./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/down.i --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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/down.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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 d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:34:49,623 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:34:49,625 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:34:49,660 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:34:49,661 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:34:49,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:34:49,664 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:34:49,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:34:49,670 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:34:49,672 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:34:49,673 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:34:49,675 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:34:49,676 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:34:49,677 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:34:49,679 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:34:49,681 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:34:49,683 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:34:49,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:34:49,687 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:34:49,689 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:34:49,692 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:34:49,693 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:34:49,695 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:34:49,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:34:49,701 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:34:49,702 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:34:49,702 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:34:49,703 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:34:49,704 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:34:49,706 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:34:49,706 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:34:49,707 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:34:49,708 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:34:49,710 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:34:49,711 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:34:49,711 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:34:49,713 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:34:49,713 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:34:49,713 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:34:49,715 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:34:49,716 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:34:49,717 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:34:49,768 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:34:49,769 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:34:49,769 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:34:49,770 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:34:49,771 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:34:49,771 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:34:49,771 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:34:49,771 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:34:49,771 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:34:49,771 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:34:49,772 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:34:49,773 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:34:49,773 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:34:49,773 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:34:49,773 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:34:49,774 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:34:49,774 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:34:49,774 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:34:49,775 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:34:49,775 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:34:49,775 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:34:49,775 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:34:49,775 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:34:49,776 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:34:49,776 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:34:49,776 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:34:49,777 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:34:49,777 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:34:49,778 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:34:49,778 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:34:49,784 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:34:49,785 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:34:49,785 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:49,785 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:34:49,785 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:34:49,786 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:34:49,787 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 [2021-11-23 17:34:50,027 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:34:50,049 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:34:50,052 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:34:50,053 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:34:50,054 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:34:50,055 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loop-invgen/down.i [2021-11-23 17:34:50,130 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/98e82b161/7aafbe8c9d67410ba5beb0ac20eb548c/FLAGc023550e9 [2021-11-23 17:34:50,585 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:34:50,586 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i [2021-11-23 17:34:50,591 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/98e82b161/7aafbe8c9d67410ba5beb0ac20eb548c/FLAGc023550e9 [2021-11-23 17:34:50,992 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/98e82b161/7aafbe8c9d67410ba5beb0ac20eb548c [2021-11-23 17:34:50,994 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:34:50,996 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:34:50,997 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:50,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:34:51,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:34:51,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:50" (1/1) ... [2021-11-23 17:34:51,003 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@795fc816 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51, skipping insertion in model container [2021-11-23 17:34:51,003 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:50" (1/1) ... [2021-11-23 17:34:51,011 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:34:51,052 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:34:51,213 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-23 17:34:51,224 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:51,233 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:34:51,257 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-23 17:34:51,264 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:51,281 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:34:51,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51 WrapperNode [2021-11-23 17:34:51,281 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:51,282 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:51,282 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:34:51,282 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:34:51,289 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,296 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,315 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 45 [2021-11-23 17:34:51,316 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:51,318 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:34:51,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:34:51,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:34:51,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,333 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,334 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,347 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,351 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:34:51,356 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:34:51,356 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:34:51,356 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:34:51,357 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:51" (1/1) ... [2021-11-23 17:34:51,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:51,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:51,398 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:34:51,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:34:51,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:34:51,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:34:51,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:34:51,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:34:51,533 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:34:51,536 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:34:51,696 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:34:51,711 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 17:34:51,717 INFO L158 Benchmark]: Toolchain (without parser) took 719.41ms. Allocated memory is still 100.7MB. Free memory was 76.9MB in the beginning and 59.1MB in the end (delta: 17.8MB). Peak memory consumption was 15.0MB. Max. memory is 16.1GB. [2021-11-23 17:34:51,719 INFO L158 Benchmark]: CDTParser took 0.21ms. Allocated memory is still 83.9MB. Free memory was 57.5MB in the beginning and 57.4MB in the end (delta: 40.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:34:51,721 INFO L158 Benchmark]: CACSL2BoogieTranslator took 284.37ms. Allocated memory is still 100.7MB. Free memory was 76.7MB in the beginning and 70.6MB in the end (delta: 6.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:34:51,723 INFO L158 Benchmark]: Boogie Procedure Inliner took 35.30ms. Allocated memory is still 100.7MB. Free memory was 70.6MB in the beginning and 69.1MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:34:51,724 INFO L158 Benchmark]: Boogie Preprocessor took 36.44ms. Allocated memory is still 100.7MB. Free memory was 69.1MB in the beginning and 68.1MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:34:51,725 INFO L158 Benchmark]: RCFGBuilder took 358.74ms. Allocated memory is still 100.7MB. Free memory was 68.1MB in the beginning and 59.1MB in the end (delta: 9.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:34:51,730 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21ms. Allocated memory is still 83.9MB. Free memory was 57.5MB in the beginning and 57.4MB in the end (delta: 40.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 284.37ms. Allocated memory is still 100.7MB. Free memory was 76.7MB in the beginning and 70.6MB in the end (delta: 6.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 35.30ms. Allocated memory is still 100.7MB. Free memory was 70.6MB in the beginning and 69.1MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 36.44ms. Allocated memory is still 100.7MB. Free memory was 69.1MB in the beginning and 68.1MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 358.74ms. Allocated memory is still 100.7MB. Free memory was 68.1MB in the beginning and 59.1MB in the end (delta: 9.0MB). Peak memory consumption was 8.4MB. 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 17:34:51,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/down.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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 d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:34:54,354 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:34:54,357 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:34:54,409 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:34:54,410 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:34:54,415 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:34:54,417 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:34:54,425 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:34:54,428 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:34:54,436 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:34:54,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:34:54,440 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:34:54,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:34:54,444 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:34:54,446 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:34:54,451 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:34:54,453 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:34:54,454 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:34:54,463 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:34:54,473 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:34:54,475 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:34:54,477 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:34:54,481 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:34:54,483 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:34:54,493 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:34:54,493 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:34:54,494 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:34:54,496 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:34:54,497 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:34:54,498 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:34:54,499 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:34:54,500 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:34:54,502 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:34:54,503 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:34:54,505 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:34:54,505 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:34:54,506 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:34:54,507 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:34:54,507 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:34:54,509 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:34:54,510 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:34:54,511 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:34:54,562 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:34:54,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:34:54,563 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:34:54,564 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:34:54,565 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:34:54,565 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:34:54,566 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:34:54,566 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:34:54,566 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:34:54,566 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:34:54,568 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:34:54,568 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:34:54,570 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:34:54,570 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:34:54,571 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:34:54,571 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:34:54,571 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:34:54,572 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:34:54,572 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:34:54,572 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:34:54,572 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:34:54,573 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:34:54,573 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:34:54,573 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:34:54,574 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:34:54,574 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:34:54,574 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:34:54,575 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:34:54,575 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:34:54,575 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:54,575 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:34:54,576 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:34:54,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:34:54,577 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:34:54,577 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:54,578 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:34:54,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:34:54,579 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:34:54,579 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 [2021-11-23 17:34:54,973 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:34:55,004 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:34:55,008 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:34:55,009 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:34:55,009 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:34:55,011 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loop-invgen/down.i [2021-11-23 17:34:55,091 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/2984bab6f/86abfbdb47494ca3839c79ec1800a4a2/FLAGf7959da08 [2021-11-23 17:34:55,658 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:34:55,659 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i [2021-11-23 17:34:55,665 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/2984bab6f/86abfbdb47494ca3839c79ec1800a4a2/FLAGf7959da08 [2021-11-23 17:34:56,061 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/data/2984bab6f/86abfbdb47494ca3839c79ec1800a4a2 [2021-11-23 17:34:56,073 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:34:56,075 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:34:56,079 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:56,079 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:34:56,083 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:34:56,085 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,087 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6dd914e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56, skipping insertion in model container [2021-11-23 17:34:56,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:34:56,112 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:34:56,313 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-23 17:34:56,323 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:56,334 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:34:56,348 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_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-23 17:34:56,352 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:56,367 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:34:56,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56 WrapperNode [2021-11-23 17:34:56,368 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:56,369 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:56,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:34:56,370 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:34:56,378 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,408 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-23 17:34:56,408 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:56,409 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:34:56,410 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:34:56,410 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:34:56,419 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,419 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,421 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,427 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,431 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,432 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,434 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:34:56,436 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:34:56,436 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:34:56,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:34:56,437 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (1/1) ... [2021-11-23 17:34:56,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:56,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:56,468 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:34:56,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:34:56,517 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:34:56,518 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:34:56,518 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:34:56,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:34:56,600 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:34:56,602 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:34:56,741 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:34:56,748 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:34:56,748 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:34:56,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:34:56 BoogieIcfgContainer [2021-11-23 17:34:56,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:34:56,753 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:34:56,753 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:34:56,756 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:34:56,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:34:56" (1/3) ... [2021-11-23 17:34:56,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c569e16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:34:56, skipping insertion in model container [2021-11-23 17:34:56,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:56" (2/3) ... [2021-11-23 17:34:56,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c569e16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:34:56, skipping insertion in model container [2021-11-23 17:34:56,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:34:56" (3/3) ... [2021-11-23 17:34:56,760 INFO L111 eAbstractionObserver]: Analyzing ICFG down.i [2021-11-23 17:34:56,765 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:34:56,766 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:34:56,836 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:34:56,843 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 17:34:56,852 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:34:56,879 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:56,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 17:34:56,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:56,885 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:56,886 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:56,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:56,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1808851121, now seen corresponding path program 1 times [2021-11-23 17:34:56,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:56,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1428661288] [2021-11-23 17:34:56,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:56,925 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:56,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:56,929 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:56,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:34:56,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:56,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:57,130 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 17:34:57,131 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:57,132 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:57,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1428661288] [2021-11-23 17:34:57,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1428661288] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:57,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:57,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:34:57,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238621100] [2021-11-23 17:34:57,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:57,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:34:57,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:57,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:34:57,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:34:57,179 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 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 17:34:57,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:57,258 INFO L93 Difference]: Finished difference Result 30 states and 39 transitions. [2021-11-23 17:34:57,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:34:57,260 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 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 17:34:57,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:57,272 INFO L225 Difference]: With dead ends: 30 [2021-11-23 17:34:57,273 INFO L226 Difference]: Without dead ends: 10 [2021-11-23 17:34:57,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:34:57,283 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:57,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 35 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:34:57,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-23 17:34:57,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-23 17:34:57,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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 17:34:57,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-23 17:34:57,309 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-23 17:34:57,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:57,309 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-23 17:34:57,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 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 17:34:57,309 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-23 17:34:57,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 17:34:57,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:57,310 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:57,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:57,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:57,516 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:57,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:57,520 INFO L85 PathProgramCache]: Analyzing trace with hash 291256044, now seen corresponding path program 1 times [2021-11-23 17:34:57,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:57,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [466505410] [2021-11-23 17:34:57,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,522 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:57,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:57,524 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:34:57,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:57,621 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 17:34:57,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:57,685 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 17:34:57,685 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:57,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [466505410] [2021-11-23 17:34:57,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [466505410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:57,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [964268162] [2021-11-23 17:34:57,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,686 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:57,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:57,693 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (4)] Waiting until timeout for monitored process [2021-11-23 17:34:57,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:57,832 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 17:34:57,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:57,886 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 17:34:57,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [964268162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:57,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042787490] [2021-11-23 17:34:57,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:57,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:57,890 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 17:34:57,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:57,998 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 17:34:57,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:58,036 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 17:34:58,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042787490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:58,037 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:58,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 17:34:58,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434458252] [2021-11-23 17:34:58,039 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:58,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 17:34:58,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:58,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 17:34:58,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:34:58,043 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 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 17:34:58,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:58,280 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-11-23 17:34:58,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:34:58,281 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 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) Word has length 8 [2021-11-23 17:34:58,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:58,282 INFO L225 Difference]: With dead ends: 38 [2021-11-23 17:34:58,283 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 17:34:58,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:34:58,285 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:58,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 29 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:34:58,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 17:34:58,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 16. [2021-11-23 17:34:58,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:58,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-23 17:34:58,297 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 8 [2021-11-23 17:34:58,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:58,298 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-23 17:34:58,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 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 17:34:58,302 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-23 17:34:58,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 17:34:58,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:58,303 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:58,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:58,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:58,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:58,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:58,921 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:58,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:58,922 INFO L85 PathProgramCache]: Analyzing trace with hash 979689165, now seen corresponding path program 1 times [2021-11-23 17:34:58,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:58,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [967246524] [2021-11-23 17:34:58,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:58,923 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:58,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:58,924 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:58,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:34:58,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:58,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:34:58,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:59,167 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:59,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:59,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [967246524] [2021-11-23 17:34:59,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [967246524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:59,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [692342918] [2021-11-23 17:34:59,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:59,500 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:59,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:59,508 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:59,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 17:34:59,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:59,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:34:59,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:59,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:59,739 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [692342918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:59,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794763142] [2021-11-23 17:34:59,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:59,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:59,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:59,741 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:59,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 17:34:59,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:59,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:34:59,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:59,885 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:00,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:00,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794763142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:00,195 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:00,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 8] total 15 [2021-11-23 17:35:00,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020559426] [2021-11-23 17:35:00,196 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:00,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 17:35:00,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:00,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 17:35:00,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:35:00,199 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 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 17:35:00,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:00,393 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-23 17:35:00,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:35:00,394 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 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 17:35:00,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:00,395 INFO L225 Difference]: With dead ends: 26 [2021-11-23 17:35:00,395 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 17:35:00,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:35:00,397 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:00,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 8 Unchecked, 0.1s Time] [2021-11-23 17:35:00,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 17:35:00,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-23 17:35:00,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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 17:35:00,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-23 17:35:00,402 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2021-11-23 17:35:00,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:00,402 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-23 17:35:00,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 states have internal predecessors, (23), 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 17:35:00,403 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-23 17:35:00,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 17:35:00,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:00,403 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:00,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:00,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:00,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:35:01,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:01,009 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:01,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:01,010 INFO L85 PathProgramCache]: Analyzing trace with hash 521279345, now seen corresponding path program 2 times [2021-11-23 17:35:01,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:01,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1149567010] [2021-11-23 17:35:01,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:01,011 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:01,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:01,018 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:01,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:35:01,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:01,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:01,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:01,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:01,306 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:01,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1149567010] [2021-11-23 17:35:01,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1149567010] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:01,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1946828776] [2021-11-23 17:35:01,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:01,307 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:01,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:01,312 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:01,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 17:35:01,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:01,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:01,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:01,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:01,442 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:01,481 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1946828776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:01,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221669439] [2021-11-23 17:35:01,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:01,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:01,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:01,488 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:01,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 17:35:01,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:01,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:01,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:01,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:01,587 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:01,623 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:01,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221669439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:01,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:01,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 14 [2021-11-23 17:35:01,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159337759] [2021-11-23 17:35:01,625 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:01,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 17:35:01,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:01,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 17:35:01,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:35:01,628 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:03,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:03,252 INFO L93 Difference]: Finished difference Result 116 states and 133 transitions. [2021-11-23 17:35:03,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-23 17:35:03,254 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 17:35:03,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:03,255 INFO L225 Difference]: With dead ends: 116 [2021-11-23 17:35:03,256 INFO L226 Difference]: Without dead ends: 114 [2021-11-23 17:35:03,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 651 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=628, Invalid=1724, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:35:03,259 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 182 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:03,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 100 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 17:35:03,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-23 17:35:03,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 34. [2021-11-23 17:35:03,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.303030303030303) internal successors, (43), 33 states have internal predecessors, (43), 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 17:35:03,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-11-23 17:35:03,273 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 11 [2021-11-23 17:35:03,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:03,273 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-11-23 17:35:03,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:03,274 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-11-23 17:35:03,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:35:03,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:03,275 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:03,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:03,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:03,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:03,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:03,877 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:03,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:03,878 INFO L85 PathProgramCache]: Analyzing trace with hash 247095473, now seen corresponding path program 2 times [2021-11-23 17:35:03,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:03,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [101762876] [2021-11-23 17:35:03,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:03,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:03,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:03,879 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:03,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:35:03,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:03,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:03,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:03,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:04,176 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:04,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:04,773 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:04,774 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:04,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [101762876] [2021-11-23 17:35:04,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [101762876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:04,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1132163238] [2021-11-23 17:35:04,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:04,775 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:04,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:04,780 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:04,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:35:04,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:04,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:04,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:04,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:05,114 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:05,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:05,593 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:05,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1132163238] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:05,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581882859] [2021-11-23 17:35:05,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:05,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:05,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:05,596 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:05,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:35:05,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:05,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:05,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:05,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:05,796 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:05,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:06,432 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:06,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581882859] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:06,433 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:06,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9, 9, 9, 10] total 30 [2021-11-23 17:35:06,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384033104] [2021-11-23 17:35:06,433 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:06,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:35:06,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:06,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:35:06,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:35:06,436 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 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 17:35:06,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:06,752 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-11-23 17:35:06,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:35:06,752 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 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 15 [2021-11-23 17:35:06,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:06,754 INFO L225 Difference]: With dead ends: 46 [2021-11-23 17:35:06,754 INFO L226 Difference]: Without dead ends: 33 [2021-11-23 17:35:06,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:35:06,756 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 35 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:06,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 66 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 90 Invalid, 0 Unknown, 24 Unchecked, 0.2s Time] [2021-11-23 17:35:06,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-23 17:35:06,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-23 17:35:06,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.28125) internal successors, (41), 32 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2021-11-23 17:35:06,765 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 15 [2021-11-23 17:35:06,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:06,765 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2021-11-23 17:35:06,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 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 17:35:06,766 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2021-11-23 17:35:06,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:35:06,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:06,767 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:06,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:06,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:07,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:07,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:07,381 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:07,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:07,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1756149133, now seen corresponding path program 3 times [2021-11-23 17:35:07,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:07,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508363573] [2021-11-23 17:35:07,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:07,382 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:07,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:07,383 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:07,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:35:07,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:35:07,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:07,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:07,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:07,562 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 17:35:07,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:08,065 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 17:35:08,065 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:08,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [508363573] [2021-11-23 17:35:08,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [508363573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:08,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [116567819] [2021-11-23 17:35:08,066 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:08,066 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:08,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:08,068 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:08,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:35:08,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:35:08,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:08,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:08,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:08,219 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 17:35:08,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:08,434 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 17:35:08,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [116567819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:08,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76549921] [2021-11-23 17:35:08,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:08,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:08,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:08,436 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:08,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:35:08,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:35:08,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:08,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:08,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:08,577 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 17:35:08,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:08,693 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 17:35:08,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76549921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:08,694 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:08,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 9, 9, 10, 12] total 24 [2021-11-23 17:35:08,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277841237] [2021-11-23 17:35:08,694 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:08,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 17:35:08,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:08,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 17:35:08,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:35:08,696 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 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 17:35:12,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:12,938 INFO L93 Difference]: Finished difference Result 188 states and 214 transitions. [2021-11-23 17:35:12,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-23 17:35:12,939 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 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 15 [2021-11-23 17:35:12,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:12,941 INFO L225 Difference]: With dead ends: 188 [2021-11-23 17:35:12,941 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 17:35:12,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2504 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1727, Invalid=5929, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:35:12,946 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 581 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:12,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [581 Valid, 139 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 17:35:12,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 17:35:12,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 56. [2021-11-23 17:35:12,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.3272727272727274) internal successors, (73), 55 states have internal predecessors, (73), 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 17:35:12,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-11-23 17:35:12,966 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 15 [2021-11-23 17:35:12,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:12,966 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-11-23 17:35:12,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 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 17:35:12,966 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-11-23 17:35:12,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 17:35:12,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:12,968 INFO L514 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:12,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:13,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-23 17:35:13,399 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-23 17:35:13,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:13,579 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:13,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:13,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1497652748, now seen corresponding path program 3 times [2021-11-23 17:35:13,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:13,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1747932483] [2021-11-23 17:35:13,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:13,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:13,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:13,581 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:13,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:35:13,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:35:13,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:13,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:13,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:13,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:14,220 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,220 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:14,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1747932483] [2021-11-23 17:35:14,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1747932483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:14,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [680610612] [2021-11-23 17:35:14,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:14,221 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:14,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:14,222 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:14,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:35:14,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:35:14,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:14,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:14,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:14,383 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:14,455 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [680610612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:14,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870349299] [2021-11-23 17:35:14,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:14,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:14,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:14,457 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:14,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:35:14,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:35:14,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:14,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:14,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:14,610 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:14,682 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870349299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:14,683 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:14,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15, 15] total 28 [2021-11-23 17:35:14,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930831359] [2021-11-23 17:35:14,687 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:14,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 17:35:14,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:14,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 17:35:14,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=559, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:35:14,691 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 28 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 17:35:38,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:38,280 INFO L93 Difference]: Finished difference Result 495 states and 538 transitions. [2021-11-23 17:35:38,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2021-11-23 17:35:38,281 INFO L78 Accepts]: Start accepts. Automaton has has 28 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) Word has length 18 [2021-11-23 17:35:38,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:38,286 INFO L225 Difference]: With dead ends: 495 [2021-11-23 17:35:38,286 INFO L226 Difference]: Without dead ends: 493 [2021-11-23 17:35:38,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15331 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=8209, Invalid=30011, Unknown=0, NotChecked=0, Total=38220 [2021-11-23 17:35:38,301 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1293 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 760 mSolverCounterSat, 840 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1293 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 1600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 840 IncrementalHoareTripleChecker+Valid, 760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:38,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1293 Valid, 379 Invalid, 1600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [840 Valid, 760 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-23 17:35:38,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-23 17:35:38,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 93. [2021-11-23 17:35:38,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.25) internal successors, (115), 92 states have internal predecessors, (115), 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 17:35:38,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 115 transitions. [2021-11-23 17:35:38,334 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 115 transitions. Word has length 18 [2021-11-23 17:35:38,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:38,335 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 115 transitions. [2021-11-23 17:35:38,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 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 17:35:38,335 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 115 transitions. [2021-11-23 17:35:38,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 17:35:38,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:38,337 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:38,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:38,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:38,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:38,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:38,950 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:38,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:38,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1683466701, now seen corresponding path program 4 times [2021-11-23 17:35:38,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:38,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1582364334] [2021-11-23 17:35:38,951 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:35:38,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:38,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:38,954 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:38,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:35:39,021 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:35:39,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:39,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:39,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:39,426 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:39,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:40,336 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:40,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1582364334] [2021-11-23 17:35:40,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1582364334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1732029913] [2021-11-23 17:35:40,337 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:35:40,337 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:40,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:40,339 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:40,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 17:35:40,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:35:40,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:40,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:40,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:40,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:41,685 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:41,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1732029913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:41,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783546537] [2021-11-23 17:35:41,685 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:35:41,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:41,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:41,693 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:41,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 17:35:41,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:35:41,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:41,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:41,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:42,001 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:42,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:42,917 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:42,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783546537] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:42,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:42,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 11, 11, 11, 12] total 41 [2021-11-23 17:35:42,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45764538] [2021-11-23 17:35:42,918 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:42,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 17:35:42,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:42,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 17:35:42,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1391, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 17:35:42,920 INFO L87 Difference]: Start difference. First operand 93 states and 115 transitions. Second operand has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 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 17:35:43,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:43,730 INFO L93 Difference]: Finished difference Result 106 states and 127 transitions. [2021-11-23 17:35:43,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:35:43,730 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 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) Word has length 19 [2021-11-23 17:35:43,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:43,731 INFO L225 Difference]: With dead ends: 106 [2021-11-23 17:35:43,731 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 17:35:43,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=394, Invalid=1768, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:35:43,734 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 51 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:43,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 121 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 168 Invalid, 0 Unknown, 28 Unchecked, 0.2s Time] [2021-11-23 17:35:43,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 17:35:43,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-23 17:35:43,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.2417582417582418) internal successors, (113), 91 states have internal predecessors, (113), 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 17:35:43,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 113 transitions. [2021-11-23 17:35:43,755 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 113 transitions. Word has length 19 [2021-11-23 17:35:43,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:43,755 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 113 transitions. [2021-11-23 17:35:43,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 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 17:35:43,756 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 113 transitions. [2021-11-23 17:35:43,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:35:43,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:43,757 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:43,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:43,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:44,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:44,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:44,359 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:44,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:44,359 INFO L85 PathProgramCache]: Analyzing trace with hash 637436081, now seen corresponding path program 5 times [2021-11-23 17:35:44,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:44,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [931411492] [2021-11-23 17:35:44,360 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:35:44,360 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:44,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:44,361 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:44,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:35:44,400 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:35:44,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:44,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:35:44,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:44,695 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:44,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:45,964 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:45,964 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:45,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [931411492] [2021-11-23 17:35:45,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [931411492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:45,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1747477124] [2021-11-23 17:35:45,965 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:35:45,965 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:45,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:45,969 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:45,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:35:46,090 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:35:46,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:46,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:35:46,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:46,274 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:46,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:47,122 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:47,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1747477124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:47,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11899028] [2021-11-23 17:35:47,122 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:35:47,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:47,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:47,123 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:47,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 17:35:47,160 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:35:47,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:47,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:35:47,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:47,386 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:47,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:47,982 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:47,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11899028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:47,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:47,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 13, 13, 13, 14] total 43 [2021-11-23 17:35:47,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148966834] [2021-11-23 17:35:47,983 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:47,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 17:35:47,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:47,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 17:35:47,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1546, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:35:47,985 INFO L87 Difference]: Start difference. First operand 92 states and 113 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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 17:35:48,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:48,710 INFO L93 Difference]: Finished difference Result 108 states and 128 transitions. [2021-11-23 17:35:48,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:35:48,710 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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 23 [2021-11-23 17:35:48,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:48,711 INFO L225 Difference]: With dead ends: 108 [2021-11-23 17:35:48,711 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 17:35:48,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=412, Invalid=2038, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:35:48,714 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 87 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:48,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 143 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 215 Invalid, 0 Unknown, 60 Unchecked, 0.3s Time] [2021-11-23 17:35:48,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 17:35:48,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 17:35:48,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.2333333333333334) internal successors, (111), 90 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 17:35:48,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 111 transitions. [2021-11-23 17:35:48,737 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 111 transitions. Word has length 23 [2021-11-23 17:35:48,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:48,738 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 111 transitions. [2021-11-23 17:35:48,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 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 17:35:48,738 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 111 transitions. [2021-11-23 17:35:48,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 17:35:48,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:48,740 INFO L514 BasicCegarLoop]: trace histogram [12, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:48,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-11-23 17:35:48,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:49,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:49,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:49,342 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:49,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:49,343 INFO L85 PathProgramCache]: Analyzing trace with hash -607259247, now seen corresponding path program 6 times [2021-11-23 17:35:49,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:49,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2121226350] [2021-11-23 17:35:49,343 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:35:49,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:49,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:49,344 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:49,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:35:49,399 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:35:49,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:49,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:35:49,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:49,607 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:49,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:50,596 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:50,596 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:50,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2121226350] [2021-11-23 17:35:50,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2121226350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:50,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2035064874] [2021-11-23 17:35:50,597 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:35:50,597 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:50,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:50,598 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:50,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 17:35:50,704 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:35:50,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:50,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:35:50,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:50,762 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:50,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:51,332 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2035064874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:51,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491166812] [2021-11-23 17:35:51,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:35:51,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:51,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:51,334 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:51,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 17:35:51,390 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:35:51,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:51,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:35:51,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:51,748 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491166812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:51,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:51,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 16, 16, 18, 20] total 47 [2021-11-23 17:35:51,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921640432] [2021-11-23 17:35:51,749 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:51,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 17:35:51,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:51,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 17:35:51,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=1562, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:35:51,752 INFO L87 Difference]: Start difference. First operand 91 states and 111 transitions. Second operand has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 47 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 17:36:40,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:40,829 INFO L93 Difference]: Finished difference Result 623 states and 686 transitions. [2021-11-23 17:36:40,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 287 states. [2021-11-23 17:36:40,830 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 47 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 25 [2021-11-23 17:36:40,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:40,833 INFO L225 Difference]: With dead ends: 623 [2021-11-23 17:36:40,834 INFO L226 Difference]: Without dead ends: 618 [2021-11-23 17:36:40,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37842 ImplicationChecksByTransitivity, 47.5s TimeCoverageRelationStatistics Valid=16155, Invalid=75957, Unknown=0, NotChecked=0, Total=92112 [2021-11-23 17:36:40,844 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 2778 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 1707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2778 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 2554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1707 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:40,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2778 Valid, 420 Invalid, 2554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1707 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 17:36:40,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-11-23 17:36:40,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 112. [2021-11-23 17:36:40,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.3513513513513513) internal successors, (150), 111 states have internal predecessors, (150), 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 17:36:40,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 150 transitions. [2021-11-23 17:36:40,913 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 150 transitions. Word has length 25 [2021-11-23 17:36:40,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:40,913 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 150 transitions. [2021-11-23 17:36:40,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 47 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 17:36:40,914 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 150 transitions. [2021-11-23 17:36:40,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 17:36:40,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:40,915 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:40,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:41,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:41,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:41,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:41,537 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:41,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:41,537 INFO L85 PathProgramCache]: Analyzing trace with hash -856632115, now seen corresponding path program 7 times [2021-11-23 17:36:41,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:41,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1593672572] [2021-11-23 17:36:41,537 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:36:41,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:41,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:41,539 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:41,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:36:41,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:41,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:36:41,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:41,991 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:41,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:43,822 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 35 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:43,822 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:43,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1593672572] [2021-11-23 17:36:43,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1593672572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:43,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [134523572] [2021-11-23 17:36:43,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:36:43,823 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:43,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:43,824 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:43,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 17:36:43,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:43,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:36:43,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:44,100 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:44,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:45,491 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:45,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [134523572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:45,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015186757] [2021-11-23 17:36:45,491 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:36:45,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:45,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:45,492 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:45,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 17:36:45,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:45,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:36:45,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:45,793 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:45,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:47,506 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:47,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015186757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:47,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:47,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 15, 15, 15, 16] total 52 [2021-11-23 17:36:47,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546500425] [2021-11-23 17:36:47,507 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:47,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 17:36:47,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:47,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 17:36:47,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=2293, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:36:47,510 INFO L87 Difference]: Start difference. First operand 112 states and 150 transitions. Second operand has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 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 17:36:48,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:48,692 INFO L93 Difference]: Finished difference Result 131 states and 168 transitions. [2021-11-23 17:36:48,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:36:48,692 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 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 27 [2021-11-23 17:36:48,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:48,693 INFO L225 Difference]: With dead ends: 131 [2021-11-23 17:36:48,693 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 17:36:48,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=576, Invalid=2964, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:36:48,696 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 100 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:48,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 119 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 219 Invalid, 0 Unknown, 75 Unchecked, 0.3s Time] [2021-11-23 17:36:48,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 17:36:48,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-23 17:36:48,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.3454545454545455) internal successors, (148), 110 states have internal predecessors, (148), 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 17:36:48,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 148 transitions. [2021-11-23 17:36:48,732 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 148 transitions. Word has length 27 [2021-11-23 17:36:48,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:48,733 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 148 transitions. [2021-11-23 17:36:48,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 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 17:36:48,733 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 148 transitions. [2021-11-23 17:36:48,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:36:48,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:48,734 INFO L514 BasicCegarLoop]: trace histogram [13, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:48,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:48,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:49,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:49,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:49,336 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:49,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:49,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1579823443, now seen corresponding path program 8 times [2021-11-23 17:36:49,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:49,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1948118872] [2021-11-23 17:36:49,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:36:49,337 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:49,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:49,338 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:49,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:36:49,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:36:49,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:36:49,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:36:49,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:49,570 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:49,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:50,143 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:50,143 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:50,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1948118872] [2021-11-23 17:36:50,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1948118872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:50,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [230725751] [2021-11-23 17:36:50,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:36:50,144 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:50,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:50,145 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:50,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 17:36:50,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:36:50,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:36:50,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:36:50,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:50,336 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:50,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:50,459 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:50,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [230725751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:50,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559249710] [2021-11-23 17:36:50,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:36:50,460 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:50,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:50,461 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:50,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 17:36:50,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:36:50,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:36:50,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:36:50,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:50,671 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:50,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:52,265 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:52,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559249710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:52,266 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:52,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 19, 21] total 50 [2021-11-23 17:36:52,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641168738] [2021-11-23 17:36:52,266 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:52,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:36:52,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:52,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:36:52,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=1775, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:36:52,268 INFO L87 Difference]: Start difference. First operand 111 states and 148 transitions. Second operand has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 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 17:37:47,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:47,265 INFO L93 Difference]: Finished difference Result 682 states and 745 transitions. [2021-11-23 17:37:47,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 313 states. [2021-11-23 17:37:47,266 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 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 29 [2021-11-23 17:37:47,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:47,270 INFO L225 Difference]: With dead ends: 682 [2021-11-23 17:37:47,270 INFO L226 Difference]: Without dead ends: 677 [2021-11-23 17:37:47,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 329 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43557 ImplicationChecksByTransitivity, 53.9s TimeCoverageRelationStatistics Valid=18580, Invalid=90650, Unknown=0, NotChecked=0, Total=109230 [2021-11-23 17:37:47,280 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 2901 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 1837 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2901 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 2768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1837 IncrementalHoareTripleChecker+Valid, 931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:47,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2901 Valid, 449 Invalid, 2768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1837 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 17:37:47,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-11-23 17:37:47,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 130. [2021-11-23 17:37:47,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.3410852713178294) internal successors, (173), 129 states have internal predecessors, (173), 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 17:37:47,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 173 transitions. [2021-11-23 17:37:47,369 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 173 transitions. Word has length 29 [2021-11-23 17:37:47,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:47,370 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 173 transitions. [2021-11-23 17:37:47,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 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 17:37:47,371 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 173 transitions. [2021-11-23 17:37:47,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 17:37:47,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:47,373 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:47,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:47,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:47,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:47,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:47,985 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:47,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:47,986 INFO L85 PathProgramCache]: Analyzing trace with hash 377831601, now seen corresponding path program 9 times [2021-11-23 17:37:47,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:47,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1810551018] [2021-11-23 17:37:47,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:37:47,986 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:47,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:47,987 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:47,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:37:48,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:37:48,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:37:48,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:37:48,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:48,429 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:48,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:50,760 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:50,761 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:50,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1810551018] [2021-11-23 17:37:50,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1810551018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:50,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [149420907] [2021-11-23 17:37:50,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:37:50,762 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:50,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:50,763 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:50,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:37:50,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:37:50,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:37:50,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:37:50,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:51,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:53,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [149420907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:53,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752254298] [2021-11-23 17:37:53,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:37:53,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:53,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:53,219 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:53,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:37:53,283 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 17:37:53,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:37:53,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:37:53,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:53,742 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:53,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:56,079 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:56,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752254298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:56,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:56,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 17, 17, 17, 18] total 62 [2021-11-23 17:37:56,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401966870] [2021-11-23 17:37:56,081 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:56,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-23 17:37:56,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:56,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-23 17:37:56,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=3333, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 17:37:56,083 INFO L87 Difference]: Start difference. First operand 130 states and 173 transitions. Second operand has 62 states, 62 states have (on average 1.6129032258064515) internal successors, (100), 62 states have internal predecessors, (100), 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 17:37:57,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:57,485 INFO L93 Difference]: Finished difference Result 152 states and 194 transitions. [2021-11-23 17:37:57,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:37:57,485 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.6129032258064515) internal successors, (100), 62 states have internal predecessors, (100), 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 31 [2021-11-23 17:37:57,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:57,487 INFO L225 Difference]: With dead ends: 152 [2021-11-23 17:37:57,487 INFO L226 Difference]: Without dead ends: 129 [2021-11-23 17:37:57,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1217 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=721, Invalid=4249, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:37:57,489 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 112 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:57,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 191 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 306 Invalid, 0 Unknown, 118 Unchecked, 0.5s Time] [2021-11-23 17:37:57,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-23 17:37:57,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-11-23 17:37:57,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.3359375) internal successors, (171), 128 states have internal predecessors, (171), 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 17:37:57,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 171 transitions. [2021-11-23 17:37:57,574 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 171 transitions. Word has length 31 [2021-11-23 17:37:57,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:57,574 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 171 transitions. [2021-11-23 17:37:57,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.6129032258064515) internal successors, (100), 62 states have internal predecessors, (100), 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 17:37:57,574 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 171 transitions. [2021-11-23 17:37:57,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 17:37:57,575 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:57,575 INFO L514 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:57,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:57,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:57,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 17:37:58,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:58,178 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:58,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:58,178 INFO L85 PathProgramCache]: Analyzing trace with hash -66675092, now seen corresponding path program 4 times [2021-11-23 17:37:58,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:58,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [409846307] [2021-11-23 17:37:58,179 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:37:58,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:58,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:58,182 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:58,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:37:58,272 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:37:58,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:37:58,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:37:58,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:58,716 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:58,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:00,529 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:00,529 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:00,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [409846307] [2021-11-23 17:38:00,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [409846307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:00,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1832771610] [2021-11-23 17:38:00,530 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:38:00,530 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:00,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:00,531 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:00,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:38:00,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:38:00,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:38:00,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:00,807 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:00,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:00,915 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:00,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1832771610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:00,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215569902] [2021-11-23 17:38:00,915 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:38:00,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:00,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:00,916 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:00,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aef9fdc9-d9c7-4ec0-a3ef-91acadf8289c/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:38:00,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:38:00,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:38:00,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:01,065 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:01,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:01,158 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:01,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215569902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:01,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:01,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29, 29] total 56 [2021-11-23 17:38:01,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724160874] [2021-11-23 17:38:01,159 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:01,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 17:38:01,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:01,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 17:38:01,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=2295, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:38:01,160 INFO L87 Difference]: Start difference. First operand 129 states and 171 transitions. Second operand has 56 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 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)