 Accepts]: Start accepts. Automaton has 2322 states and 3339 transitions. Word has length 264 [2021-11-23 02:32:14,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:14,075 INFO L470 AbstractCegarLoop]: Abstraction has 2322 states and 3339 transitions. [2021-11-23 02:32:14,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 6 states have internal predecessors, (130), 4 states have call successors, (40), 2 states have call predecessors, (40), 4 states have return successors, (38), 4 states have call predecessors, (38), 4 states have call successors, (38) [2021-11-23 02:32:14,075 INFO L276 IsEmpty]: Start isEmpty. Operand 2322 states and 3339 transitions. [2021-11-23 02:32:14,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-23 02:32:14,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:14,079 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:32:14,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-23 02:32:14,080 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:14,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:14,080 INFO L85 PathProgramCache]: Analyzing trace with hash 994827962, now seen corresponding path program 1 times [2021-11-23 02:32:14,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:14,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465351149] [2021-11-23 02:32:14,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:14,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:14,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:14,899 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2021-11-23 02:32:14,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:14,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465351149] [2021-11-23 02:32:14,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465351149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:32:14,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:32:14,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:32:14,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430948739] [2021-11-23 02:32:14,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:32:14,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:32:14,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:14,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:32:14,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:32:14,901 INFO L87 Difference]: Start difference. First operand 2322 states and 3339 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:32:17,533 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:36,108 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:36,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:36,503 INFO L93 Difference]: Finished difference Result 4637 states and 6676 transitions. [2021-11-23 02:32:36,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:32:36,508 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 263 [2021-11-23 02:32:36,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:36,515 INFO L225 Difference]: With dead ends: 4637 [2021-11-23 02:32:36,515 INFO L226 Difference]: Without dead ends: 2317 [2021-11-23 02:32:36,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:32:36,522 INFO L933 BasicCegarLoop]: 1934 mSDtfsCounter, 2804 mSDsluCounter, 1701 mSDsCounter, 0 mSdLazyCounter, 1705 mSolverCounterSat, 748 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2804 SdHoareTripleChecker+Valid, 3459 SdHoareTripleChecker+Invalid, 2455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 748 IncrementalHoareTripleChecker+Valid, 1705 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:36,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2804 Valid, 3459 Invalid, 2455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [748 Valid, 1705 Invalid, 2 Unknown, 0 Unchecked, 20.9s Time] [2021-11-23 02:32:36,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2317 states. [2021-11-23 02:32:36,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2317 to 2316. [2021-11-23 02:32:36,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2316 states, 1511 states have (on average 1.3401720714758438) internal successors, (2025), 1567 states have internal predecessors, (2025), 652 states have call successors, (652), 152 states have call predecessors, (652), 152 states have return successors, (651), 626 states have call predecessors, (651), 651 states have call successors, (651) [2021-11-23 02:32:36,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2316 states to 2316 states and 3328 transitions. [2021-11-23 02:32:36,619 INFO L78 Accepts]: Start accepts. Automaton has 2316 states and 3328 transitions. Word has length 263 [2021-11-23 02:32:36,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:36,623 INFO L470 AbstractCegarLoop]: Abstraction has 2316 states and 3328 transitions. [2021-11-23 02:32:36,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 6 states have internal predecessors, (131), 3 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:32:36,623 INFO L276 IsEmpty]: Start isEmpty. Operand 2316 states and 3328 transitions. [2021-11-23 02:32:36,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-23 02:32:36,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:36,627 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:32:36,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-23 02:32:36,627 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:36,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:36,627 INFO L85 PathProgramCache]: Analyzing trace with hash 531634730, now seen corresponding path program 1 times [2021-11-23 02:32:36,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:36,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141990248] [2021-11-23 02:32:36,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:36,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:36,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:37,314 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:32:37,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:37,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141990248] [2021-11-23 02:32:37,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141990248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:32:37,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:32:37,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:32:37,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880289575] [2021-11-23 02:32:37,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:32:37,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:32:37,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:37,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:32:37,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:32:37,316 INFO L87 Difference]: Start difference. First operand 2316 states and 3328 transitions. Second operand has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:32:40,396 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:45,366 INFO L93 Difference]: Finished difference Result 4629 states and 6659 transitions. [2021-11-23 02:32:45,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:32:45,372 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 265 [2021-11-23 02:32:45,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:45,382 INFO L225 Difference]: With dead ends: 4629 [2021-11-23 02:32:45,383 INFO L226 Difference]: Without dead ends: 2315 [2021-11-23 02:32:45,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:32:45,390 INFO L933 BasicCegarLoop]: 1243 mSDtfsCounter, 1015 mSDsluCounter, 2839 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1016 SdHoareTripleChecker+Valid, 3919 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:45,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1016 Valid, 3919 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 795 Invalid, 1 Unknown, 0 Unchecked, 7.8s Time] [2021-11-23 02:32:45,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2315 states. [2021-11-23 02:32:45,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2315 to 2312. [2021-11-23 02:32:45,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2312 states, 1509 states have (on average 1.3392975480450628) internal successors, (2021), 1565 states have internal predecessors, (2021), 650 states have call successors, (650), 152 states have call predecessors, (650), 152 states have return successors, (649), 624 states have call predecessors, (649), 649 states have call successors, (649) [2021-11-23 02:32:45,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 3320 transitions. [2021-11-23 02:32:45,555 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 3320 transitions. Word has length 265 [2021-11-23 02:32:45,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:45,558 INFO L470 AbstractCegarLoop]: Abstraction has 2312 states and 3320 transitions. [2021-11-23 02:32:45,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.2) internal successors, (131), 5 states have internal predecessors, (131), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:32:45,559 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 3320 transitions. [2021-11-23 02:32:45,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 02:32:45,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:45,565 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:32:45,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-23 02:32:45,565 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:45,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:45,566 INFO L85 PathProgramCache]: Analyzing trace with hash 369812471, now seen corresponding path program 1 times [2021-11-23 02:32:45,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:45,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134141124] [2021-11-23 02:32:45,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:45,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:45,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:46,203 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 02:32:46,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:46,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134141124] [2021-11-23 02:32:46,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134141124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:32:46,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:32:46,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:32:46,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635368395] [2021-11-23 02:32:46,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:32:46,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:32:46,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:46,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:32:46,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:32:46,205 INFO L87 Difference]: Start difference. First operand 2312 states and 3320 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:32:49,733 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:32:56,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:56,323 INFO L93 Difference]: Finished difference Result 4611 states and 6627 transitions. [2021-11-23 02:32:56,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:32:56,328 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 264 [2021-11-23 02:32:56,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:56,337 INFO L225 Difference]: With dead ends: 4611 [2021-11-23 02:32:56,337 INFO L226 Difference]: Without dead ends: 2301 [2021-11-23 02:32:56,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:32:56,342 INFO L933 BasicCegarLoop]: 1551 mSDtfsCounter, 848 mSDsluCounter, 2712 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 230 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 848 SdHoareTripleChecker+Valid, 4091 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:56,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [848 Valid, 4091 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 595 Invalid, 1 Unknown, 0 Unchecked, 9.9s Time] [2021-11-23 02:32:56,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2301 states. [2021-11-23 02:32:56,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2300. [2021-11-23 02:32:56,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2300 states, 1501 states have (on average 1.3371085942704863) internal successors, (2007), 1557 states have internal predecessors, (2007), 646 states have call successors, (646), 152 states have call predecessors, (646), 152 states have return successors, (645), 620 states have call predecessors, (645), 645 states have call successors, (645) [2021-11-23 02:32:56,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2300 states to 2300 states and 3298 transitions. [2021-11-23 02:32:56,438 INFO L78 Accepts]: Start accepts. Automaton has 2300 states and 3298 transitions. Word has length 264 [2021-11-23 02:32:56,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:56,439 INFO L470 AbstractCegarLoop]: Abstraction has 2300 states and 3298 transitions. [2021-11-23 02:32:56,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:32:56,439 INFO L276 IsEmpty]: Start isEmpty. Operand 2300 states and 3298 transitions. [2021-11-23 02:32:56,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-23 02:32:56,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:56,442 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:32:56,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-23 02:32:56,443 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:56,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:56,443 INFO L85 PathProgramCache]: Analyzing trace with hash 185887038, now seen corresponding path program 1 times [2021-11-23 02:32:56,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:56,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615675979] [2021-11-23 02:32:56,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:56,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:56,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:57,139 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2021-11-23 02:32:57,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:57,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615675979] [2021-11-23 02:32:57,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615675979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:32:57,140 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:32:57,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:32:57,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652294662] [2021-11-23 02:32:57,140 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:32:57,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:32:57,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:57,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:32:57,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:32:57,141 INFO L87 Difference]: Start difference. First operand 2300 states and 3298 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:33:00,315 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:33:05,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:05,724 INFO L93 Difference]: Finished difference Result 4597 states and 6599 transitions. [2021-11-23 02:33:05,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:33:05,730 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 266 [2021-11-23 02:33:05,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:05,738 INFO L225 Difference]: With dead ends: 4597 [2021-11-23 02:33:05,738 INFO L226 Difference]: Without dead ends: 2299 [2021-11-23 02:33:05,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:05,744 INFO L933 BasicCegarLoop]: 1230 mSDtfsCounter, 1000 mSDsluCounter, 2825 mSDsCounter, 0 mSdLazyCounter, 791 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1001 SdHoareTripleChecker+Valid, 3893 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 791 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:05,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1001 Valid, 3893 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 791 Invalid, 1 Unknown, 0 Unchecked, 8.3s Time] [2021-11-23 02:33:05,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2299 states. [2021-11-23 02:33:05,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2299 to 2296. [2021-11-23 02:33:05,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2296 states, 1499 states have (on average 1.3362241494329552) internal successors, (2003), 1555 states have internal predecessors, (2003), 644 states have call successors, (644), 152 states have call predecessors, (644), 152 states have return successors, (643), 618 states have call predecessors, (643), 643 states have call successors, (643) [2021-11-23 02:33:05,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2296 states to 2296 states and 3290 transitions. [2021-11-23 02:33:05,934 INFO L78 Accepts]: Start accepts. Automaton has 2296 states and 3290 transitions. Word has length 266 [2021-11-23 02:33:05,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:05,935 INFO L470 AbstractCegarLoop]: Abstraction has 2296 states and 3290 transitions. [2021-11-23 02:33:05,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:33:05,935 INFO L276 IsEmpty]: Start isEmpty. Operand 2296 states and 3290 transitions. [2021-11-23 02:33:05,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-23 02:33:05,938 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:05,939 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:05,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-23 02:33:05,939 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:05,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:05,939 INFO L85 PathProgramCache]: Analyzing trace with hash 650658557, now seen corresponding path program 1 times [2021-11-23 02:33:05,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:05,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190127857] [2021-11-23 02:33:05,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:05,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:06,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:06,524 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-23 02:33:06,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:06,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190127857] [2021-11-23 02:33:06,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190127857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:06,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:06,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:33:06,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735821186] [2021-11-23 02:33:06,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:06,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:33:06,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:06,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:33:06,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:33:06,527 INFO L87 Difference]: Start difference. First operand 2296 states and 3290 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:33:09,588 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:33:15,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:15,240 INFO L93 Difference]: Finished difference Result 4579 states and 6567 transitions. [2021-11-23 02:33:15,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:33:15,246 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) Word has length 265 [2021-11-23 02:33:15,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:15,256 INFO L225 Difference]: With dead ends: 4579 [2021-11-23 02:33:15,257 INFO L226 Difference]: Without dead ends: 2285 [2021-11-23 02:33:15,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:15,264 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 525 mSDsluCounter, 3757 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 5058 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:15,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [525 Valid, 5058 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 823 Invalid, 1 Unknown, 0 Unchecked, 8.5s Time] [2021-11-23 02:33:15,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2285 states. [2021-11-23 02:33:15,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2285 to 2284. [2021-11-23 02:33:15,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2284 states, 1491 states have (on average 1.3340040241448692) internal successors, (1989), 1547 states have internal predecessors, (1989), 640 states have call successors, (640), 152 states have call predecessors, (640), 152 states have return successors, (639), 614 states have call predecessors, (639), 639 states have call successors, (639) [2021-11-23 02:33:15,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2284 states to 2284 states and 3268 transitions. [2021-11-23 02:33:15,389 INFO L78 Accepts]: Start accepts. Automaton has 2284 states and 3268 transitions. Word has length 265 [2021-11-23 02:33:15,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:15,389 INFO L470 AbstractCegarLoop]: Abstraction has 2284 states and 3268 transitions. [2021-11-23 02:33:15,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 5 states have internal predecessors, (132), 3 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (37), 3 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-23 02:33:15,390 INFO L276 IsEmpty]: Start isEmpty. Operand 2284 states and 3268 transitions. [2021-11-23 02:33:15,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2021-11-23 02:33:15,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:15,393 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:15,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-11-23 02:33:15,394 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:15,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:15,394 INFO L85 PathProgramCache]: Analyzing trace with hash 682151732, now seen corresponding path program 1 times [2021-11-23 02:33:15,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:15,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388411121] [2021-11-23 02:33:15,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:15,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:15,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:15,816 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 02:33:15,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:15,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388411121] [2021-11-23 02:33:15,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388411121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:15,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:15,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:33:15,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242137579] [2021-11-23 02:33:15,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:15,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:33:15,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:15,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:33:15,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:15,819 INFO L87 Difference]: Start difference. First operand 2284 states and 3268 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:33:18,896 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:33:35,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:35,400 INFO L93 Difference]: Finished difference Result 3785 states and 5446 transitions. [2021-11-23 02:33:35,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:33:35,401 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 267 [2021-11-23 02:33:35,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:35,417 INFO L225 Difference]: With dead ends: 3785 [2021-11-23 02:33:35,418 INFO L226 Difference]: Without dead ends: 3783 [2021-11-23 02:33:35,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:33:35,421 INFO L933 BasicCegarLoop]: 1905 mSDtfsCounter, 1546 mSDsluCounter, 1402 mSDsCounter, 0 mSdLazyCounter, 5840 mSolverCounterSat, 1061 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1798 SdHoareTripleChecker+Valid, 3254 SdHoareTripleChecker+Invalid, 6902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1061 IncrementalHoareTripleChecker+Valid, 5840 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:35,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1798 Valid, 3254 Invalid, 6902 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1061 Valid, 5840 Invalid, 1 Unknown, 0 Unchecked, 19.1s Time] [2021-11-23 02:33:35,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3783 states. [2021-11-23 02:33:35,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3783 to 3763. [2021-11-23 02:33:35,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3763 states, 2457 states have (on average 1.3398453398453398) internal successors, (3292), 2547 states have internal predecessors, (3292), 1057 states have call successors, (1057), 247 states have call predecessors, (1057), 248 states have return successors, (1058), 1016 states have call predecessors, (1058), 1056 states have call successors, (1058) [2021-11-23 02:33:35,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3763 states to 3763 states and 5407 transitions. [2021-11-23 02:33:35,705 INFO L78 Accepts]: Start accepts. Automaton has 3763 states and 5407 transitions. Word has length 267 [2021-11-23 02:33:35,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:35,705 INFO L470 AbstractCegarLoop]: Abstraction has 3763 states and 5407 transitions. [2021-11-23 02:33:35,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-23 02:33:35,705 INFO L276 IsEmpty]: Start isEmpty. Operand 3763 states and 5407 transitions. [2021-11-23 02:33:35,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2021-11-23 02:33:35,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:35,711 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:35,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-11-23 02:33:35,712 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:35,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:35,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1269370111, now seen corresponding path program 1 times [2021-11-23 02:33:35,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:35,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657388101] [2021-11-23 02:33:35,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:35,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:35,932 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:33:35,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [149503706] [2021-11-23 02:33:35,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:35,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:35,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:35,957 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:35,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:33:36,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:36,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 2413 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:33:36,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:38,112 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-23 02:33:38,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:38,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:38,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657388101] [2021-11-23 02:33:38,113 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:33:38,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149503706] [2021-11-23 02:33:38,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149503706] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:38,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:38,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:33:38,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380175385] [2021-11-23 02:33:38,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:38,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:33:38,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:38,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:33:38,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:33:38,115 INFO L87 Difference]: Start difference. First operand 3763 states and 5407 transitions. Second operand has 5 states, 5 states have (on average 33.8) internal successors, (169), 5 states have internal predecessors, (169), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:33:41,415 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:33:48,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:48,843 INFO L93 Difference]: Finished difference Result 7522 states and 10821 transitions. [2021-11-23 02:33:48,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:33:48,844 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 33.8) internal successors, (169), 5 states have internal predecessors, (169), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) Word has length 307 [2021-11-23 02:33:48,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:48,863 INFO L225 Difference]: With dead ends: 7522 [2021-11-23 02:33:48,863 INFO L226 Difference]: Without dead ends: 3761 [2021-11-23 02:33:48,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:48,876 INFO L933 BasicCegarLoop]: 1220 mSDtfsCounter, 953 mSDsluCounter, 2451 mSDsCounter, 0 mSdLazyCounter, 1727 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 954 SdHoareTripleChecker+Valid, 3484 SdHoareTripleChecker+Invalid, 1735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1727 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:48,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [954 Valid, 3484 Invalid, 1735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1727 Invalid, 1 Unknown, 0 Unchecked, 10.4s Time] [2021-11-23 02:33:48,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3761 states. [2021-11-23 02:33:49,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3761 to 3757. [2021-11-23 02:33:49,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3757 states, 2454 states have (on average 1.339038304808476) internal successors, (3286), 2544 states have internal predecessors, (3286), 1054 states have call successors, (1054), 247 states have call predecessors, (1054), 248 states have return successors, (1055), 1013 states have call predecessors, (1055), 1053 states have call successors, (1055) [2021-11-23 02:33:49,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3757 states to 3757 states and 5395 transitions. [2021-11-23 02:33:49,083 INFO L78 Accepts]: Start accepts. Automaton has 3757 states and 5395 transitions. Word has length 307 [2021-11-23 02:33:49,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:49,084 INFO L470 AbstractCegarLoop]: Abstraction has 3757 states and 5395 transitions. [2021-11-23 02:33:49,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 33.8) internal successors, (169), 5 states have internal predecessors, (169), 3 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:33:49,084 INFO L276 IsEmpty]: Start isEmpty. Operand 3757 states and 5395 transitions. [2021-11-23 02:33:49,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-23 02:33:49,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:49,089 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:49,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:49,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:49,290 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:49,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:49,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1769388738, now seen corresponding path program 1 times [2021-11-23 02:33:49,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:49,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043100415] [2021-11-23 02:33:49,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:49,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:49,535 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:33:49,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1765365286] [2021-11-23 02:33:49,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:49,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:49,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:49,537 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:49,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:33:50,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:50,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 2407 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:33:50,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:51,875 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-23 02:33:51,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:51,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:51,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043100415] [2021-11-23 02:33:51,875 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:33:51,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765365286] [2021-11-23 02:33:51,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765365286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:51,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:51,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:33:51,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892978457] [2021-11-23 02:33:51,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:51,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:33:51,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:51,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:33:51,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:33:51,878 INFO L87 Difference]: Start difference. First operand 3757 states and 5395 transitions. Second operand has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:33:55,386 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:34:03,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:03,257 INFO L93 Difference]: Finished difference Result 7506 states and 10820 transitions. [2021-11-23 02:34:03,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:34:03,259 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) Word has length 306 [2021-11-23 02:34:03,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:03,278 INFO L225 Difference]: With dead ends: 7506 [2021-11-23 02:34:03,278 INFO L226 Difference]: Without dead ends: 3751 [2021-11-23 02:34:03,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:03,291 INFO L933 BasicCegarLoop]: 1219 mSDtfsCounter, 941 mSDsluCounter, 2453 mSDsCounter, 0 mSdLazyCounter, 1723 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 942 SdHoareTripleChecker+Valid, 3485 SdHoareTripleChecker+Invalid, 1731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1723 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:03,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [942 Valid, 3485 Invalid, 1731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1723 Invalid, 1 Unknown, 0 Unchecked, 11.0s Time] [2021-11-23 02:34:03,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3751 states. [2021-11-23 02:34:03,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3751 to 3743. [2021-11-23 02:34:03,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3743 states, 2447 states have (on average 1.3371475275847977) internal successors, (3272), 2537 states have internal predecessors, (3272), 1047 states have call successors, (1047), 247 states have call predecessors, (1047), 248 states have return successors, (1048), 1006 states have call predecessors, (1048), 1046 states have call successors, (1048) [2021-11-23 02:34:03,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3743 states to 3743 states and 5367 transitions. [2021-11-23 02:34:03,476 INFO L78 Accepts]: Start accepts. Automaton has 3743 states and 5367 transitions. Word has length 306 [2021-11-23 02:34:03,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:03,477 INFO L470 AbstractCegarLoop]: Abstraction has 3743 states and 5367 transitions. [2021-11-23 02:34:03,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:34:03,477 INFO L276 IsEmpty]: Start isEmpty. Operand 3743 states and 5367 transitions. [2021-11-23 02:34:03,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-23 02:34:03,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:03,482 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:03,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:03,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-23 02:34:03,683 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:03,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:03,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1137608695, now seen corresponding path program 1 times [2021-11-23 02:34:03,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:03,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181110334] [2021-11-23 02:34:03,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:03,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:03,863 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:34:03,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1577567869] [2021-11-23 02:34:03,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:03,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:03,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:03,864 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:03,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:34:04,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:04,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 2401 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:34:04,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:05,996 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 85 proven. 0 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-23 02:34:05,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:05,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:05,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181110334] [2021-11-23 02:34:05,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:34:05,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577567869] [2021-11-23 02:34:05,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577567869] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:05,997 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:05,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:34:05,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471099475] [2021-11-23 02:34:05,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:05,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:34:05,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:05,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:34:05,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:34:05,999 INFO L87 Difference]: Start difference. First operand 3743 states and 5367 transitions. Second operand has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) [2021-11-23 02:34:08,884 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:34:14,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:14,856 INFO L93 Difference]: Finished difference Result 7479 states and 10732 transitions. [2021-11-23 02:34:14,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:34:14,859 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) Word has length 305 [2021-11-23 02:34:14,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:14,874 INFO L225 Difference]: With dead ends: 7479 [2021-11-23 02:34:14,874 INFO L226 Difference]: Without dead ends: 3738 [2021-11-23 02:34:14,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:14,885 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 476 mSDsluCounter, 2558 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 3887 SdHoareTripleChecker+Invalid, 1269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:14,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [477 Valid, 3887 Invalid, 1269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1264 Invalid, 1 Unknown, 0 Unchecked, 8.5s Time] [2021-11-23 02:34:14,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3738 states. [2021-11-23 02:34:15,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3738 to 3737. [2021-11-23 02:34:15,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3737 states, 2443 states have (on average 1.3364715513712648) internal successors, (3265), 2533 states have internal predecessors, (3265), 1045 states have call successors, (1045), 247 states have call predecessors, (1045), 248 states have return successors, (1046), 1004 states have call predecessors, (1046), 1044 states have call successors, (1046) [2021-11-23 02:34:15,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3737 states to 3737 states and 5356 transitions. [2021-11-23 02:34:15,079 INFO L78 Accepts]: Start accepts. Automaton has 3737 states and 5356 transitions. Word has length 305 [2021-11-23 02:34:15,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:15,080 INFO L470 AbstractCegarLoop]: Abstraction has 3737 states and 5356 transitions. [2021-11-23 02:34:15,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.2) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (45), 3 states have call predecessors, (45), 3 states have return successors, (43), 3 states have call predecessors, (43), 3 states have call successors, (43) [2021-11-23 02:34:15,081 INFO L276 IsEmpty]: Start isEmpty. Operand 3737 states and 5356 transitions. [2021-11-23 02:34:15,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2021-11-23 02:34:15,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:15,087 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:15,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:15,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-23 02:34:15,288 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:15,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:15,288 INFO L85 PathProgramCache]: Analyzing trace with hash -567520269, now seen corresponding path program 1 times [2021-11-23 02:34:15,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:15,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673018105] [2021-11-23 02:34:15,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:15,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:15,443 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:34:15,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1711320430] [2021-11-23 02:34:15,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:15,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:15,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:15,444 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:15,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:34:16,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:16,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 2409 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:34:16,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:17,858 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-11-23 02:34:17,858 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:17,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:17,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673018105] [2021-11-23 02:34:17,859 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:34:17,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711320430] [2021-11-23 02:34:17,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711320430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:17,859 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:17,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:34:17,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790212990] [2021-11-23 02:34:17,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:17,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:34:17,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:17,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:34:17,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:34:17,861 INFO L87 Difference]: Start difference. First operand 3737 states and 5356 transitions. Second operand has 5 states, 5 states have (on average 34.0) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:34:20,905 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:34:27,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:27,768 INFO L93 Difference]: Finished difference Result 7461 states and 10705 transitions. [2021-11-23 02:34:27,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:34:27,771 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.0) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) Word has length 307 [2021-11-23 02:34:27,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:27,787 INFO L225 Difference]: With dead ends: 7461 [2021-11-23 02:34:27,787 INFO L226 Difference]: Without dead ends: 3726 [2021-11-23 02:34:27,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:27,796 INFO L933 BasicCegarLoop]: 1522 mSDtfsCounter, 456 mSDsluCounter, 2548 mSDsCounter, 0 mSdLazyCounter, 1250 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 3868 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1250 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:27,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 3868 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1250 Invalid, 1 Unknown, 0 Unchecked, 9.5s Time] [2021-11-23 02:34:27,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3726 states. [2021-11-23 02:34:27,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3726 to 3725. [2021-11-23 02:34:27,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3725 states, 2435 states have (on average 1.3351129363449692) internal successors, (3251), 2525 states have internal predecessors, (3251), 1041 states have call successors, (1041), 247 states have call predecessors, (1041), 248 states have return successors, (1042), 1000 states have call predecessors, (1042), 1040 states have call successors, (1042) [2021-11-23 02:34:27,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3725 states to 3725 states and 5334 transitions. [2021-11-23 02:34:27,995 INFO L78 Accepts]: Start accepts. Automaton has 3725 states and 5334 transitions. Word has length 307 [2021-11-23 02:34:27,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:27,995 INFO L470 AbstractCegarLoop]: Abstraction has 3725 states and 5334 transitions. [2021-11-23 02:34:27,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.0) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (46), 3 states have call predecessors, (46), 3 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:34:27,995 INFO L276 IsEmpty]: Start isEmpty. Operand 3725 states and 5334 transitions. [2021-11-23 02:34:27,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-23 02:34:27,999 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:27,999 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:28,028 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-23 02:34:28,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:28,200 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:28,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:28,200 INFO L85 PathProgramCache]: Analyzing trace with hash -1369898216, now seen corresponding path program 1 times [2021-11-23 02:34:28,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:28,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914316694] [2021-11-23 02:34:28,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:28,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:28,363 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:34:28,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [903470110] [2021-11-23 02:34:28,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:28,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:28,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:28,364 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:28,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:34:29,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:29,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 2417 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:34:29,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:29,851 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2021-11-23 02:34:29,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:29,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:29,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914316694] [2021-11-23 02:34:29,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:34:29,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903470110] [2021-11-23 02:34:29,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903470110] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:29,852 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:29,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 02:34:29,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629105867] [2021-11-23 02:34:29,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:29,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:34:29,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:29,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:34:29,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:34:29,853 INFO L87 Difference]: Start difference. First operand 3725 states and 5334 transitions. Second operand has 7 states, 6 states have (on average 27.333333333333332) internal successors, (164), 7 states have internal predecessors, (164), 3 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:34:33,636 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:34:35,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:35,870 INFO L93 Difference]: Finished difference Result 7519 states and 10786 transitions. [2021-11-23 02:34:35,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:34:35,877 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 27.333333333333332) internal successors, (164), 7 states have internal predecessors, (164), 3 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) Word has length 309 [2021-11-23 02:34:35,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:35,890 INFO L225 Difference]: With dead ends: 7519 [2021-11-23 02:34:35,890 INFO L226 Difference]: Without dead ends: 3727 [2021-11-23 02:34:35,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:34:35,899 INFO L933 BasicCegarLoop]: 1271 mSDtfsCounter, 272 mSDsluCounter, 5177 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 108 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 6145 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:35,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 6145 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 505 Invalid, 1 Unknown, 0 Unchecked, 5.7s Time] [2021-11-23 02:34:35,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3727 states. [2021-11-23 02:34:36,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3727 to 3725. [2021-11-23 02:34:36,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3725 states, 2435 states have (on average 1.3347022587268993) internal successors, (3250), 2524 states have internal predecessors, (3250), 1041 states have call successors, (1041), 247 states have call predecessors, (1041), 248 states have return successors, (1042), 1000 states have call predecessors, (1042), 1040 states have call successors, (1042) [2021-11-23 02:34:36,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3725 states to 3725 states and 5333 transitions. [2021-11-23 02:34:36,261 INFO L78 Accepts]: Start accepts. Automaton has 3725 states and 5333 transitions. Word has length 309 [2021-11-23 02:34:36,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:36,262 INFO L470 AbstractCegarLoop]: Abstraction has 3725 states and 5333 transitions. [2021-11-23 02:34:36,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 27.333333333333332) internal successors, (164), 7 states have internal predecessors, (164), 3 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (45), 3 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-23 02:34:36,262 INFO L276 IsEmpty]: Start isEmpty. Operand 3725 states and 5333 transitions. [2021-11-23 02:34:36,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-23 02:34:36,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:36,269 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:36,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:36,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:36,489 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:36,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:36,489 INFO L85 PathProgramCache]: Analyzing trace with hash -1936269176, now seen corresponding path program 1 times [2021-11-23 02:34:36,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:36,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426887471] [2021-11-23 02:34:36,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:36,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:36,646 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:34:36,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2050749895] [2021-11-23 02:34:36,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:36,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:36,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:36,648 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:36,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:34:37,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:37,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 2476 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:34:37,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:39,420 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-23 02:34:39,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:39,421 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:39,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426887471] [2021-11-23 02:34:39,421 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:34:39,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050749895] [2021-11-23 02:34:39,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050749895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:39,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:39,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:34:39,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380004903] [2021-11-23 02:34:39,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:39,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:34:39,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:39,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:34:39,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:34:39,423 INFO L87 Difference]: Start difference. First operand 3725 states and 5333 transitions. Second operand has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:34:42,325 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:34:52,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:52,120 INFO L93 Difference]: Finished difference Result 7443 states and 10697 transitions. [2021-11-23 02:34:52,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:34:52,123 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) Word has length 328 [2021-11-23 02:34:52,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:52,137 INFO L225 Difference]: With dead ends: 7443 [2021-11-23 02:34:52,137 INFO L226 Difference]: Without dead ends: 3720 [2021-11-23 02:34:52,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:52,146 INFO L933 BasicCegarLoop]: 1218 mSDtfsCounter, 917 mSDsluCounter, 2039 mSDsCounter, 0 mSdLazyCounter, 1673 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 918 SdHoareTripleChecker+Valid, 3080 SdHoareTripleChecker+Invalid, 1681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1673 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:52,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [918 Valid, 3080 Invalid, 1681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1673 Invalid, 1 Unknown, 0 Unchecked, 12.3s Time] [2021-11-23 02:34:52,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3720 states. [2021-11-23 02:34:52,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3720 to 3713. [2021-11-23 02:34:52,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3713 states, 2429 states have (on average 1.333058871963771) internal successors, (3238), 2518 states have internal predecessors, (3238), 1035 states have call successors, (1035), 247 states have call predecessors, (1035), 248 states have return successors, (1036), 994 states have call predecessors, (1036), 1034 states have call successors, (1036) [2021-11-23 02:34:52,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3713 states to 3713 states and 5309 transitions. [2021-11-23 02:34:52,389 INFO L78 Accepts]: Start accepts. Automaton has 3713 states and 5309 transitions. Word has length 328 [2021-11-23 02:34:52,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:52,389 INFO L470 AbstractCegarLoop]: Abstraction has 3713 states and 5309 transitions. [2021-11-23 02:34:52,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:34:52,390 INFO L276 IsEmpty]: Start isEmpty. Operand 3713 states and 5309 transitions. [2021-11-23 02:34:52,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2021-11-23 02:34:52,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:52,397 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:52,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:52,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-23 02:34:52,612 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:52,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:52,613 INFO L85 PathProgramCache]: Analyzing trace with hash -1449775463, now seen corresponding path program 1 times [2021-11-23 02:34:52,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:52,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697877985] [2021-11-23 02:34:52,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:52,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:52,799 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:34:52,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [508033978] [2021-11-23 02:34:52,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:52,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:52,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:52,800 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:52,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:34:53,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:53,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 2470 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:34:53,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:55,789 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-23 02:34:55,789 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:55,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:55,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697877985] [2021-11-23 02:34:55,790 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:34:55,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508033978] [2021-11-23 02:34:55,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508033978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:55,790 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:55,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:34:55,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240296853] [2021-11-23 02:34:55,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:55,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:34:55,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:55,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:34:55,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:34:55,791 INFO L87 Difference]: Start difference. First operand 3713 states and 5309 transitions. Second operand has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:34:59,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:35:07,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:07,643 INFO L93 Difference]: Finished difference Result 7419 states and 10620 transitions. [2021-11-23 02:35:07,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:35:07,646 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) Word has length 327 [2021-11-23 02:35:07,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:07,659 INFO L225 Difference]: With dead ends: 7419 [2021-11-23 02:35:07,659 INFO L226 Difference]: Without dead ends: 3708 [2021-11-23 02:35:07,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:07,672 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 417 mSDsluCounter, 3563 mSDsCounter, 0 mSdLazyCounter, 1456 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 4810 SdHoareTripleChecker+Invalid, 1461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1456 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:07,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [418 Valid, 4810 Invalid, 1461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1456 Invalid, 1 Unknown, 0 Unchecked, 11.5s Time] [2021-11-23 02:35:07,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3708 states. [2021-11-23 02:35:07,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3708 to 3707. [2021-11-23 02:35:07,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3707 states, 2425 states have (on average 1.3323711340206186) internal successors, (3231), 2514 states have internal predecessors, (3231), 1033 states have call successors, (1033), 247 states have call predecessors, (1033), 248 states have return successors, (1034), 992 states have call predecessors, (1034), 1032 states have call successors, (1034) [2021-11-23 02:35:07,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3707 states to 3707 states and 5298 transitions. [2021-11-23 02:35:07,898 INFO L78 Accepts]: Start accepts. Automaton has 3707 states and 5298 transitions. Word has length 327 [2021-11-23 02:35:07,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:07,899 INFO L470 AbstractCegarLoop]: Abstraction has 3707 states and 5298 transitions. [2021-11-23 02:35:07,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:35:07,899 INFO L276 IsEmpty]: Start isEmpty. Operand 3707 states and 5298 transitions. [2021-11-23 02:35:07,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-23 02:35:07,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:07,903 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:07,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:08,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-23 02:35:08,104 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:08,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:08,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1476090487, now seen corresponding path program 1 times [2021-11-23 02:35:08,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:08,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593396341] [2021-11-23 02:35:08,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:08,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:08,256 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:35:08,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [593024630] [2021-11-23 02:35:08,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:08,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:08,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:08,258 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:08,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:35:09,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:09,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 2476 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:35:09,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:11,038 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 02:35:11,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:11,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:11,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593396341] [2021-11-23 02:35:11,038 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:35:11,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593024630] [2021-11-23 02:35:11,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593024630] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:11,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:11,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:35:11,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112209964] [2021-11-23 02:35:11,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:11,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:35:11,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:11,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:35:11,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:35:11,040 INFO L87 Difference]: Start difference. First operand 3707 states and 5298 transitions. Second operand has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) [2021-11-23 02:35:13,909 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:35:23,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:23,569 INFO L93 Difference]: Finished difference Result 7404 states and 10625 transitions. [2021-11-23 02:35:23,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:35:23,572 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) Word has length 328 [2021-11-23 02:35:23,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:23,585 INFO L225 Difference]: With dead ends: 7404 [2021-11-23 02:35:23,585 INFO L226 Difference]: Without dead ends: 3699 [2021-11-23 02:35:23,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:23,593 INFO L933 BasicCegarLoop]: 1217 mSDtfsCounter, 915 mSDsluCounter, 2038 mSDsCounter, 0 mSdLazyCounter, 1669 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 916 SdHoareTripleChecker+Valid, 3078 SdHoareTripleChecker+Invalid, 1677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1669 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:23,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [916 Valid, 3078 Invalid, 1677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1669 Invalid, 1 Unknown, 0 Unchecked, 12.1s Time] [2021-11-23 02:35:23,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3699 states. [2021-11-23 02:35:23,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3699 to 3691. [2021-11-23 02:35:23,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3691 states, 2417 states have (on average 1.3305750930906082) internal successors, (3216), 2506 states have internal predecessors, (3216), 1026 states have call successors, (1026), 246 states have call predecessors, (1026), 247 states have return successors, (1027), 985 states have call predecessors, (1027), 1025 states have call successors, (1027) [2021-11-23 02:35:23,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3691 states to 3691 states and 5269 transitions. [2021-11-23 02:35:23,848 INFO L78 Accepts]: Start accepts. Automaton has 3691 states and 5269 transitions. Word has length 328 [2021-11-23 02:35:23,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:23,849 INFO L470 AbstractCegarLoop]: Abstraction has 3691 states and 5269 transitions. [2021-11-23 02:35:23,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) [2021-11-23 02:35:23,849 INFO L276 IsEmpty]: Start isEmpty. Operand 3691 states and 5269 transitions. [2021-11-23 02:35:23,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2021-11-23 02:35:23,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:23,856 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:23,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:24,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:24,084 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:24,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:24,084 INFO L85 PathProgramCache]: Analyzing trace with hash -36977638, now seen corresponding path program 1 times [2021-11-23 02:35:24,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:24,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232878063] [2021-11-23 02:35:24,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:24,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:24,340 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:35:24,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [869286947] [2021-11-23 02:35:24,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:24,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:24,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:24,342 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:24,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:35:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:25,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 2470 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:35:25,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:27,512 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2021-11-23 02:35:27,512 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:27,513 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:27,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232878063] [2021-11-23 02:35:27,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:35:27,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869286947] [2021-11-23 02:35:27,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869286947] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:27,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:27,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:35:27,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524486782] [2021-11-23 02:35:27,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:27,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:35:27,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:27,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:35:27,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:35:27,516 INFO L87 Difference]: Start difference. First operand 3691 states and 5269 transitions. Second operand has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:35:30,462 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:35:40,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:40,970 INFO L93 Difference]: Finished difference Result 7375 states and 10569 transitions. [2021-11-23 02:35:40,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:35:40,973 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) Word has length 327 [2021-11-23 02:35:40,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:40,985 INFO L225 Difference]: With dead ends: 7375 [2021-11-23 02:35:40,985 INFO L226 Difference]: Without dead ends: 3686 [2021-11-23 02:35:40,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:40,994 INFO L933 BasicCegarLoop]: 1216 mSDtfsCounter, 902 mSDsluCounter, 2037 mSDsCounter, 0 mSdLazyCounter, 1665 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 903 SdHoareTripleChecker+Valid, 3076 SdHoareTripleChecker+Invalid, 1673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1665 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:40,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [903 Valid, 3076 Invalid, 1673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1665 Invalid, 1 Unknown, 0 Unchecked, 13.1s Time] [2021-11-23 02:35:40,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3686 states. [2021-11-23 02:35:41,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3686 to 3679. [2021-11-23 02:35:41,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3679 states, 2411 states have (on average 1.3289091663210286) internal successors, (3204), 2500 states have internal predecessors, (3204), 1020 states have call successors, (1020), 246 states have call predecessors, (1020), 247 states have return successors, (1021), 979 states have call predecessors, (1021), 1019 states have call successors, (1021) [2021-11-23 02:35:41,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3679 states to 3679 states and 5245 transitions. [2021-11-23 02:35:41,170 INFO L78 Accepts]: Start accepts. Automaton has 3679 states and 5245 transitions. Word has length 327 [2021-11-23 02:35:41,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:41,171 INFO L470 AbstractCegarLoop]: Abstraction has 3679 states and 5245 transitions. [2021-11-23 02:35:41,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (50), 3 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:35:41,171 INFO L276 IsEmpty]: Start isEmpty. Operand 3679 states and 5245 transitions. [2021-11-23 02:35:41,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-23 02:35:41,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:41,175 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:41,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:41,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:41,376 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:41,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:41,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1023230341, now seen corresponding path program 1 times [2021-11-23 02:35:41,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:41,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100214948] [2021-11-23 02:35:41,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:41,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:41,528 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:35:41,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [509024511] [2021-11-23 02:35:41,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:41,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:41,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:41,530 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:41,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:35:42,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:42,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 2464 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:35:42,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:44,379 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-23 02:35:44,379 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:44,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:44,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100214948] [2021-11-23 02:35:44,379 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:35:44,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509024511] [2021-11-23 02:35:44,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509024511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:44,380 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:44,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:35:44,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479808714] [2021-11-23 02:35:44,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:44,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:35:44,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:44,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:35:44,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:35:44,381 INFO L87 Difference]: Start difference. First operand 3679 states and 5245 transitions. Second operand has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:35:47,306 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:35:55,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:55,189 INFO L93 Difference]: Finished difference Result 7341 states and 10481 transitions. [2021-11-23 02:35:55,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:35:55,192 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) Word has length 326 [2021-11-23 02:35:55,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:55,322 INFO L225 Difference]: With dead ends: 7341 [2021-11-23 02:35:55,322 INFO L226 Difference]: Without dead ends: 3664 [2021-11-23 02:35:55,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:55,327 INFO L933 BasicCegarLoop]: 1492 mSDtfsCounter, 403 mSDsluCounter, 2514 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 3806 SdHoareTripleChecker+Invalid, 1212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:55,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [404 Valid, 3806 Invalid, 1212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1207 Invalid, 1 Unknown, 0 Unchecked, 10.4s Time] [2021-11-23 02:35:55,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3664 states. [2021-11-23 02:35:55,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3664 to 3663. [2021-11-23 02:35:55,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3663 states, 2401 states have (on average 1.327780091628488) internal successors, (3188), 2490 states have internal predecessors, (3188), 1016 states have call successors, (1016), 244 states have call predecessors, (1016), 245 states have return successors, (1017), 975 states have call predecessors, (1017), 1015 states have call successors, (1017) [2021-11-23 02:35:55,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3663 states to 3663 states and 5221 transitions. [2021-11-23 02:35:55,516 INFO L78 Accepts]: Start accepts. Automaton has 3663 states and 5221 transitions. Word has length 326 [2021-11-23 02:35:55,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:55,516 INFO L470 AbstractCegarLoop]: Abstraction has 3663 states and 5221 transitions. [2021-11-23 02:35:55,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.4) internal successors, (182), 5 states have internal predecessors, (182), 3 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (47), 3 states have call predecessors, (47), 3 states have call successors, (47) [2021-11-23 02:35:55,516 INFO L276 IsEmpty]: Start isEmpty. Operand 3663 states and 5221 transitions. [2021-11-23 02:35:55,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2021-11-23 02:35:55,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:55,520 INFO L514 BasicCegarLoop]: trace histogram [11, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:55,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:55,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-23 02:35:55,721 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:55,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:55,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1504248501, now seen corresponding path program 1 times [2021-11-23 02:35:55,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:55,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373809010] [2021-11-23 02:35:55,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:55,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:55,874 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:35:55,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1511780594] [2021-11-23 02:35:55,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:55,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:55,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:55,875 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:55,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:35:56,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:56,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 2478 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:35:56,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:57,333 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2021-11-23 02:35:57,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:57,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:57,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373809010] [2021-11-23 02:35:57,333 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:35:57,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511780594] [2021-11-23 02:35:57,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511780594] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:57,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:57,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:35:57,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001485280] [2021-11-23 02:35:57,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:57,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:57,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:57,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:57,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:57,335 INFO L87 Difference]: Start difference. First operand 3663 states and 5221 transitions. Second operand has 6 states, 6 states have (on average 28.166666666666668) internal successors, (169), 6 states have internal predecessors, (169), 3 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:36:01,185 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:03,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:03,425 INFO L93 Difference]: Finished difference Result 7326 states and 10450 transitions. [2021-11-23 02:36:03,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:36:03,432 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 28.166666666666668) internal successors, (169), 6 states have internal predecessors, (169), 3 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) Word has length 329 [2021-11-23 02:36:03,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:03,443 INFO L225 Difference]: With dead ends: 7326 [2021-11-23 02:36:03,443 INFO L226 Difference]: Without dead ends: 3663 [2021-11-23 02:36:03,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:36:03,451 INFO L933 BasicCegarLoop]: 1271 mSDtfsCounter, 421 mSDsluCounter, 3786 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 160 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 421 SdHoareTripleChecker+Valid, 4837 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:03,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [421 Valid, 4837 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 358 Invalid, 1 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 02:36:03,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3663 states. [2021-11-23 02:36:03,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3663 to 3663. [2021-11-23 02:36:03,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3663 states, 2401 states have (on average 1.3273635985006247) internal successors, (3187), 2490 states have internal predecessors, (3187), 1016 states have call successors, (1016), 244 states have call predecessors, (1016), 245 states have return successors, (1017), 975 states have call predecessors, (1017), 1015 states have call successors, (1017) [2021-11-23 02:36:03,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3663 states to 3663 states and 5220 transitions. [2021-11-23 02:36:03,621 INFO L78 Accepts]: Start accepts. Automaton has 3663 states and 5220 transitions. Word has length 329 [2021-11-23 02:36:03,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:03,621 INFO L470 AbstractCegarLoop]: Abstraction has 3663 states and 5220 transitions. [2021-11-23 02:36:03,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 28.166666666666668) internal successors, (169), 6 states have internal predecessors, (169), 3 states have call successors, (50), 2 states have call predecessors, (50), 3 states have return successors, (48), 3 states have call predecessors, (48), 3 states have call successors, (48) [2021-11-23 02:36:03,621 INFO L276 IsEmpty]: Start isEmpty. Operand 3663 states and 5220 transitions. [2021-11-23 02:36:03,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2021-11-23 02:36:03,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:03,626 INFO L514 BasicCegarLoop]: trace histogram [12, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:03,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:03,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:03,827 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:03,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:03,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1604426741, now seen corresponding path program 1 times [2021-11-23 02:36:03,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:03,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304964023] [2021-11-23 02:36:03,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:03,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:03,979 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:36:03,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [475519383] [2021-11-23 02:36:03,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:03,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:03,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:03,980 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:03,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:36:04,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:04,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 2520 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:36:04,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:07,953 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 115 proven. 0 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-23 02:36:07,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:07,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:07,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304964023] [2021-11-23 02:36:07,954 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:36:07,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475519383] [2021-11-23 02:36:07,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475519383] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:07,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:07,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:36:07,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955306272] [2021-11-23 02:36:07,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:07,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:36:07,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:07,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:36:07,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:36:07,955 INFO L87 Difference]: Start difference. First operand 3663 states and 5220 transitions. Second operand has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) [2021-11-23 02:36:11,194 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:21,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:21,230 INFO L93 Difference]: Finished difference Result 7319 states and 10438 transitions. [2021-11-23 02:36:21,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:36:21,234 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) Word has length 345 [2021-11-23 02:36:21,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:21,246 INFO L225 Difference]: With dead ends: 7319 [2021-11-23 02:36:21,246 INFO L226 Difference]: Without dead ends: 3658 [2021-11-23 02:36:21,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:36:21,254 INFO L933 BasicCegarLoop]: 1482 mSDtfsCounter, 365 mSDsluCounter, 3531 mSDsCounter, 0 mSdLazyCounter, 1417 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 4753 SdHoareTripleChecker+Invalid, 1424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1417 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:21,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [367 Valid, 4753 Invalid, 1424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1417 Invalid, 1 Unknown, 0 Unchecked, 12.8s Time] [2021-11-23 02:36:21,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3658 states. [2021-11-23 02:36:21,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3658 to 3657. [2021-11-23 02:36:21,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3657 states, 2397 states have (on average 1.3266583229036295) internal successors, (3180), 2486 states have internal predecessors, (3180), 1014 states have call successors, (1014), 244 states have call predecessors, (1014), 245 states have return successors, (1015), 973 states have call predecessors, (1015), 1013 states have call successors, (1015) [2021-11-23 02:36:21,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3657 states to 3657 states and 5209 transitions. [2021-11-23 02:36:21,433 INFO L78 Accepts]: Start accepts. Automaton has 3657 states and 5209 transitions. Word has length 345 [2021-11-23 02:36:21,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:21,434 INFO L470 AbstractCegarLoop]: Abstraction has 3657 states and 5209 transitions. [2021-11-23 02:36:21,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (49), 3 states have call predecessors, (49), 3 states have call successors, (49) [2021-11-23 02:36:21,434 INFO L276 IsEmpty]: Start isEmpty. Operand 3657 states and 5209 transitions. [2021-11-23 02:36:21,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2021-11-23 02:36:21,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:21,439 INFO L514 BasicCegarLoop]: trace histogram [12, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:21,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:21,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-23 02:36:21,648 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:21,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:21,648 INFO L85 PathProgramCache]: Analyzing trace with hash -762545770, now seen corresponding path program 1 times [2021-11-23 02:36:21,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:21,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953619400] [2021-11-23 02:36:21,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:21,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:21,800 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:36:21,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1927459483] [2021-11-23 02:36:21,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:21,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:21,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:21,801 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:21,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:36:22,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:22,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 2526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:36:22,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:25,822 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-23 02:36:25,822 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:25,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:25,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953619400] [2021-11-23 02:36:25,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:36:25,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927459483] [2021-11-23 02:36:25,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927459483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:25,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:25,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:36:25,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56937132] [2021-11-23 02:36:25,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:25,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:36:25,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:25,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:36:25,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:36:25,825 INFO L87 Difference]: Start difference. First operand 3657 states and 5209 transitions. Second operand has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (52), 3 states have call predecessors, (52), 3 states have return successors, (50), 3 states have call predecessors, (50), 3 states have call successors, (50) [2021-11-23 02:36:29,227 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:36:42,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:42,141 INFO L93 Difference]: Finished difference Result 7306 states and 10426 transitions. [2021-11-23 02:36:42,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:36:42,145 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (52), 3 states have call predecessors, (52), 3 states have return successors, (50), 3 states have call predecessors, (50), 3 states have call successors, (50) Word has length 346 [2021-11-23 02:36:42,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:42,158 INFO L225 Difference]: With dead ends: 7306 [2021-11-23 02:36:42,158 INFO L226 Difference]: Without dead ends: 3651 [2021-11-23 02:36:42,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:36:42,167 INFO L933 BasicCegarLoop]: 1212 mSDtfsCounter, 886 mSDsluCounter, 2456 mSDsCounter, 0 mSdLazyCounter, 1704 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 887 SdHoareTripleChecker+Valid, 3481 SdHoareTripleChecker+Invalid, 1712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1704 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:42,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [887 Valid, 3481 Invalid, 1712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1704 Invalid, 1 Unknown, 0 Unchecked, 15.8s Time] [2021-11-23 02:36:42,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3651 states. [2021-11-23 02:36:42,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3651 to 3645. [2021-11-23 02:36:42,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3645 states, 2391 states have (on average 1.3249686323713927) internal successors, (3168), 2480 states have internal predecessors, (3168), 1008 states have call successors, (1008), 244 states have call predecessors, (1008), 245 states have return successors, (1009), 967 states have call predecessors, (1009), 1007 states have call successors, (1009) [2021-11-23 02:36:42,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3645 states to 3645 states and 5185 transitions. [2021-11-23 02:36:42,339 INFO L78 Accepts]: Start accepts. Automaton has 3645 states and 5185 transitions. Word has length 346 [2021-11-23 02:36:42,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:42,340 INFO L470 AbstractCegarLoop]: Abstraction has 3645 states and 5185 transitions. [2021-11-23 02:36:42,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 36.0) internal successors, (180), 5 states have internal predecessors, (180), 3 states have call successors, (52), 3 states have call predecessors, (52), 3 states have return successors, (50), 3 states have call predecessors, (50), 3 states have call successors, (50) [2021-11-23 02:36:42,340 INFO L276 IsEmpty]: Start isEmpty. Operand 3645 states and 5185 transitions. [2021-11-23 02:36:42,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2021-11-23 02:36:42,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:42,344 INFO L514 BasicCegarLoop]: trace histogram [13, 7, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:42,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-23 02:36:42,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:42,545 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:42,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:42,545 INFO L85 PathProgramCache]: Analyzing trace with hash 595440596, now seen corresponding path program 1 times [2021-11-23 02:36:42,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:42,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774295885] [2021-11-23 02:36:42,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:42,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:42,798 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:36:42,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1304781662] [2021-11-23 02:36:42,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:42,798 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:42,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:42,799 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:42,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b5a1a56f-430c-4f50-b9a9-9e7f03101082/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:36:43,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:43,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 2528 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:36:43,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:44,423 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-23 02:36:44,423 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:44,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:44,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774295885] [2021-11-23 02:36:44,424 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:36:44,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304781662] [2021-11-23 02:36:44,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304781662] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:44,424 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:36:44,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:36:44,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219988681] [2021-11-23 02:36:44,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:44,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:36:44,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:44,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:36:44,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:36:44,426 INFO L87 Difference]: Start difference. First operand 3645 states and 5185 transitions. Second operand has 6 states, 5 states have (on average 34.8) internal successors, (174), 6 states have internal predecessors, (174), 5 states have call successors, (52), 2 states have call predecessors, (52), 4 states have return successors, (50), 4 states have call predecessors, (50), 5 states have call successors, (50)