./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/min-2-u.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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/min-2-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/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 68785685c781649dca8a870a36ccbd5837fb99f65c0418361b1a73f7848e1bda --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:37:25,611 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:37:25,613 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:37:25,659 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:37:25,660 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:37:25,664 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:37:25,667 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:37:25,671 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:37:25,673 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:37:25,679 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:37:25,680 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:37:25,682 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:37:25,682 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:37:25,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:37:25,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:37:25,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:37:25,690 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:37:25,691 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:37:25,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:37:25,703 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:37:25,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:37:25,707 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:37:25,710 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:37:25,711 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:37:25,720 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:37:25,720 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:37:25,720 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:37:25,722 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:37:25,723 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:37:25,725 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:37:25,725 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:37:25,726 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:37:25,728 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:37:25,729 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:37:25,730 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:37:25,731 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:37:25,731 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:37:25,731 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:37:25,732 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:37:25,733 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:37:25,733 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:37:25,734 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:37:25,777 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:37:25,777 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:37:25,778 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:37:25,778 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:37:25,785 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:37:25,785 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:37:25,785 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:37:25,785 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:37:25,785 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:37:25,785 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:37:25,787 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:37:25,787 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:37:25,787 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:37:25,787 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:37:25,787 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:37:25,788 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:37:25,788 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:37:25,788 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:37:25,789 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:37:25,791 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:37:25,791 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:37:25,796 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:37:25,796 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:37:25,796 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:37:25,797 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:37:25,797 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:37:25,797 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:37:25,797 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:37:25,797 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:37:25,798 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:37:25,798 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:37:25,798 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:37:25,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:25,799 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:37:25,799 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:37:25,799 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:37:25,799 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:37:25,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:37:25,800 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:37:25,800 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:37:25,800 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:37:25,800 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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68785685c781649dca8a870a36ccbd5837fb99f65c0418361b1a73f7848e1bda [2021-11-20 23:37:26,068 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:37:26,090 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:37:26,093 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:37:26,094 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:37:26,095 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:37:26,096 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-multidimensional/min-2-u.c [2021-11-20 23:37:26,171 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/data/42109a216/aceba1946e4a4e6eb5833cb0950056f8/FLAG1c231e6ee [2021-11-20 23:37:26,604 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:37:26,605 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/sv-benchmarks/c/array-multidimensional/min-2-u.c [2021-11-20 23:37:26,615 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/data/42109a216/aceba1946e4a4e6eb5833cb0950056f8/FLAG1c231e6ee [2021-11-20 23:37:27,004 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/data/42109a216/aceba1946e4a4e6eb5833cb0950056f8 [2021-11-20 23:37:27,007 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:37:27,008 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:37:27,010 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:27,010 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:37:27,013 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:37:27,014 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,015 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c50775b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27, skipping insertion in model container [2021-11-20 23:37:27,015 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,022 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:37:27,037 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:37:27,188 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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2021-11-20 23:37:27,205 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:27,213 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:37:27,223 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_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2021-11-20 23:37:27,231 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:27,244 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:37:27,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27 WrapperNode [2021-11-20 23:37:27,245 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:27,245 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:27,245 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:37:27,246 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:37:27,253 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,260 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,280 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-20 23:37:27,280 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:27,281 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:37:27,281 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:37:27,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:37:27,289 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,289 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,291 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,292 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,322 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,327 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:37:27,337 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:37:27,337 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:37:27,337 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:37:27,338 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (1/1) ... [2021-11-20 23:37:27,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:27,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:27,375 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:37:27,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:37:27,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:37:27,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:37:27,425 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:37:27,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:37:27,425 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:37:27,425 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:37:27,426 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:37:27,426 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:37:27,497 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:37:27,498 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:37:27,656 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:37:27,721 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:37:27,727 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-20 23:37:27,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:27 BoogieIcfgContainer [2021-11-20 23:37:27,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:37:27,747 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:37:27,747 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:37:27,751 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:37:27,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:37:27" (1/3) ... [2021-11-20 23:37:27,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55e73372 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:27, skipping insertion in model container [2021-11-20 23:37:27,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:27" (2/3) ... [2021-11-20 23:37:27,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55e73372 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:27, skipping insertion in model container [2021-11-20 23:37:27,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:27" (3/3) ... [2021-11-20 23:37:27,754 INFO L111 eAbstractionObserver]: Analyzing ICFG min-2-u.c [2021-11-20 23:37:27,759 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:37:27,759 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:37:27,809 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:37:27,817 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:37:27,817 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:37:27,832 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:27,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:37:27,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:27,838 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:27,840 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:27,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:27,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1895355255, now seen corresponding path program 1 times [2021-11-20 23:37:27,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:27,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804326909] [2021-11-20 23:37:27,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:27,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:27,930 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:27,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1300215448] [2021-11-20 23:37:27,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:27,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:27,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:27,933 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:27,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:37:28,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:28,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:37:28,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:28,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:28,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:37:28,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:28,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804326909] [2021-11-20 23:37:28,154 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:28,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300215448] [2021-11-20 23:37:28,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300215448] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:28,158 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:28,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:37:28,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211040168] [2021-11-20 23:37:28,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:28,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:37:28,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:28,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:37:28,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:37:28,206 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:28,253 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2021-11-20 23:37:28,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:37:28,256 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-20 23:37:28,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:28,263 INFO L225 Difference]: With dead ends: 23 [2021-11-20 23:37:28,264 INFO L226 Difference]: Without dead ends: 13 [2021-11-20 23:37:28,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:37:28,270 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:28,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:28,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-20 23:37:28,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-11-20 23:37:28,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2021-11-20 23:37:28,299 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 7 [2021-11-20 23:37:28,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:28,300 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2021-11-20 23:37:28,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,300 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2021-11-20 23:37:28,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:37:28,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:28,301 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:28,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-20 23:37:28,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-20 23:37:28,515 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:28,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:28,516 INFO L85 PathProgramCache]: Analyzing trace with hash 3009601, now seen corresponding path program 1 times [2021-11-20 23:37:28,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:28,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079001059] [2021-11-20 23:37:28,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:28,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:28,523 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:28,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [573099496] [2021-11-20 23:37:28,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:28,524 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:28,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:28,525 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:28,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:37:28,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:28,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:37:28,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:28,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:28,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:37:28,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:28,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079001059] [2021-11-20 23:37:28,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:28,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573099496] [2021-11-20 23:37:28,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573099496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:28,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:28,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:37:28,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449573067] [2021-11-20 23:37:28,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:28,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:37:28,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:28,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:37:28,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:28,633 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:28,677 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2021-11-20 23:37:28,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:37:28,678 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:37:28,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:28,679 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:37:28,679 INFO L226 Difference]: Without dead ends: 21 [2021-11-20 23:37:28,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:37:28,681 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:28,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 7 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:28,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-20 23:37:28,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2021-11-20 23:37:28,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2021-11-20 23:37:28,688 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 9 [2021-11-20 23:37:28,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:28,689 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2021-11-20 23:37:28,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,689 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2021-11-20 23:37:28,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:37:28,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:28,690 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:28,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:28,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:28,910 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:28,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:28,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1218994391, now seen corresponding path program 1 times [2021-11-20 23:37:28,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:28,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723318316] [2021-11-20 23:37:28,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:28,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:28,916 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:28,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774364105] [2021-11-20 23:37:28,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:28,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:28,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:28,923 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:28,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:37:28,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:28,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:37:29,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:29,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:29,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:29,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:29,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723318316] [2021-11-20 23:37:29,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:29,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774364105] [2021-11-20 23:37:29,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774364105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:29,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1397800628] [2021-11-20 23:37:29,198 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:37:29,198 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:29,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:29,207 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:29,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:29,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:29,329 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-20 23:37:29,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-20 23:37:29,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:29,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:29,455 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:29,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:29,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:29,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-11-20 23:37:30,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:30,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:30,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:30,293 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-20 23:37:30,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 251 treesize of output 234 [2021-11-20 23:37:30,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:30,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:31,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:31,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1397800628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:31,571 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:31,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 10 [2021-11-20 23:37:31,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738518391] [2021-11-20 23:37:31,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:31,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:37:31,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:31,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:37:31,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:37:31,573 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:31,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:31,663 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2021-11-20 23:37:31,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:31,664 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:37:31,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:31,665 INFO L225 Difference]: With dead ends: 25 [2021-11-20 23:37:31,665 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:37:31,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:37:31,667 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:31,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 9 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:31,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:37:31,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2021-11-20 23:37:31,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:31,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2021-11-20 23:37:31,675 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 10 [2021-11-20 23:37:31,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:31,675 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2021-11-20 23:37:31,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:31,676 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2021-11-20 23:37:31,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:37:31,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:31,676 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:31,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:31,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:31,887 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:31,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:31,887 INFO L85 PathProgramCache]: Analyzing trace with hash 2094588570, now seen corresponding path program 1 times [2021-11-20 23:37:31,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:31,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703602679] [2021-11-20 23:37:31,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:31,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:31,893 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:31,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1401477807] [2021-11-20 23:37:31,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:31,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:31,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:31,894 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:31,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:37:31,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:31,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:37:31,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:32,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:37:32,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:32,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:37:32,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:32,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703602679] [2021-11-20 23:37:32,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:32,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401477807] [2021-11-20 23:37:32,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401477807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:32,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400148558] [2021-11-20 23:37:32,083 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:32,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:32,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:32,084 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:32,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:32,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:32,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:32,141 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:32,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:32,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:32,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-20 23:37:32,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:32,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 42 [2021-11-20 23:37:32,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:32,569 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:32,606 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-20 23:37:32,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 243 treesize of output 236 [2021-11-20 23:37:33,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:33,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:35,185 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:35,624 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:35,624 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:35,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-20 23:37:35,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275487851] [2021-11-20 23:37:35,625 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:35,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:37:35,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:35,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:37:35,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:37:35,627 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:35,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:35,755 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2021-11-20 23:37:35,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:37:35,755 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-20 23:37:35,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:35,756 INFO L225 Difference]: With dead ends: 52 [2021-11-20 23:37:35,756 INFO L226 Difference]: Without dead ends: 38 [2021-11-20 23:37:35,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-11-20 23:37:35,758 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 76 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:35,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 13 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:35,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-20 23:37:35,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2021-11-20 23:37:35,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:35,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2021-11-20 23:37:35,769 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 13 [2021-11-20 23:37:35,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:35,769 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2021-11-20 23:37:35,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:35,770 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2021-11-20 23:37:35,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:37:35,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:35,771 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:35,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:35,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:35,987 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:35,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:35,987 INFO L85 PathProgramCache]: Analyzing trace with hash -535283115, now seen corresponding path program 2 times [2021-11-20 23:37:35,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:35,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9270011] [2021-11-20 23:37:35,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:35,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:35,992 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:35,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1379507004] [2021-11-20 23:37:35,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:35,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:35,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:35,994 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:35,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:37:36,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:37:36,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:36,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:37:36,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:36,108 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:37:36,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:36,157 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:37:36,158 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:36,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9270011] [2021-11-20 23:37:36,161 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:36,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379507004] [2021-11-20 23:37:36,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379507004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:36,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2021821833] [2021-11-20 23:37:36,168 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:36,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:36,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:36,169 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:36,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:36,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,214 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-20 23:37:36,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-20 23:37:36,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,262 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:36,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:36,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-11-20 23:37:36,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:36,798 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-20 23:37:36,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 251 treesize of output 234 [2021-11-20 23:37:37,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:37,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:38,885 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:39,222 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:39,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:39,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 5 [2021-11-20 23:37:39,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691095648] [2021-11-20 23:37:39,223 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:39,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:37:39,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:39,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:37:39,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:37:39,224 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:39,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:39,279 INFO L93 Difference]: Finished difference Result 72 states and 92 transitions. [2021-11-20 23:37:39,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:37:39,279 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-20 23:37:39,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:39,281 INFO L225 Difference]: With dead ends: 72 [2021-11-20 23:37:39,281 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:37:39,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:37:39,282 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 8 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:39,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 15 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:39,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:37:39,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-20 23:37:39,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:39,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2021-11-20 23:37:39,297 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 19 [2021-11-20 23:37:39,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:39,297 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2021-11-20 23:37:39,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:39,298 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2021-11-20 23:37:39,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:37:39,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:39,299 INFO L514 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:39,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:39,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:39,507 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:39,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:39,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1457403469, now seen corresponding path program 3 times [2021-11-20 23:37:39,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:39,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405077624] [2021-11-20 23:37:39,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:39,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:39,511 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:39,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [144676854] [2021-11-20 23:37:39,511 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:39,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:39,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:39,530 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:39,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:37:39,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:39,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:39,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:37:39,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:39,723 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-20 23:37:39,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:39,825 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-20 23:37:39,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:39,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405077624] [2021-11-20 23:37:39,825 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:39,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144676854] [2021-11-20 23:37:39,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144676854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:39,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107973825] [2021-11-20 23:37:39,828 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:39,829 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:39,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:39,829 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:39,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:39,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:39,886 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-20 23:37:39,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-20 23:37:39,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:39,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:39,937 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:39,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:40,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:40,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 42 [2021-11-20 23:37:40,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:40,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:40,335 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-20 23:37:40,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 243 treesize of output 236 [2021-11-20 23:37:40,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:40,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:42,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:42,890 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:42,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:42,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-20 23:37:42,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277940856] [2021-11-20 23:37:42,891 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:42,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:37:42,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:42,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:37:42,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=335, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:37:42,893 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:43,332 INFO L93 Difference]: Finished difference Result 154 states and 181 transitions. [2021-11-20 23:37:43,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:37:43,333 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-20 23:37:43,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:43,335 INFO L225 Difference]: With dead ends: 154 [2021-11-20 23:37:43,335 INFO L226 Difference]: Without dead ends: 138 [2021-11-20 23:37:43,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:37:43,337 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 96 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:43,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 76 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:37:43,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-20 23:37:43,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 67. [2021-11-20 23:37:43,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2272727272727273) internal successors, (81), 66 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2021-11-20 23:37:43,358 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 37 [2021-11-20 23:37:43,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:43,358 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2021-11-20 23:37:43,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,359 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2021-11-20 23:37:43,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-20 23:37:43,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:43,361 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:43,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:43,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:43,579 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:43,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:43,579 INFO L85 PathProgramCache]: Analyzing trace with hash -1873871377, now seen corresponding path program 4 times [2021-11-20 23:37:43,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:43,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122504034] [2021-11-20 23:37:43,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:43,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:43,586 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:43,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [247084770] [2021-11-20 23:37:43,587 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:43,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:43,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:43,588 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:43,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:37:43,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:43,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:37:43,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:43,809 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-20 23:37:43,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:43,947 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-20 23:37:43,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:43,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122504034] [2021-11-20 23:37:43,948 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:43,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247084770] [2021-11-20 23:37:43,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247084770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:43,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398183521] [2021-11-20 23:37:43,951 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:43,951 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:43,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:43,954 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:43,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:43,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:43,990 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-20 23:37:43,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-20 23:37:44,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:44,046 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:44,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:44,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:44,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-11-20 23:37:44,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:44,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:44,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:44,522 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-20 23:37:44,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 251 treesize of output 234 [2021-11-20 23:37:44,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:44,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:46,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:47,074 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:47,074 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:47,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-11-20 23:37:47,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323889200] [2021-11-20 23:37:47,075 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:47,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:37:47,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:47,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:37:47,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:37:47,076 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:47,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:47,336 INFO L93 Difference]: Finished difference Result 212 states and 290 transitions. [2021-11-20 23:37:47,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:37:47,336 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-20 23:37:47,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:47,341 INFO L225 Difference]: With dead ends: 212 [2021-11-20 23:37:47,342 INFO L226 Difference]: Without dead ends: 152 [2021-11-20 23:37:47,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=231, Invalid=369, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:37:47,348 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 126 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:47,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 31 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:47,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-20 23:37:47,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 133. [2021-11-20 23:37:47,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.1590909090909092) internal successors, (153), 132 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:47,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 153 transitions. [2021-11-20 23:37:47,411 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 153 transitions. Word has length 55 [2021-11-20 23:37:47,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:47,411 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 153 transitions. [2021-11-20 23:37:47,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:47,412 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 153 transitions. [2021-11-20 23:37:47,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-20 23:37:47,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:47,421 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:47,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:47,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:47,635 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:47,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:47,635 INFO L85 PathProgramCache]: Analyzing trace with hash 912324207, now seen corresponding path program 5 times [2021-11-20 23:37:47,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:47,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129720493] [2021-11-20 23:37:47,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:47,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:47,644 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:47,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [948703403] [2021-11-20 23:37:47,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:47,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:47,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:47,646 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:47,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:37:50,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:37:50,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:50,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:37:50,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:50,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-20 23:37:50,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:51,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 4 proven. 418 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-20 23:37:51,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:51,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129720493] [2021-11-20 23:37:51,302 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:51,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948703403] [2021-11-20 23:37:51,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948703403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:51,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [365959848] [2021-11-20 23:37:51,304 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:51,304 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:51,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:51,305 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:51,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:51,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,340 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:51,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:51,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-20 23:37:51,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-11-20 23:37:51,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:51,794 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-20 23:37:51,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 251 treesize of output 234 [2021-11-20 23:37:52,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:52,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:54,094 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:54,550 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:54,550 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:37:54,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2021-11-20 23:37:54,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244927382] [2021-11-20 23:37:54,551 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:54,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:37:54,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:54,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:37:54,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=588, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:37:54,552 INFO L87 Difference]: Start difference. First operand 133 states and 153 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:55,085 INFO L93 Difference]: Finished difference Result 428 states and 566 transitions. [2021-11-20 23:37:55,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:37:55,086 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-20 23:37:55,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:55,088 INFO L225 Difference]: With dead ends: 428 [2021-11-20 23:37:55,088 INFO L226 Difference]: Without dead ends: 308 [2021-11-20 23:37:55,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=723, Invalid=1083, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:37:55,094 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 436 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 282 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 436 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 282 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:55,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [436 Valid, 67 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [282 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:37:55,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-20 23:37:55,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 265. [2021-11-20 23:37:55,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.125) internal successors, (297), 264 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 297 transitions. [2021-11-20 23:37:55,146 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 297 transitions. Word has length 103 [2021-11-20 23:37:55,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:55,146 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 297 transitions. [2021-11-20 23:37:55,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,147 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 297 transitions. [2021-11-20 23:37:55,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-20 23:37:55,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:55,151 INFO L514 BasicCegarLoop]: trace histogram [88, 88, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:55,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:55,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:37:55,372 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:55,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:55,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1637734545, now seen corresponding path program 6 times [2021-11-20 23:37:55,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:55,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48578653] [2021-11-20 23:37:55,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:55,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:55,386 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:37:55,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1563220412] [2021-11-20 23:37:55,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:55,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:55,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:55,388 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:55,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:37:55,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:55,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:55,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-20 23:37:55,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:56,511 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-20 23:37:56,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:57,361 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-20 23:37:57,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:57,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48578653] [2021-11-20 23:37:57,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:37:57,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563220412] [2021-11-20 23:37:57,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563220412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:57,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [510470272] [2021-11-20 23:37:57,364 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:57,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:57,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:57,365 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:57,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:57,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:57,403 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-20 23:37:57,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2021-11-20 23:37:57,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:57,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:57,461 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:37:57,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:37:57,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:57,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 42 [2021-11-20 23:37:57,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:57,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:57,825 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-20 23:37:57,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 243 treesize of output 236 [2021-11-20 23:37:58,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:58,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:37:59,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:00,473 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:00,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:38:00,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 58 [2021-11-20 23:38:00,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537531788] [2021-11-20 23:38:00,474 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:00,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:38:00,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:00,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:38:00,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=2771, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:38:00,478 INFO L87 Difference]: Start difference. First operand 265 states and 297 transitions. Second operand has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:04,479 INFO L93 Difference]: Finished difference Result 1437 states and 1647 transitions. [2021-11-20 23:38:04,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-20 23:38:04,479 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-11-20 23:38:04,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:04,488 INFO L225 Difference]: With dead ends: 1437 [2021-11-20 23:38:04,489 INFO L226 Difference]: Without dead ends: 1367 [2021-11-20 23:38:04,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 777 GetRequests, 611 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10967 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=8544, Invalid=19512, Unknown=0, NotChecked=0, Total=28056 [2021-11-20 23:38:04,498 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 476 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1036 mSolverCounterSat, 542 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 712 SdHoareTripleChecker+Invalid, 1578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 542 IncrementalHoareTripleChecker+Valid, 1036 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:04,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [476 Valid, 712 Invalid, 1578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [542 Valid, 1036 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:38:04,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1367 states. [2021-11-20 23:38:04,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1367 to 409. [2021-11-20 23:38:04,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 1.0955882352941178) internal successors, (447), 408 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 447 transitions. [2021-11-20 23:38:04,578 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 447 transitions. Word has length 199 [2021-11-20 23:38:04,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:04,579 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 447 transitions. [2021-11-20 23:38:04,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,580 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 447 transitions. [2021-11-20 23:38:04,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-20 23:38:04,586 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:04,587 INFO L514 BasicCegarLoop]: trace histogram [220, 88, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:04,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-20 23:38:04,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:04,803 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:04,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:04,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1688486183, now seen corresponding path program 7 times [2021-11-20 23:38:04,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:04,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649172624] [2021-11-20 23:38:04,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:04,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:04,823 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:38:04,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1735205101] [2021-11-20 23:38:04,824 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:04,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:04,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:04,825 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:04,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:38:05,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:05,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 1558 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:38:05,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:05,973 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2021-11-20 23:38:05,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:07,239 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2021-11-20 23:38:07,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:07,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649172624] [2021-11-20 23:38:07,240 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:38:07,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735205101] [2021-11-20 23:38:07,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735205101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:07,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1657089187] [2021-11-20 23:38:07,242 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:07,242 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:07,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:07,242 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:07,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:07,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,281 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:38:07,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:38:07,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2021-11-20 23:38:07,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-11-20 23:38:07,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,742 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-20 23:38:07,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 251 treesize of output 234 [2021-11-20 23:38:08,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:38:08,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-20 23:38:09,758 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:10,165 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:10,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:38:10,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 49 [2021-11-20 23:38:10,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234401481] [2021-11-20 23:38:10,166 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:10,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:38:10,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:10,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:38:10,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1352, Invalid=1728, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:38:10,169 INFO L87 Difference]: Start difference. First operand 409 states and 447 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:12,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:12,147 INFO L93 Difference]: Finished difference Result 1292 states and 1706 transitions. [2021-11-20 23:38:12,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:38:12,148 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 343 [2021-11-20 23:38:12,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:12,153 INFO L225 Difference]: With dead ends: 1292 [2021-11-20 23:38:12,153 INFO L226 Difference]: Without dead ends: 908 [2021-11-20 23:38:12,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1731 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2571, Invalid=3591, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:38:12,157 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 768 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 576 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 768 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 576 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:12,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [768 Valid, 139 Invalid, 783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [576 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:38:12,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2021-11-20 23:38:12,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 817. [2021-11-20 23:38:12,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 817 states, 816 states have (on average 1.0772058823529411) internal successors, (879), 816 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:12,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 817 states to 817 states and 879 transitions. [2021-11-20 23:38:12,299 INFO L78 Accepts]: Start accepts. Automaton has 817 states and 879 transitions. Word has length 343 [2021-11-20 23:38:12,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:12,299 INFO L470 AbstractCegarLoop]: Abstraction has 817 states and 879 transitions. [2021-11-20 23:38:12,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:12,300 INFO L276 IsEmpty]: Start isEmpty. Operand 817 states and 879 transitions. [2021-11-20 23:38:12,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 680 [2021-11-20 23:38:12,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:12,321 INFO L514 BasicCegarLoop]: trace histogram [460, 184, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:12,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:12,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:38:12,545 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:12,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:12,546 INFO L85 PathProgramCache]: Analyzing trace with hash 370398759, now seen corresponding path program 8 times [2021-11-20 23:38:12,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:12,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796933221] [2021-11-20 23:38:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:12,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:12,574 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:38:12,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [11477181] [2021-11-20 23:38:12,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:12,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:12,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:12,576 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:12,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66e016b2-7ae0-40ab-b32c-73b7eba2ff58/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process