./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 91dfff3356c8586e4ab54260d22ce3d78ead2ec4d531619c6564036666f10187 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:32:20,270 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:32:20,272 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:32:20,305 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:32:20,305 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:32:20,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:32:20,309 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:32:20,311 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:32:20,314 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:32:20,315 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:32:20,317 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:32:20,318 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:32:20,319 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:32:20,321 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:32:20,322 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:32:20,324 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:32:20,326 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:32:20,327 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:32:20,329 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:32:20,332 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:32:20,334 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:32:20,337 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:32:20,339 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:32:20,340 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:32:20,344 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:32:20,345 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:32:20,345 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:32:20,347 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:32:20,347 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:32:20,349 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:32:20,349 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:32:20,350 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:32:20,352 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:32:20,353 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:32:20,354 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:32:20,355 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:32:20,356 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:32:20,356 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:32:20,357 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:32:20,358 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:32:20,359 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:32:20,360 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:32:20,388 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:32:20,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:32:20,393 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:32:20,393 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:32:20,394 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:32:20,394 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:32:20,394 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:32:20,395 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:32:20,396 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:32:20,396 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:32:20,397 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:32:20,397 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:32:20,397 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:32:20,398 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:32:20,398 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:32:20,398 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:32:20,398 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:32:20,399 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:32:20,400 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:32:20,401 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:32:20,401 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:32:20,401 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:32:20,401 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:32:20,402 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:32:20,402 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:32:20,402 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:32:20,404 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:32:20,404 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:32:20,404 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:32:20,404 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:32:20,405 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:32:20,405 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:32:20,405 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:32:20,406 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:32:20,406 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:32:20,406 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:32:20,406 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:32:20,407 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:32:20,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:32:20,407 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:32:20,407 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:32:20,408 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_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 91dfff3356c8586e4ab54260d22ce3d78ead2ec4d531619c6564036666f10187 [2021-11-21 01:32:20,685 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:32:20,712 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:32:20,715 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:32:20,717 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:32:20,717 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:32:20,719 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c [2021-11-21 01:32:20,792 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/data/eb65cd284/ec61bda0f4ed429d91f4ff032e2d73eb/FLAGbef3cb7ea [2021-11-21 01:32:21,300 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:32:21,301 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c [2021-11-21 01:32:21,308 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/data/eb65cd284/ec61bda0f4ed429d91f4ff032e2d73eb/FLAGbef3cb7ea [2021-11-21 01:32:21,690 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/data/eb65cd284/ec61bda0f4ed429d91f4ff032e2d73eb [2021-11-21 01:32:21,694 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:32:21,697 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:32:21,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:32:21,705 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:32:21,709 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:32:21,710 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:32:21" (1/1) ... [2021-11-21 01:32:21,715 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d5315e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:21, skipping insertion in model container [2021-11-21 01:32:21,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:32:21" (1/1) ... [2021-11-21 01:32:21,725 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:32:21,751 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:32:21,952 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_b8222acd-0d41-4fb5-a69d-a7266783d1a2/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c[537,550] [2021-11-21 01:32:21,982 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:32:21,998 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:32:22,019 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_b8222acd-0d41-4fb5-a69d-a7266783d1a2/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound10.c[537,550] [2021-11-21 01:32:22,047 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:32:22,067 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:32:22,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22 WrapperNode [2021-11-21 01:32:22,068 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:32:22,070 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:32:22,070 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:32:22,071 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:32:22,080 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,099 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,132 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-21 01:32:22,133 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:32:22,134 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:32:22,134 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:32:22,135 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:32:22,145 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,167 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,172 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,180 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,186 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:32:22,189 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:32:22,189 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:32:22,189 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:32:22,191 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (1/1) ... [2021-11-21 01:32:22,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:32:22,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:22,233 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:32:22,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:32:22,293 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:32:22,294 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:32:22,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:32:22,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:32:22,294 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:32:22,295 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:32:22,381 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:32:22,383 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:32:22,541 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:32:22,584 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:32:22,597 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:32:22,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:32:22 BoogieIcfgContainer [2021-11-21 01:32:22,600 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:32:22,602 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:32:22,602 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:32:22,622 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:32:22,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:32:21" (1/3) ... [2021-11-21 01:32:22,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49845342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:32:22, skipping insertion in model container [2021-11-21 01:32:22,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:32:22" (2/3) ... [2021-11-21 01:32:22,624 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49845342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:32:22, skipping insertion in model container [2021-11-21 01:32:22,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:32:22" (3/3) ... [2021-11-21 01:32:22,626 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound10.c [2021-11-21 01:32:22,631 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:32:22,632 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:32:22,743 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:32:22,759 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 [2021-11-21 01:32:22,759 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:32:22,802 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 01:32:22,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:32:22,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:22,809 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:22,809 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:22,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:22,825 INFO L85 PathProgramCache]: Analyzing trace with hash 151460259, now seen corresponding path program 1 times [2021-11-21 01:32:22,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:22,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934533927] [2021-11-21 01:32:22,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:22,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:22,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:22,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:32:22,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:22,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934533927] [2021-11-21 01:32:22,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934533927] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:22,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:22,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:32:22,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672376498] [2021-11-21 01:32:22,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:22,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:32:22,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:23,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:32:23,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:32:23,031 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:23,070 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2021-11-21 01:32:23,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:32:23,073 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:32:23,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:23,082 INFO L225 Difference]: With dead ends: 43 [2021-11-21 01:32:23,083 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:32:23,087 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 [2021-11-21 01:32:23,092 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:23,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:32:23,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:32:23,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 01:32:23,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:32:23,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2021-11-21 01:32:23,137 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2021-11-21 01:32:23,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:23,138 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2021-11-21 01:32:23,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,139 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2021-11-21 01:32:23,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:32:23,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:23,140 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:23,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:32:23,141 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:23,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:23,142 INFO L85 PathProgramCache]: Analyzing trace with hash -310598151, now seen corresponding path program 1 times [2021-11-21 01:32:23,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:23,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654051431] [2021-11-21 01:32:23,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:23,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:23,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:23,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:32:23,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:23,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654051431] [2021-11-21 01:32:23,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654051431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:23,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:23,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:32:23,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621913450] [2021-11-21 01:32:23,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:23,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:32:23,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:23,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:32:23,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:32:23,287 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:23,365 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2021-11-21 01:32:23,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:32:23,369 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:32:23,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:23,371 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:32:23,371 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:32:23,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:32:23,375 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:23,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:32:23,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:32:23,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-11-21 01:32:23,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:32:23,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-21 01:32:23,390 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2021-11-21 01:32:23,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:23,390 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-21 01:32:23,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,394 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-21 01:32:23,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:32:23,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:23,395 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:23,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:32:23,409 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:23,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:23,410 INFO L85 PathProgramCache]: Analyzing trace with hash -751211152, now seen corresponding path program 1 times [2021-11-21 01:32:23,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:23,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241168875] [2021-11-21 01:32:23,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:23,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:23,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:23,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:32:23,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:23,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241168875] [2021-11-21 01:32:23,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241168875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:23,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:23,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:32:23,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968800757] [2021-11-21 01:32:23,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:23,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:32:23,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:23,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:32:23,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:32:23,494 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:23,532 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-21 01:32:23,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:32:23,533 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 01:32:23,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:23,534 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:32:23,536 INFO L226 Difference]: Without dead ends: 26 [2021-11-21 01:32:23,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:32:23,539 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:23,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:32:23,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-21 01:32:23,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-21 01:32:23,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:32:23,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-21 01:32:23,559 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2021-11-21 01:32:23,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:23,559 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-21 01:32:23,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:32:23,561 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-21 01:32:23,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:32:23,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:23,563 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:23,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:32:23,565 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:23,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:23,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1841718534, now seen corresponding path program 1 times [2021-11-21 01:32:23,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:23,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244104508] [2021-11-21 01:32:23,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:23,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:23,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:23,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:32:23,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:23,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244104508] [2021-11-21 01:32:23,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244104508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:23,655 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:23,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:32:23,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430817806] [2021-11-21 01:32:23,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:23,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:32:23,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:23,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:32:23,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:32:23,657 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:32:23,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:23,761 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-11-21 01:32:23,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:32:23,763 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-21 01:32:23,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:23,765 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:32:23,766 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:32:23,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:32:23,769 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:23,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 90 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:32:23,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:32:23,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-21 01:32:23,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:32:23,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-21 01:32:23,780 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2021-11-21 01:32:23,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:23,780 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-21 01:32:23,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:32:23,781 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-21 01:32:23,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:32:23,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:23,782 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:23,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:32:23,782 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:23,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:23,783 INFO L85 PathProgramCache]: Analyzing trace with hash -1224204839, now seen corresponding path program 1 times [2021-11-21 01:32:23,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:23,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008305705] [2021-11-21 01:32:23,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:23,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:23,804 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:32:23,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [584907492] [2021-11-21 01:32:23,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:23,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:23,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:23,819 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:23,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:32:23,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:23,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:32:23,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:24,046 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:32:24,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:32:24,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:24,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008305705] [2021-11-21 01:32:24,048 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:32:24,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584907492] [2021-11-21 01:32:24,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584907492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:24,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:24,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:32:24,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236417509] [2021-11-21 01:32:24,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:24,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:32:24,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:24,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:32:24,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:32:24,051 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:32:26,119 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:32:26,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:26,308 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-11-21 01:32:26,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:32:26,309 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-11-21 01:32:26,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:26,311 INFO L225 Difference]: With dead ends: 47 [2021-11-21 01:32:26,311 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 01:32:26,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:32:26,314 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:26,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 99 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 01:32:26,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 01:32:26,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-21 01:32:26,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 28 states have internal predecessors, (34), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:32:26,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-21 01:32:26,339 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 17 [2021-11-21 01:32:26,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:26,340 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-21 01:32:26,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:32:26,341 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-21 01:32:26,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:32:26,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:26,343 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:26,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:32:26,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:26,571 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:26,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:26,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1437524276, now seen corresponding path program 1 times [2021-11-21 01:32:26,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:26,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132255491] [2021-11-21 01:32:26,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:26,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:26,584 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:32:26,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [132888476] [2021-11-21 01:32:26,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:26,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:26,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:26,586 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:26,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:32:26,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:26,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:32:26,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:26,771 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:32:26,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:32:26,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:26,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132255491] [2021-11-21 01:32:26,772 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:32:26,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132888476] [2021-11-21 01:32:26,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132888476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:26,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:26,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:32:26,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616146522] [2021-11-21 01:32:26,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:26,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:32:26,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:26,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:32:26,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:32:26,775 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:32:26,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:26,836 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-11-21 01:32:26,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:32:26,837 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-21 01:32:26,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:26,839 INFO L225 Difference]: With dead ends: 64 [2021-11-21 01:32:26,839 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:32:26,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:32:26,841 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:26,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 83 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:32:26,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:32:26,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-21 01:32:26,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 35 states have (on average 1.2) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:32:26,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-21 01:32:26,854 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 25 [2021-11-21 01:32:26,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:26,855 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-21 01:32:26,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:32:26,856 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-21 01:32:26,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:32:26,857 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:26,857 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:26,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:32:27,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:32:27,083 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:27,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:27,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1439252154, now seen corresponding path program 1 times [2021-11-21 01:32:27,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:27,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838753620] [2021-11-21 01:32:27,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:27,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:27,114 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:32:27,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1476086139] [2021-11-21 01:32:27,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:27,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:27,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:27,118 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:27,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:32:27,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:27,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:32:27,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:27,554 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:32:27,555 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:32:27,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:27,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838753620] [2021-11-21 01:32:27,555 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:32:27,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476086139] [2021-11-21 01:32:27,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476086139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:32:27,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:32:27,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:32:27,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185126229] [2021-11-21 01:32:27,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:32:27,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:32:27,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:27,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:32:27,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:32:27,559 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:32:29,770 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:32:29,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:29,925 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-11-21 01:32:29,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:32:29,926 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-21 01:32:29,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:29,928 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:32:29,928 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 01:32:29,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:32:29,930 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 10 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:29,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 118 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 47 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:32:29,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 01:32:29,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 01:32:29,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:32:29,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-21 01:32:29,942 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 25 [2021-11-21 01:32:29,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:29,942 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-21 01:32:29,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:32:29,943 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-21 01:32:29,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:32:29,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:29,944 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:29,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:32:30,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:30,163 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:30,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:30,163 INFO L85 PathProgramCache]: Analyzing trace with hash 964329913, now seen corresponding path program 1 times [2021-11-21 01:32:30,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:30,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511527742] [2021-11-21 01:32:30,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:30,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:30,175 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:32:30,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1547742427] [2021-11-21 01:32:30,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:30,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:30,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:30,177 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:30,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:32:30,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:30,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:32:30,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:30,351 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:32:30,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:32:30,497 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:32:30,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:30,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511527742] [2021-11-21 01:32:30,502 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:32:30,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547742427] [2021-11-21 01:32:30,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547742427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:32:30,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597957702] [2021-11-21 01:32:30,529 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:32:30,529 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:32:30,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:32:30,541 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:32:30,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:32:53,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 12 for LOIs [2021-11-21 01:32:53,482 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:33:04,365 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:33:04,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:33:04,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-21 01:33:04,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386666329] [2021-11-21 01:33:04,366 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:33:04,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:33:04,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:33:04,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:33:04,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=354, Unknown=3, NotChecked=0, Total=420 [2021-11-21 01:33:04,368 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:33:06,930 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:33:07,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:33:07,069 INFO L93 Difference]: Finished difference Result 122 states and 144 transitions. [2021-11-21 01:33:07,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:33:07,070 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2021-11-21 01:33:07,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:33:07,071 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:33:07,071 INFO L226 Difference]: Without dead ends: 109 [2021-11-21 01:33:07,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=83, Invalid=466, Unknown=3, NotChecked=0, Total=552 [2021-11-21 01:33:07,073 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 57 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 25 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:33:07,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 122 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 54 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 01:33:07,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-21 01:33:07,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 104. [2021-11-21 01:33:07,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 69 states have internal predecessors, (79), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 01:33:07,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 121 transitions. [2021-11-21 01:33:07,090 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 121 transitions. Word has length 27 [2021-11-21 01:33:07,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:33:07,090 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 121 transitions. [2021-11-21 01:33:07,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:33:07,091 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 121 transitions. [2021-11-21 01:33:07,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:33:07,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:33:07,092 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 01:33:07,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:33:07,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:07,295 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:33:07,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:33:07,295 INFO L85 PathProgramCache]: Analyzing trace with hash -327624414, now seen corresponding path program 1 times [2021-11-21 01:33:07,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:33:07,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345569304] [2021-11-21 01:33:07,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:07,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:33:07,302 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:33:07,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1538525041] [2021-11-21 01:33:07,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:07,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:07,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:33:07,305 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:33:07,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:33:07,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:33:07,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 01:33:07,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:33:07,892 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:33:07,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:33:09,337 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:33:09,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:33:09,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345569304] [2021-11-21 01:33:09,337 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:33:09,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538525041] [2021-11-21 01:33:09,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538525041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:33:09,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467426643] [2021-11-21 01:33:09,340 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 01:33:09,340 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:33:09,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:33:09,341 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:33:09,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:33:30,000 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2021-11-21 01:33:30,100 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:33:40,823 WARN L227 SmtUtils]: Spent 6.51s on a formula simplification. DAG size of input: 91 DAG size of output: 83 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:33:55,326 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:33:55,327 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:33:55,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-11-21 01:33:55,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571115964] [2021-11-21 01:33:55,327 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:33:55,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:33:55,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:33:55,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:33:55,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=344, Unknown=8, NotChecked=0, Total=420 [2021-11-21 01:33:55,329 INFO L87 Difference]: Start difference. First operand 104 states and 121 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 01:34:02,661 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:34:04,994 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:34:05,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:34:05,154 INFO L93 Difference]: Finished difference Result 142 states and 172 transitions. [2021-11-21 01:34:05,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:34:05,159 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 35 [2021-11-21 01:34:05,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:34:05,162 INFO L225 Difference]: With dead ends: 142 [2021-11-21 01:34:05,162 INFO L226 Difference]: Without dead ends: 105 [2021-11-21 01:34:05,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=83, Invalid=415, Unknown=8, NotChecked=0, Total=506 [2021-11-21 01:34:05,164 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 36 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 28 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:34:05,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 132 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 215 Invalid, 2 Unknown, 0 Unchecked, 9.7s Time] [2021-11-21 01:34:05,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-21 01:34:05,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-11-21 01:34:05,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.1515151515151516) internal successors, (76), 69 states have internal predecessors, (76), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 01:34:05,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2021-11-21 01:34:05,186 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 35 [2021-11-21 01:34:05,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:34:05,186 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2021-11-21 01:34:05,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 01:34:05,187 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2021-11-21 01:34:05,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 01:34:05,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:34:05,189 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:34:05,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:34:05,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:34:05,389 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:34:05,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:34:05,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1605911421, now seen corresponding path program 1 times [2021-11-21 01:34:05,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:34:05,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757989977] [2021-11-21 01:34:05,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:05,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:34:05,399 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:34:05,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [155259025] [2021-11-21 01:34:05,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:05,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:34:05,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:34:05,416 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:34:05,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:34:05,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:34:05,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:34:05,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:34:05,651 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:34:05,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:34:05,793 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:34:05,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:34:05,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757989977] [2021-11-21 01:34:05,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:34:05,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155259025] [2021-11-21 01:34:05,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155259025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:34:05,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1732255551] [2021-11-21 01:34:05,796 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:34:05,796 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:34:05,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:34:05,797 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:34:05,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:34:30,994 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 12 for LOIs [2021-11-21 01:34:31,103 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:34:52,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:34:52,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:34:52,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-21 01:34:52,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108704584] [2021-11-21 01:34:52,153 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:34:52,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:34:52,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:34:52,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:34:52,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=424, Unknown=6, NotChecked=0, Total=506 [2021-11-21 01:34:52,155 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:34:55,049 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:34:55,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:34:55,279 INFO L93 Difference]: Finished difference Result 190 states and 223 transitions. [2021-11-21 01:34:55,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:34:55,280 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 43 [2021-11-21 01:34:55,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:34:55,282 INFO L225 Difference]: With dead ends: 190 [2021-11-21 01:34:55,282 INFO L226 Difference]: Without dead ends: 176 [2021-11-21 01:34:55,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=95, Invalid=549, Unknown=6, NotChecked=0, Total=650 [2021-11-21 01:34:55,284 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 75 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 35 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:34:55,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 181 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 113 Invalid, 1 Unknown, 0 Unchecked, 3.0s Time] [2021-11-21 01:34:55,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-21 01:34:55,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 169. [2021-11-21 01:34:55,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 108 states have (on average 1.1481481481481481) internal successors, (124), 114 states have internal predecessors, (124), 38 states have call successors, (38), 22 states have call predecessors, (38), 22 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-21 01:34:55,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 197 transitions. [2021-11-21 01:34:55,303 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 197 transitions. Word has length 43 [2021-11-21 01:34:55,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:34:55,304 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 197 transitions. [2021-11-21 01:34:55,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:34:55,304 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 197 transitions. [2021-11-21 01:34:55,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 01:34:55,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:34:55,306 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:34:55,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 01:34:55,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:34:55,519 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:34:55,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:34:55,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1607639299, now seen corresponding path program 1 times [2021-11-21 01:34:55,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:34:55,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101716506] [2021-11-21 01:34:55,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:55,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:34:55,534 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:34:55,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [103263834] [2021-11-21 01:34:55,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:55,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:34:55,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:34:55,536 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:34:55,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:34:55,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:34:55,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 01:34:55,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:34:55,984 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:34:55,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:34:57,010 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:34:57,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:34:57,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101716506] [2021-11-21 01:34:57,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:34:57,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103263834] [2021-11-21 01:34:57,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103263834] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:34:57,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:34:57,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 8 [2021-11-21 01:34:57,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689028985] [2021-11-21 01:34:57,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:34:57,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:34:57,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:34:57,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:34:57,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:34:57,013 INFO L87 Difference]: Start difference. First operand 169 states and 197 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:34:59,136 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:34:59,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:34:59,332 INFO L93 Difference]: Finished difference Result 192 states and 225 transitions. [2021-11-21 01:34:59,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:34:59,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2021-11-21 01:34:59,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:34:59,335 INFO L225 Difference]: With dead ends: 192 [2021-11-21 01:34:59,335 INFO L226 Difference]: Without dead ends: 190 [2021-11-21 01:34:59,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:34:59,336 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 15 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:34:59,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 94 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 27 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:34:59,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-21 01:34:59,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 181. [2021-11-21 01:34:59,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 123 states have internal predecessors, (132), 38 states have call successors, (38), 25 states have call predecessors, (38), 25 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-21 01:34:59,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 205 transitions. [2021-11-21 01:34:59,358 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 205 transitions. Word has length 43 [2021-11-21 01:34:59,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:34:59,359 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 205 transitions. [2021-11-21 01:34:59,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:34:59,359 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 205 transitions. [2021-11-21 01:34:59,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 01:34:59,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:34:59,362 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:34:59,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:34:59,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:34:59,580 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:34:59,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:34:59,581 INFO L85 PathProgramCache]: Analyzing trace with hash -2003316837, now seen corresponding path program 1 times [2021-11-21 01:34:59,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:34:59,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085661913] [2021-11-21 01:34:59,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:59,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:34:59,589 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:34:59,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1022319039] [2021-11-21 01:34:59,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:34:59,590 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:34:59,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:34:59,591 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:34:59,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8222acd-0d41-4fb5-a69d-a7266783d1a2/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process