./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl --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 61ee7f467544bc9f9ea1f0d9fd399b9972cb81a4a1640bca414247c42e8cc99d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:48:10,506 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:48:10,509 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:48:10,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:48:10,567 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:48:10,569 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:48:10,570 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:48:10,573 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:48:10,575 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:48:10,577 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:48:10,578 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:48:10,580 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:48:10,580 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:48:10,582 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:48:10,584 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:48:10,597 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:48:10,602 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:48:10,605 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:48:10,608 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:48:10,613 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:48:10,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:48:10,620 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:48:10,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:48:10,625 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:48:10,629 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:48:10,636 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:48:10,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:48:10,638 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:48:10,640 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:48:10,642 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:48:10,643 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:48:10,644 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:48:10,646 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:48:10,648 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:48:10,649 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:48:10,650 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:48:10,651 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:48:10,651 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:48:10,651 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:48:10,652 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:48:10,653 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:48:10,654 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:48:10,702 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:48:10,703 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:48:10,704 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:48:10,704 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:48:10,705 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:48:10,705 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:48:10,706 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:48:10,706 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:48:10,706 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:48:10,707 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:48:10,708 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:48:10,708 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:48:10,708 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:48:10,709 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:48:10,709 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:48:10,709 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:48:10,709 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:48:10,710 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:48:10,710 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:48:10,711 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:48:10,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:48:10,711 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:48:10,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:48:10,712 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:48:10,712 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:48:10,712 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:48:10,712 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:48:10,713 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:48:10,713 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:48:10,713 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:48:10,713 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:48:10,714 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:48:10,714 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:48:10,714 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:48:10,715 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:48:10,715 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:48:10,715 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:48:10,715 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:48:10,716 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:48:10,716 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:48:10,716 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:48:10,716 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 61ee7f467544bc9f9ea1f0d9fd399b9972cb81a4a1640bca414247c42e8cc99d [2021-11-23 16:48:11,000 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:48:11,040 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:48:11,043 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:48:11,045 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:48:11,045 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:48:11,047 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c [2021-11-23 16:48:11,117 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/a41cd8575/7a6822cbb2b84f528b8f27bcc736664f/FLAG9daf823d3 [2021-11-23 16:48:11,698 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:48:11,699 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c [2021-11-23 16:48:11,711 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/a41cd8575/7a6822cbb2b84f528b8f27bcc736664f/FLAG9daf823d3 [2021-11-23 16:48:12,041 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/a41cd8575/7a6822cbb2b84f528b8f27bcc736664f [2021-11-23 16:48:12,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:48:12,046 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:48:12,047 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:48:12,048 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:48:12,051 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:48:12,052 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@272ac967 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12, skipping insertion in model container [2021-11-23 16:48:12,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:48:12,085 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:48:12,265 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c[415,428] [2021-11-23 16:48:12,281 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:48:12,290 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:48:12,317 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c[415,428] [2021-11-23 16:48:12,328 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:48:12,347 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:48:12,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12 WrapperNode [2021-11-23 16:48:12,349 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:48:12,350 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:48:12,351 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:48:12,351 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:48:12,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,369 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,393 INFO L137 Inliner]: procedures = 15, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 53 [2021-11-23 16:48:12,394 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:48:12,395 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:48:12,395 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:48:12,395 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:48:12,405 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,405 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,417 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,432 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,439 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,442 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:48:12,448 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:48:12,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:48:12,449 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:48:12,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:12" (1/1) ... [2021-11-23 16:48:12,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:48:12,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:12,481 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:48:12,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:48:12,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:48:12,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:48:12,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 16:48:12,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 16:48:12,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:48:12,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:48:12,539 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 16:48:12,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 16:48:12,615 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:48:12,617 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:48:12,738 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:48:12,764 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:48:12,772 INFO L158 Benchmark]: Toolchain (without parser) took 725.21ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 86.6MB in the beginning and 102.6MB in the end (delta: -16.0MB). Peak memory consumption was 8.7MB. Max. memory is 16.1GB. [2021-11-23 16:48:12,773 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 117.4MB. Free memory is still 70.8MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:48:12,774 INFO L158 Benchmark]: CACSL2BoogieTranslator took 302.10ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 86.6MB in the beginning and 115.2MB in the end (delta: -28.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 16:48:12,775 INFO L158 Benchmark]: Boogie Procedure Inliner took 44.01ms. Allocated memory is still 142.6MB. Free memory was 115.2MB in the beginning and 113.7MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:48:12,776 INFO L158 Benchmark]: Boogie Preprocessor took 52.41ms. Allocated memory is still 142.6MB. Free memory was 113.7MB in the beginning and 112.6MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 16:48:12,778 INFO L158 Benchmark]: RCFGBuilder took 321.81ms. Allocated memory is still 142.6MB. Free memory was 112.6MB in the beginning and 102.6MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 16:48:12,782 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 117.4MB. Free memory is still 70.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 302.10ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 86.6MB in the beginning and 115.2MB in the end (delta: -28.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 44.01ms. Allocated memory is still 142.6MB. Free memory was 115.2MB in the beginning and 113.7MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 52.41ms. Allocated memory is still 142.6MB. Free memory was 113.7MB in the beginning and 112.6MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 321.81ms. Allocated memory is still 142.6MB. Free memory was 112.6MB in the beginning and 102.6MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:48:12,824 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl --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 61ee7f467544bc9f9ea1f0d9fd399b9972cb81a4a1640bca414247c42e8cc99d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:48:15,279 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:48:15,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:48:15,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:48:15,322 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:48:15,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:48:15,331 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:48:15,336 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:48:15,340 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:48:15,348 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:48:15,350 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:48:15,351 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:48:15,353 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:48:15,356 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:48:15,359 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:48:15,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:48:15,364 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:48:15,365 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:48:15,388 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:48:15,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:48:15,398 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:48:15,399 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:48:15,403 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:48:15,405 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:48:15,417 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:48:15,417 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:48:15,418 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:48:15,420 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:48:15,421 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:48:15,422 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:48:15,423 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:48:15,424 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:48:15,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:48:15,427 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:48:15,429 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:48:15,429 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:48:15,431 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:48:15,431 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:48:15,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:48:15,434 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:48:15,434 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:48:15,440 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:48:15,484 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:48:15,484 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:48:15,485 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:48:15,485 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:48:15,486 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:48:15,487 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:48:15,487 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:48:15,487 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:48:15,488 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:48:15,488 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:48:15,489 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:48:15,490 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:48:15,491 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:48:15,491 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:48:15,492 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:48:15,492 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:48:15,492 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:48:15,493 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:48:15,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:48:15,493 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:48:15,494 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:48:15,494 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:48:15,494 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:48:15,494 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:48:15,495 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:48:15,495 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:48:15,495 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:48:15,496 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:48:15,496 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:48:15,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:48:15,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:48:15,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:48:15,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:48:15,498 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:48:15,498 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:15,499 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:48:15,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:48:15,499 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:48:15,500 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 61ee7f467544bc9f9ea1f0d9fd399b9972cb81a4a1640bca414247c42e8cc99d [2021-11-23 16:48:15,998 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:48:16,032 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:48:16,036 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:48:16,037 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:48:16,038 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:48:16,040 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c [2021-11-23 16:48:16,127 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/3c41980c9/25ed0925af8c4716a0cb5d6bb2d6b91f/FLAG6b76982f3 [2021-11-23 16:48:16,726 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:48:16,727 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c [2021-11-23 16:48:16,734 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/3c41980c9/25ed0925af8c4716a0cb5d6bb2d6b91f/FLAG6b76982f3 [2021-11-23 16:48:17,070 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/data/3c41980c9/25ed0925af8c4716a0cb5d6bb2d6b91f [2021-11-23 16:48:17,075 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:48:17,077 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:48:17,080 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:48:17,081 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:48:17,085 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:48:17,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,089 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@131cc52b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17, skipping insertion in model container [2021-11-23 16:48:17,089 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,097 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:48:17,116 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:48:17,299 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c[415,428] [2021-11-23 16:48:17,319 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:48:17,330 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:48:17,347 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_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/sv-benchmarks/c/array-cav19/array_init_var_plus_ind2.c[415,428] [2021-11-23 16:48:17,360 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:48:17,406 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:48:17,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17 WrapperNode [2021-11-23 16:48:17,407 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:48:17,408 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:48:17,409 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:48:17,409 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:48:17,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,430 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,447 INFO L137 Inliner]: procedures = 17, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 52 [2021-11-23 16:48:17,448 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:48:17,449 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:48:17,449 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:48:17,449 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:48:17,457 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,457 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,470 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,471 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,485 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,495 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,497 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:48:17,500 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:48:17,500 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:48:17,500 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:48:17,501 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (1/1) ... [2021-11-23 16:48:17,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:48:17,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:17,529 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:48:17,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:48:17,579 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:48:17,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 16:48:17,580 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 16:48:17,672 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:48:17,674 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:48:17,842 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:48:17,848 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:48:17,848 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 16:48:17,850 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:48:17 BoogieIcfgContainer [2021-11-23 16:48:17,851 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:48:17,853 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:48:17,853 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:48:17,856 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:48:17,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:48:17" (1/3) ... [2021-11-23 16:48:17,857 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3387fd30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:48:17, skipping insertion in model container [2021-11-23 16:48:17,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:48:17" (2/3) ... [2021-11-23 16:48:17,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3387fd30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:48:17, skipping insertion in model container [2021-11-23 16:48:17,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:48:17" (3/3) ... [2021-11-23 16:48:17,859 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_var_plus_ind2.c [2021-11-23 16:48:17,865 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:48:17,865 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:48:17,920 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:48:17,929 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:48:17,929 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:48:17,945 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.5) 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) [2021-11-23 16:48:17,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 16:48:17,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:17,952 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:17,953 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:17,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:17,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1818270042, now seen corresponding path program 1 times [2021-11-23 16:48:17,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:17,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1614446247] [2021-11-23 16:48:17,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:17,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:18,007 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:18,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:48:18,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:18,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:18,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:18,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:18,186 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:18,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1614446247] [2021-11-23 16:48:18,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1614446247] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:18,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:18,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:48:18,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340723169] [2021-11-23 16:48:18,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:18,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 16:48:18,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:18,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 16:48:18,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:48:18,233 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.5) 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) Second operand has 2 states, 2 states have (on average 3.5) 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) [2021-11-23 16:48:18,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:18,247 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2021-11-23 16:48:18,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 16:48:18,249 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) 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 [2021-11-23 16:48:18,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:18,259 INFO L225 Difference]: With dead ends: 27 [2021-11-23 16:48:18,259 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 16:48:18,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:48:18,267 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:18,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:48:18,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 16:48:18,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 16:48:18,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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) [2021-11-23 16:48:18,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-11-23 16:48:18,297 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2021-11-23 16:48:18,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:18,298 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-11-23 16:48:18,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) 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) [2021-11-23 16:48:18,298 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-11-23 16:48:18,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 16:48:18,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:18,299 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:18,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:18,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,511 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:18,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:18,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1808111311, now seen corresponding path program 1 times [2021-11-23 16:48:18,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:18,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1847708602] [2021-11-23 16:48:18,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:18,513 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:18,514 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:18,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:48:18,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:18,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:18,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:18,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:18,655 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:18,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1847708602] [2021-11-23 16:48:18,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1847708602] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:18,656 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:18,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:48:18,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998074087] [2021-11-23 16:48:18,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:18,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:18,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:18,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:18,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:18,660 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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) [2021-11-23 16:48:18,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:18,710 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-23 16:48:18,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:18,712 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 [2021-11-23 16:48:18,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:18,712 INFO L225 Difference]: With dead ends: 29 [2021-11-23 16:48:18,713 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 16:48:18,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:18,715 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 33 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:18,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 15 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:48:18,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 16:48:18,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2021-11-23 16:48:18,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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) [2021-11-23 16:48:18,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-23 16:48:18,723 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2021-11-23 16:48:18,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:18,724 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-23 16:48:18,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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) [2021-11-23 16:48:18,724 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-23 16:48:18,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 16:48:18,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:18,725 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:18,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:18,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,937 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:18,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:18,939 INFO L85 PathProgramCache]: Analyzing trace with hash 266504688, now seen corresponding path program 1 times [2021-11-23 16:48:18,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:18,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1506642351] [2021-11-23 16:48:18,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:18,940 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:18,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:18,941 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:18,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:48:18,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:18,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:19,055 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:19,055 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:19,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1506642351] [2021-11-23 16:48:19,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1506642351] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:19,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:19,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:48:19,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635764147] [2021-11-23 16:48:19,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:19,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:19,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:19,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:19,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:19,059 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-23 16:48:19,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:19,097 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-11-23 16:48:19,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:19,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 8 [2021-11-23 16:48:19,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:19,099 INFO L225 Difference]: With dead ends: 23 [2021-11-23 16:48:19,099 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 16:48:19,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:19,102 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:19,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 20 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:48:19,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 16:48:19,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-11-23 16:48:19,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 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) [2021-11-23 16:48:19,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-23 16:48:19,112 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-11-23 16:48:19,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:19,113 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-23 16:48:19,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-23 16:48:19,113 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-23 16:48:19,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 16:48:19,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:19,114 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:19,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:19,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:19,332 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:19,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:19,333 INFO L85 PathProgramCache]: Analyzing trace with hash 53732745, now seen corresponding path program 1 times [2021-11-23 16:48:19,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:19,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [406188853] [2021-11-23 16:48:19,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:19,335 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:19,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:19,336 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:48:19,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:19,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:19,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:19,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:19,545 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:19,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [406188853] [2021-11-23 16:48:19,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [406188853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:19,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1714707085] [2021-11-23 16:48:19,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:19,546 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:19,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:19,576 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 16:48:19,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:19,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:19,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:19,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:19,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1714707085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:19,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191666477] [2021-11-23 16:48:19,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:19,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:19,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:19,918 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 16:48:19,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:19,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:20,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:20,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:20,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:20,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191666477] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:20,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:20,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 7 [2021-11-23 16:48:20,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748396812] [2021-11-23 16:48:20,098 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:20,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:48:20,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:20,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:48:20,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:48:20,102 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-11-23 16:48:20,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:20,245 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-11-23 16:48:20,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:48:20,248 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 [2021-11-23 16:48:20,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:20,249 INFO L225 Difference]: With dead ends: 50 [2021-11-23 16:48:20,249 INFO L226 Difference]: Without dead ends: 43 [2021-11-23 16:48:20,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:48:20,251 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 132 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:20,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 35 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:48:20,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-23 16:48:20,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 22. [2021-11-23 16:48:20,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 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) [2021-11-23 16:48:20,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-23 16:48:20,263 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 10 [2021-11-23 16:48:20,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:20,264 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-23 16:48:20,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-11-23 16:48:20,264 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-23 16:48:20,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 16:48:20,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:20,265 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:20,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:20,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:20,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:20,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:20,878 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:20,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:20,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1715343990, now seen corresponding path program 1 times [2021-11-23 16:48:20,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:20,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [109525804] [2021-11-23 16:48:20,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:20,880 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:20,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:20,882 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:20,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:48:20,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:20,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:20,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:21,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:21,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,090 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:21,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [109525804] [2021-11-23 16:48:21,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [109525804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:21,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [431842286] [2021-11-23 16:48:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:21,091 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:21,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:21,092 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:21,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 16:48:21,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:21,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:21,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:21,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:21,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [431842286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:21,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028201964] [2021-11-23 16:48:21,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:21,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:21,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:21,264 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:21,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 16:48:21,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:21,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:48:21,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:21,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:21,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:21,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028201964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:21,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:21,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 16:48:21,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994406678] [2021-11-23 16:48:21,394 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:21,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:48:21,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:21,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:48:21,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:48:21,397 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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) [2021-11-23 16:48:21,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:21,469 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-11-23 16:48:21,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:48:21,470 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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 11 [2021-11-23 16:48:21,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:21,473 INFO L225 Difference]: With dead ends: 30 [2021-11-23 16:48:21,473 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 16:48:21,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:48:21,477 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:21,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 41 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:48:21,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 16:48:21,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 16:48:21,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2021-11-23 16:48:21,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-23 16:48:21,494 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 11 [2021-11-23 16:48:21,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:21,497 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-23 16:48:21,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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) [2021-11-23 16:48:21,498 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-23 16:48:21,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 16:48:21,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:21,499 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:21,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:21,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:21,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:22,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:22,121 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:22,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:22,122 INFO L85 PathProgramCache]: Analyzing trace with hash -334334928, now seen corresponding path program 2 times [2021-11-23 16:48:22,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:22,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [62336964] [2021-11-23 16:48:22,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:22,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:22,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:22,124 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:22,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:48:22,206 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:22,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:22,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:48:22,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:22,384 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 13 treesize of output 9 [2021-11-23 16:48:22,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:22,554 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:22,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:22,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:22,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:23,262 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:23,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:23,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [62336964] [2021-11-23 16:48:23,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [62336964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:23,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2131349822] [2021-11-23 16:48:23,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:23,264 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:23,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:23,272 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:23,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 16:48:23,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:23,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:23,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:48:23,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:23,497 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 13 treesize of output 9 [2021-11-23 16:48:23,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:23,616 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:23,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:23,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:23,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:23,892 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:23,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2131349822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:23,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511936200] [2021-11-23 16:48:23,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:23,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:23,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:23,893 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:23,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 16:48:23,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:23,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:23,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:48:23,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:24,063 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 13 treesize of output 9 [2021-11-23 16:48:24,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:24,153 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:24,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:24,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:24,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:24,438 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:24,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511936200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:24,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:24,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 8, 7, 8] total 13 [2021-11-23 16:48:24,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438322358] [2021-11-23 16:48:24,439 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:24,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 16:48:24,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:24,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 16:48:24,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-23 16:48:24,441 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 13 states, 13 states have (on average 2.0) 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) [2021-11-23 16:48:24,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:24,854 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2021-11-23 16:48:24,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:48:24,855 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) 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 14 [2021-11-23 16:48:24,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:24,856 INFO L225 Difference]: With dead ends: 37 [2021-11-23 16:48:24,857 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 16:48:24,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:48:24,858 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:24,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 85 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:48:24,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 16:48:24,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 25. [2021-11-23 16:48:24,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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) [2021-11-23 16:48:24,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-11-23 16:48:24,865 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 14 [2021-11-23 16:48:24,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:24,865 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-11-23 16:48:24,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) 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) [2021-11-23 16:48:24,866 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-11-23 16:48:24,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 16:48:24,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:24,867 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:24,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:25,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:25,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Ended with exit code 0 [2021-11-23 16:48:25,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:25,469 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:25,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:25,469 INFO L85 PathProgramCache]: Analyzing trace with hash -768933834, now seen corresponding path program 3 times [2021-11-23 16:48:25,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:25,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [597223625] [2021-11-23 16:48:25,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:25,470 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:25,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:25,470 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:25,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:48:25,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:25,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:25,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:48:25,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:25,673 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 15 treesize of output 11 [2021-11-23 16:48:25,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:25,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:48:25,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:25,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:26,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-23 16:48:26,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 248 treesize of output 240 [2021-11-23 16:48:27,426 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:27,426 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:27,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [597223625] [2021-11-23 16:48:27,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [597223625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:27,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [823974416] [2021-11-23 16:48:27,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:27,427 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:27,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:27,442 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:27,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 16:48:27,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:27,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:27,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:48:27,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:27,668 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 15 treesize of output 11 [2021-11-23 16:48:27,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:27,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:48:27,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:27,831 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:27,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:27,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-23 16:48:27,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 114 treesize of output 110 [2021-11-23 16:48:28,419 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:28,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [823974416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:28,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212859540] [2021-11-23 16:48:28,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:28,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:28,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:28,420 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:28,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 16:48:28,491 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:28,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:28,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:48:28,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:28,792 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 15 treesize of output 11 [2021-11-23 16:48:28,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:28,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:48:29,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:29,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:30,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-23 16:48:30,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 248 treesize of output 240 [2021-11-23 16:48:31,661 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:31,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212859540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:31,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:31,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 9, 10, 11, 12] total 35 [2021-11-23 16:48:31,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871144720] [2021-11-23 16:48:31,662 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:31,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 16:48:31,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:31,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 16:48:31,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=998, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 16:48:31,664 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 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) [2021-11-23 16:48:39,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:39,899 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2021-11-23 16:48:39,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 16:48:39,902 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 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 17 [2021-11-23 16:48:39,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:39,903 INFO L225 Difference]: With dead ends: 85 [2021-11-23 16:48:39,903 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 16:48:39,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 59 SyntacticMatches, 8 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=554, Invalid=2638, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:48:39,906 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 284 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:39,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 286 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 358 Invalid, 0 Unknown, 72 Unchecked, 0.7s Time] [2021-11-23 16:48:39,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 16:48:39,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 29. [2021-11-23 16:48:39,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 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) [2021-11-23 16:48:39,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-23 16:48:39,916 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 17 [2021-11-23 16:48:39,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:39,916 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-23 16:48:39,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 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) [2021-11-23 16:48:39,917 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-23 16:48:39,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 16:48:39,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:39,918 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:39,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:40,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:40,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-23 16:48:40,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:40,519 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:40,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:40,519 INFO L85 PathProgramCache]: Analyzing trace with hash 20881638, now seen corresponding path program 1 times [2021-11-23 16:48:40,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:40,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1341865065] [2021-11-23 16:48:40,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:40,520 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:40,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:40,521 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:40,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:48:40,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:40,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:48:40,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:40,661 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:40,771 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,771 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:40,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1341865065] [2021-11-23 16:48:40,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1341865065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:40,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1348753817] [2021-11-23 16:48:40,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:40,772 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:40,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:40,777 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:40,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 16:48:40,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:40,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:48:40,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:40,907 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:40,959 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:40,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1348753817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:40,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414858770] [2021-11-23 16:48:40,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:40,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:40,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:40,960 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:40,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 16:48:41,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:41,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:41,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:41,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:41,452 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:41,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414858770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:41,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:41,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 9] total 20 [2021-11-23 16:48:41,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416772643] [2021-11-23 16:48:41,453 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:41,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:48:41,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:41,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:48:41,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:48:41,455 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 20 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 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) [2021-11-23 16:48:41,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:41,710 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-11-23 16:48:41,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:48:41,711 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 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 18 [2021-11-23 16:48:41,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:41,712 INFO L225 Difference]: With dead ends: 51 [2021-11-23 16:48:41,712 INFO L226 Difference]: Without dead ends: 39 [2021-11-23 16:48:41,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2021-11-23 16:48:41,713 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 52 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:41,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 107 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:48:41,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-23 16:48:41,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2021-11-23 16:48:41,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 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) [2021-11-23 16:48:41,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-11-23 16:48:41,719 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 18 [2021-11-23 16:48:41,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:41,720 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-11-23 16:48:41,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.6) internal successors, (52), 20 states have internal predecessors, (52), 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) [2021-11-23 16:48:41,720 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-11-23 16:48:41,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 16:48:41,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:41,721 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:41,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:41,933 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-11-23 16:48:42,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:42,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:42,332 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:42,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:42,333 INFO L85 PathProgramCache]: Analyzing trace with hash -796542484, now seen corresponding path program 2 times [2021-11-23 16:48:42,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:42,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1239015781] [2021-11-23 16:48:42,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:42,333 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:42,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:42,335 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:42,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:48:42,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:42,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:42,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:48:42,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:42,552 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 13 treesize of output 9 [2021-11-23 16:48:42,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:42,794 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:42,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:43,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:43,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:44,345 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:44,346 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:44,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1239015781] [2021-11-23 16:48:44,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1239015781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:44,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1694476853] [2021-11-23 16:48:44,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:44,346 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:44,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:44,347 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:44,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 16:48:44,468 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:44,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:44,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:48:44,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:44,629 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 13 treesize of output 9 [2021-11-23 16:48:44,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:44,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:44,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:44,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:45,061 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:45,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1694476853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:45,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847885595] [2021-11-23 16:48:45,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:45,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:45,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:45,068 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:45,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 16:48:45,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:45,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:45,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 16:48:45,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:45,494 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 15 treesize of output 11 [2021-11-23 16:48:45,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:48:45,893 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:45,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:46,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:48:46,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:48:48,579 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:48,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847885595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:48,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:48,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 11, 14, 15] total 39 [2021-11-23 16:48:48,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101513005] [2021-11-23 16:48:48,580 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:48,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 16:48:48,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:48,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 16:48:48,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1288, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 16:48:48,583 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 39 states have internal predecessors, (71), 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) [2021-11-23 16:49:02,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:02,131 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2021-11-23 16:49:02,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 16:49:02,132 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 39 states have internal predecessors, (71), 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 21 [2021-11-23 16:49:02,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:02,133 INFO L225 Difference]: With dead ends: 95 [2021-11-23 16:49:02,133 INFO L226 Difference]: Without dead ends: 93 [2021-11-23 16:49:02,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1312 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=771, Invalid=4485, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 16:49:02,136 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 225 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:02,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 276 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 16:49:02,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-23 16:49:02,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 44. [2021-11-23 16:49:02,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 43 states have internal predecessors, (50), 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) [2021-11-23 16:49:02,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-11-23 16:49:02,148 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 21 [2021-11-23 16:49:02,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:02,148 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-11-23 16:49:02,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 39 states have internal predecessors, (71), 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) [2021-11-23 16:49:02,149 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-11-23 16:49:02,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 16:49:02,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:02,150 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:02,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:02,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:02,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:02,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:02,751 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:02,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:02,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1859381769, now seen corresponding path program 2 times [2021-11-23 16:49:02,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:02,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1472057842] [2021-11-23 16:49:02,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:49:02,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:02,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:02,754 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:02,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:49:02,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:49:02,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:02,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:49:02,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:02,984 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:02,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:03,354 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:03,354 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:03,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1472057842] [2021-11-23 16:49:03,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1472057842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:03,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1718684322] [2021-11-23 16:49:03,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:49:03,355 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:03,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:03,356 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:03,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 16:49:03,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:49:03,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:03,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:03,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:03,566 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:03,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:03,908 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:03,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1718684322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:03,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337964946] [2021-11-23 16:49:03,909 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:49:03,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:03,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:03,910 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:03,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 16:49:03,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:49:03,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:03,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:03,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:04,065 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:04,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:04,796 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:04,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337964946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:04,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:04,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8, 8, 8, 11] total 29 [2021-11-23 16:49:04,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112611629] [2021-11-23 16:49:04,797 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:04,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 16:49:04,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:04,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 16:49:04,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=671, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:49:04,798 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 30 states, 30 states have (on average 2.466666666666667) internal successors, (74), 29 states have internal predecessors, (74), 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) [2021-11-23 16:49:05,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:05,637 INFO L93 Difference]: Finished difference Result 143 states and 162 transitions. [2021-11-23 16:49:05,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 16:49:05,638 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.466666666666667) internal successors, (74), 29 states have internal predecessors, (74), 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 22 [2021-11-23 16:49:05,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:05,640 INFO L225 Difference]: With dead ends: 143 [2021-11-23 16:49:05,640 INFO L226 Difference]: Without dead ends: 129 [2021-11-23 16:49:05,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=354, Invalid=978, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 16:49:05,642 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 837 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 837 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:05,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [837 Valid, 261 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 16:49:05,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-23 16:49:05,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 64. [2021-11-23 16:49:05,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.1904761904761905) internal successors, (75), 63 states have internal predecessors, (75), 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) [2021-11-23 16:49:05,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 75 transitions. [2021-11-23 16:49:05,654 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 75 transitions. Word has length 22 [2021-11-23 16:49:05,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:05,655 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 75 transitions. [2021-11-23 16:49:05,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.466666666666667) internal successors, (74), 29 states have internal predecessors, (74), 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) [2021-11-23 16:49:05,655 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 75 transitions. [2021-11-23 16:49:05,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 16:49:05,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:05,657 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:05,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:05,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:06,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-23 16:49:06,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:06,260 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:06,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:06,261 INFO L85 PathProgramCache]: Analyzing trace with hash 1855888886, now seen corresponding path program 4 times [2021-11-23 16:49:06,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:06,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1198789783] [2021-11-23 16:49:06,261 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:06,261 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:06,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:06,262 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:06,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 16:49:06,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:06,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:06,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:06,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:06,440 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 15 treesize of output 11 [2021-11-23 16:49:06,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:06,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:06,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:06,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:06,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:06,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:49:06,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:06,898 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:06,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:08,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 53 [2021-11-23 16:49:08,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5352 treesize of output 5320 [2021-11-23 16:49:15,383 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:15,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:15,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1198789783] [2021-11-23 16:49:15,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1198789783] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:15,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [921114093] [2021-11-23 16:49:15,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:15,384 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:15,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:15,384 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:15,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 16:49:15,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:15,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:15,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:15,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:15,568 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 15 treesize of output 11 [2021-11-23 16:49:15,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:15,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:15,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:15,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:15,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:15,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:49:15,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:15,771 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:15,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:16,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 53 [2021-11-23 16:49:16,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2672 treesize of output 2656 [2021-11-23 16:49:18,116 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:18,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [921114093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:18,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161877375] [2021-11-23 16:49:18,117 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:18,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:18,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:18,118 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:18,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 16:49:18,178 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:18,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:18,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:49:18,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:18,529 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 15 treesize of output 11 [2021-11-23 16:49:18,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:18,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 16:49:18,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:18,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-23 16:49:19,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:19,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:19,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:19,483 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:19,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:22,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 53 [2021-11-23 16:49:22,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2672 treesize of output 2656 [2021-11-23 16:49:25,487 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:25,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161877375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:25,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:25,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13, 14, 15, 16] total 51 [2021-11-23 16:49:25,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104644332] [2021-11-23 16:49:25,488 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:25,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 16:49:25,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:25,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 16:49:25,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2130, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 16:49:25,491 INFO L87 Difference]: Start difference. First operand 64 states and 75 transitions. Second operand has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 51 states have internal predecessors, (85), 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) [2021-11-23 16:49:36,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:36,626 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2021-11-23 16:49:36,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 16:49:36,629 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 51 states have internal predecessors, (85), 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 23 [2021-11-23 16:49:36,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:36,631 INFO L225 Difference]: With dead ends: 124 [2021-11-23 16:49:36,631 INFO L226 Difference]: Without dead ends: 122 [2021-11-23 16:49:36,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1591 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=1002, Invalid=5004, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 16:49:36,634 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 323 mSDsluCounter, 556 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 349 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:36,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [323 Valid, 579 Invalid, 1012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 582 Invalid, 0 Unknown, 349 Unchecked, 1.0s Time] [2021-11-23 16:49:36,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-23 16:49:36,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 65. [2021-11-23 16:49:36,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.1875) internal successors, (76), 64 states have internal predecessors, (76), 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) [2021-11-23 16:49:36,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 76 transitions. [2021-11-23 16:49:36,648 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 76 transitions. Word has length 23 [2021-11-23 16:49:36,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:36,649 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 76 transitions. [2021-11-23 16:49:36,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 51 states have internal predecessors, (85), 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) [2021-11-23 16:49:36,650 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 76 transitions. [2021-11-23 16:49:36,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 16:49:36,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:36,651 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:36,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:36,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:37,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:37,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:37,253 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:37,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:37,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1256237218, now seen corresponding path program 3 times [2021-11-23 16:49:37,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:37,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1602723676] [2021-11-23 16:49:37,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:49:37,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:37,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:37,255 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:37,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:49:37,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:49:37,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:37,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:37,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:37,527 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:37,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:37,867 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:37,867 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:37,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1602723676] [2021-11-23 16:49:37,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1602723676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:37,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1129811105] [2021-11-23 16:49:37,868 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:49:37,868 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:37,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:37,869 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:37,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 16:49:38,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:49:38,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:38,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:38,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:38,112 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:38,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:38,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1129811105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:38,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133935796] [2021-11-23 16:49:38,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:49:38,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:38,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:38,248 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:38,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 16:49:38,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:49:38,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:38,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:38,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:38,413 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:38,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:38,533 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:38,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133935796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:38,533 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:38,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 11, 10, 11] total 20 [2021-11-23 16:49:38,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469229320] [2021-11-23 16:49:38,534 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:38,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:49:38,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:38,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:49:38,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:49:38,535 INFO L87 Difference]: Start difference. First operand 65 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 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) [2021-11-23 16:49:38,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:38,868 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2021-11-23 16:49:38,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:49:38,869 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 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 25 [2021-11-23 16:49:38,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:38,871 INFO L225 Difference]: With dead ends: 82 [2021-11-23 16:49:38,871 INFO L226 Difference]: Without dead ends: 61 [2021-11-23 16:49:38,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=120, Invalid=432, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:49:38,873 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 87 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:38,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 144 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:49:38,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-23 16:49:38,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 54. [2021-11-23 16:49:38,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 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) [2021-11-23 16:49:38,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-11-23 16:49:38,883 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 25 [2021-11-23 16:49:38,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:38,884 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-11-23 16:49:38,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 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) [2021-11-23 16:49:38,884 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-11-23 16:49:38,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 16:49:38,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:38,885 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:38,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:39,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:39,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:39,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:39,497 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:39,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:39,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1435207764, now seen corresponding path program 4 times [2021-11-23 16:49:39,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:39,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [318935430] [2021-11-23 16:49:39,498 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:39,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:39,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:39,499 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:39,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 16:49:39,567 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:39,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:39,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:39,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:39,720 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 17 treesize of output 13 [2021-11-23 16:49:39,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:39,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:39,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:39,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:49:40,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:40,137 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:40,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:41,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:49:41,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 584 treesize of output 576 [2021-11-23 16:49:47,557 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:47,557 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:47,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [318935430] [2021-11-23 16:49:47,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [318935430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:47,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [596076827] [2021-11-23 16:49:47,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:47,558 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:47,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:47,559 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:47,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 16:49:47,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:47,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:47,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:47,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:47,892 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 17 treesize of output 13 [2021-11-23 16:49:47,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:47,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:48,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:48,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:49:48,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:48,164 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:48,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:48,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:49:48,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1200 treesize of output 1184 [2021-11-23 16:49:54,301 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:54,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [596076827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:54,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81641396] [2021-11-23 16:49:54,302 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:54,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:54,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:54,303 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:54,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 16:49:54,363 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:54,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:54,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:49:54,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:54,775 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 17 treesize of output 13 [2021-11-23 16:49:54,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:54,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:55,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:55,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:49:55,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:49:55,600 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:55,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:58,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:49:58,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 282 treesize of output 278 [2021-11-23 16:50:02,331 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:02,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81641396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:02,332 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:02,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14, 15, 18, 19] total 55 [2021-11-23 16:50:02,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224640718] [2021-11-23 16:50:02,333 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:02,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 16:50:02,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:02,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 16:50:02,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2612, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:50:02,336 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 55 states, 55 states have (on average 1.7272727272727273) internal successors, (95), 55 states have internal predecessors, (95), 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) [2021-11-23 16:50:06,253 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:16,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:16,869 INFO L93 Difference]: Finished difference Result 118 states and 129 transitions. [2021-11-23 16:50:16,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 16:50:16,872 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.7272727272727273) internal successors, (95), 55 states have internal predecessors, (95), 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 27 [2021-11-23 16:50:16,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:16,873 INFO L225 Difference]: With dead ends: 118 [2021-11-23 16:50:16,873 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 16:50:16,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 101 SyntacticMatches, 7 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1739 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=878, Invalid=5928, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 16:50:16,876 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 347 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 749 mSolverCounterSat, 131 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 749 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 288 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:16,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [347 Valid, 582 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 749 Invalid, 1 Unknown, 288 Unchecked, 3.4s Time] [2021-11-23 16:50:16,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 16:50:16,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 54. [2021-11-23 16:50:16,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 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) [2021-11-23 16:50:16,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-11-23 16:50:16,888 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 27 [2021-11-23 16:50:16,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:16,889 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-11-23 16:50:16,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.7272727272727273) internal successors, (95), 55 states have internal predecessors, (95), 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) [2021-11-23 16:50:16,889 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-11-23 16:50:16,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 16:50:16,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:16,891 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:16,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:17,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:17,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:17,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:17,501 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:17,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:17,501 INFO L85 PathProgramCache]: Analyzing trace with hash 2053274844, now seen corresponding path program 5 times [2021-11-23 16:50:17,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:17,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1793651110] [2021-11-23 16:50:17,502 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:50:17,502 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:17,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:17,502 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:17,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 16:50:17,588 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:50:17,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:50:17,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:50:17,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:17,862 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 13 treesize of output 9 [2021-11-23 16:50:18,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:50:18,221 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:18,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:18,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:50:18,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:50:20,607 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:20,608 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:20,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1793651110] [2021-11-23 16:50:20,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1793651110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:20,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [995686223] [2021-11-23 16:50:20,608 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:50:20,608 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:20,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:20,609 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:20,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 16:50:20,758 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:50:20,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:50:20,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:50:20,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:20,920 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 13 treesize of output 9 [2021-11-23 16:50:21,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:50:21,162 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:21,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:21,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:50:21,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:50:21,759 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:21,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [995686223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:21,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690313843] [2021-11-23 16:50:21,760 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:50:21,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:21,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:21,761 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:21,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 16:50:21,894 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:50:21,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:50:21,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:50:21,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:22,238 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 17 treesize of output 13 [2021-11-23 16:50:22,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:22,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:50:23,335 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 16:50:23,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 26 [2021-11-23 16:50:23,348 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:23,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:24,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 45 [2021-11-23 16:50:24,465 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 16:50:24,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 934 treesize of output 870 [2021-11-23 16:50:29,518 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:29,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690313843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:29,519 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:29,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14, 15, 15, 16] total 49 [2021-11-23 16:50:29,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643086574] [2021-11-23 16:50:29,519 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:29,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 16:50:29,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:29,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 16:50:29,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2182, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 16:50:29,522 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 49 states have internal predecessors, (104), 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) [2021-11-23 16:50:36,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:36,881 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2021-11-23 16:50:36,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:50:36,882 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 49 states have internal predecessors, (104), 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 28 [2021-11-23 16:50:36,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:36,883 INFO L225 Difference]: With dead ends: 98 [2021-11-23 16:50:36,884 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 16:50:36,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 110 SyntacticMatches, 5 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1090 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=424, Invalid=4546, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 16:50:36,886 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 125 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:36,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 270 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 571 Invalid, 0 Unknown, 150 Unchecked, 1.6s Time] [2021-11-23 16:50:36,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 16:50:36,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 59. [2021-11-23 16:50:36,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 58 states have internal predecessors, (68), 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) [2021-11-23 16:50:36,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-11-23 16:50:36,897 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 28 [2021-11-23 16:50:36,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:36,898 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-11-23 16:50:36,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 49 states have internal predecessors, (104), 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) [2021-11-23 16:50:36,898 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-11-23 16:50:36,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 16:50:36,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:36,900 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:36,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:37,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:37,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 16:50:37,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:37,513 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:37,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:37,513 INFO L85 PathProgramCache]: Analyzing trace with hash 1640133522, now seen corresponding path program 6 times [2021-11-23 16:50:37,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:37,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1986641908] [2021-11-23 16:50:37,513 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:50:37,514 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:37,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:37,515 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:37,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 16:50:37,612 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:50:37,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:50:37,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:37,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:37,884 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 3 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:37,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:38,375 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:38,375 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:38,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1986641908] [2021-11-23 16:50:38,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1986641908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:38,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [15814504] [2021-11-23 16:50:38,376 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:50:38,376 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:38,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:38,377 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:38,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 16:50:38,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 1 [2021-11-23 16:50:38,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 16:50:38,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892990216] [2021-11-23 16:50:38,514 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:50:38,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:38,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:38,515 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:38,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 16:50:38,680 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:50:38,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:50:38,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:38,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:38,868 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 3 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:38,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:39,093 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:39,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892990216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:39,093 INFO L186 FreeRefinementEngine]: Found 0 perfect and 4 imperfect interpolant sequences. [2021-11-23 16:50:39,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12, 13] total 24 [2021-11-23 16:50:39,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583129327] [2021-11-23 16:50:39,094 INFO L85 oduleStraightlineAll]: Using 4 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:39,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 16:50:39,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:39,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 16:50:39,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:50:39,096 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 24 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 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) [2021-11-23 16:50:39,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:39,761 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2021-11-23 16:50:39,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:50:39,762 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 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 32 [2021-11-23 16:50:39,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:39,763 INFO L225 Difference]: With dead ends: 86 [2021-11-23 16:50:39,763 INFO L226 Difference]: Without dead ends: 66 [2021-11-23 16:50:39,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=157, Invalid=655, Unknown=0, NotChecked=0, Total=812 [2021-11-23 16:50:39,765 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 121 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:39,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 156 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 16:50:39,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-23 16:50:39,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 59. [2021-11-23 16:50:39,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 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) [2021-11-23 16:50:39,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-23 16:50:39,779 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 32 [2021-11-23 16:50:39,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:39,779 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-23 16:50:39,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 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) [2021-11-23 16:50:39,780 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-23 16:50:39,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 16:50:39,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:39,782 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:39,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:40,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:40,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:40,188 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:40,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:40,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1605814044, now seen corresponding path program 7 times [2021-11-23 16:50:40,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:40,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1746054857] [2021-11-23 16:50:40,189 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:50:40,189 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:40,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:40,190 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:40,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 16:50:40,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:40,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:50:40,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:40,627 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 19 treesize of output 15 [2021-11-23 16:50:40,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:40,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 16:50:40,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:40,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:50:41,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:50:41,470 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:41,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:42,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:50:42,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 282 treesize of output 278 [2021-11-23 16:50:47,328 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:47,329 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:47,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1746054857] [2021-11-23 16:50:47,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1746054857] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:47,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [538742199] [2021-11-23 16:50:47,329 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:50:47,329 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:47,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:47,330 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:47,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 16:50:47,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:47,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:50:47,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:47,656 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 19 treesize of output 15 [2021-11-23 16:50:47,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:47,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 16:50:47,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:47,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:50:47,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:50:47,945 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:47,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:48,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:50:48,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 590 treesize of output 582 [2021-11-23 16:50:52,813 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:52,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [538742199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:52,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012020173] [2021-11-23 16:50:52,814 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:50:52,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:52,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:52,814 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:52,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 16:50:52,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:52,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:50:52,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:53,064 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 19 treesize of output 15 [2021-11-23 16:50:53,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:53,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 16:50:53,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:53,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:50:53,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:50:53,499 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:53,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:54,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 41 [2021-11-23 16:50:54,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1192 treesize of output 1176 [2021-11-23 16:50:58,399 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:58,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012020173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:58,400 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:58,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 17, 18, 18, 19] total 35 [2021-11-23 16:50:58,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983930104] [2021-11-23 16:50:58,400 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:58,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 16:50:58,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:58,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 16:50:58,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 16:50:58,402 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 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) [2021-11-23 16:51:04,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:04,004 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2021-11-23 16:51:04,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 16:51:04,005 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 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 34 [2021-11-23 16:51:04,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:04,007 INFO L225 Difference]: With dead ends: 106 [2021-11-23 16:51:04,007 INFO L226 Difference]: Without dead ends: 104 [2021-11-23 16:51:04,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 150 SyntacticMatches, 15 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=342, Invalid=3318, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 16:51:04,010 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 82 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:04,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 328 Invalid, 700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 509 Invalid, 0 Unknown, 145 Unchecked, 1.4s Time] [2021-11-23 16:51:04,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-23 16:51:04,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 58. [2021-11-23 16:51:04,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 57 states have internal predecessors, (66), 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) [2021-11-23 16:51:04,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-11-23 16:51:04,026 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 34 [2021-11-23 16:51:04,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:04,027 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-11-23 16:51:04,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 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) [2021-11-23 16:51:04,027 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-11-23 16:51:04,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 16:51:04,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:04,028 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:04,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:04,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:04,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:04,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:04,653 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:04,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:04,653 INFO L85 PathProgramCache]: Analyzing trace with hash -246527464, now seen corresponding path program 8 times [2021-11-23 16:51:04,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:04,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1395712869] [2021-11-23 16:51:04,653 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:51:04,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:04,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:04,654 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:04,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 16:51:04,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:51:04,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:51:04,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:51:04,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:05,195 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 13 treesize of output 9 [2021-11-23 16:51:05,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:51:05,653 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:05,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:06,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:51:06,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:51:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:09,811 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1395712869] [2021-11-23 16:51:09,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1395712869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [94964799] [2021-11-23 16:51:09,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:51:09,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:09,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:09,812 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:09,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 16:51:09,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:51:09,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:51:09,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:51:09,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:10,220 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 13 treesize of output 9 [2021-11-23 16:51:10,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:51:10,443 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:10,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:10,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:51:10,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:51:11,247 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:11,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [94964799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:11,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565546914] [2021-11-23 16:51:11,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:51:11,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:11,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:11,249 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:11,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 16:51:11,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:51:11,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:51:11,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:51:11,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:12,250 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 17 treesize of output 13 [2021-11-23 16:51:12,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:51:12,969 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:12,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:14,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 16:51:14,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2021-11-23 16:51:20,022 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:20,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565546914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:20,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:20,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16, 17, 20, 21] total 59 [2021-11-23 16:51:20,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306702806] [2021-11-23 16:51:20,023 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:20,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-23 16:51:20,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:20,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-23 16:51:20,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=3132, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 16:51:20,026 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 59 states, 59 states have (on average 1.88135593220339) internal successors, (111), 59 states have internal predecessors, (111), 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) [2021-11-23 16:51:33,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:33,085 INFO L93 Difference]: Finished difference Result 140 states and 150 transitions. [2021-11-23 16:51:33,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 16:51:33,086 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.88135593220339) internal successors, (111), 59 states have internal predecessors, (111), 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 35 [2021-11-23 16:51:33,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:33,087 INFO L225 Difference]: With dead ends: 140 [2021-11-23 16:51:33,087 INFO L226 Difference]: Without dead ends: 138 [2021-11-23 16:51:33,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2462 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=967, Invalid=9133, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 16:51:33,092 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 283 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 840 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 988 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:33,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [283 Valid, 525 Invalid, 988 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 840 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 16:51:33,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-23 16:51:33,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 90. [2021-11-23 16:51:33,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.1348314606741574) internal successors, (101), 89 states have internal predecessors, (101), 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) [2021-11-23 16:51:33,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 101 transitions. [2021-11-23 16:51:33,122 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 101 transitions. Word has length 35 [2021-11-23 16:51:33,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:33,122 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 101 transitions. [2021-11-23 16:51:33,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.88135593220339) internal successors, (111), 59 states have internal predecessors, (111), 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) [2021-11-23 16:51:33,123 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 101 transitions. [2021-11-23 16:51:33,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 16:51:33,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:33,124 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:33,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:33,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:33,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 16:51:33,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,726 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:33,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:33,726 INFO L85 PathProgramCache]: Analyzing trace with hash 1292495222, now seen corresponding path program 5 times [2021-11-23 16:51:33,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:33,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [621093677] [2021-11-23 16:51:33,727 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:51:33,727 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:33,728 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:33,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27808d2c-93fe-4586-bdf3-3a7c3b62d6ed/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 16:51:33,877 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-23 16:51:33,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:51:33,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 16:51:33,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:33,989 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 15 treesize of output 11 [2021-11-23 16:51:34,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 16:51:34,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:51:34,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 16:51:35,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2021-11-23 16:51:35,093 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:35,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:43,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 101 [2021-11-23 16:51:44,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15672335663080 treesize of output 15668040695784