./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-properties/list_search-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/list-properties/list_search-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 04611f7cb9bdc3bfbd4f2358731c54027c595e1d .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-29 08:55:57,390 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 08:55:57,392 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 08:55:57,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 08:55:57,423 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 08:55:57,425 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 08:55:57,427 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 08:55:57,430 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 08:55:57,432 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 08:55:57,435 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 08:55:57,436 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 08:55:57,439 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 08:55:57,439 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 08:55:57,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 08:55:57,442 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 08:55:57,444 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 08:55:57,445 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 08:55:57,446 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 08:55:57,447 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 08:55:57,451 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 08:55:57,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 08:55:57,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 08:55:57,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 08:55:57,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 08:55:57,459 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 08:55:57,459 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 08:55:57,460 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 08:55:57,461 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 08:55:57,461 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 08:55:57,462 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 08:55:57,462 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 08:55:57,462 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 08:55:57,463 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 08:55:57,464 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 08:55:57,465 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 08:55:57,465 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 08:55:57,465 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 08:55:57,465 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 08:55:57,466 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 08:55:57,467 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 08:55:57,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 08:55:57,470 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 08:55:57,498 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 08:55:57,498 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 08:55:57,499 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 08:55:57,499 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 08:55:57,501 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 08:55:57,501 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 08:55:57,501 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 08:55:57,501 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 08:55:57,501 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 08:55:57,501 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 08:55:57,502 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 08:55:57,502 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 08:55:57,503 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 08:55:57,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 08:55:57,503 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 08:55:57,503 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 08:55:57,511 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 04611f7cb9bdc3bfbd4f2358731c54027c595e1d [2021-08-29 08:55:57,740 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 08:55:57,756 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 08:55:57,758 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 08:55:57,759 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 08:55:57,759 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 08:55:57,760 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-properties/list_search-1.i [2021-08-29 08:55:57,810 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75885337f/97a8d115170d47408a97ed0df4c716d6/FLAG0ca5caa52 [2021-08-29 08:55:58,180 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 08:55:58,181 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list_search-1.i [2021-08-29 08:55:58,187 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75885337f/97a8d115170d47408a97ed0df4c716d6/FLAG0ca5caa52 [2021-08-29 08:55:58,198 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75885337f/97a8d115170d47408a97ed0df4c716d6 [2021-08-29 08:55:58,200 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 08:55:58,202 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 08:55:58,204 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 08:55:58,204 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 08:55:58,206 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 08:55:58,207 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,208 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59f05b0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58, skipping insertion in model container [2021-08-29 08:55:58,208 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,212 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 08:55:58,244 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 08:55:58,385 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list_search-1.i[813,826] [2021-08-29 08:55:58,503 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 08:55:58,510 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 08:55:58,518 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list_search-1.i[813,826] [2021-08-29 08:55:58,546 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 08:55:58,574 INFO L208 MainTranslator]: Completed translation [2021-08-29 08:55:58,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58 WrapperNode [2021-08-29 08:55:58,576 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 08:55:58,576 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 08:55:58,577 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 08:55:58,577 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 08:55:58,581 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,604 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,629 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 08:55:58,630 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 08:55:58,630 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 08:55:58,630 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 08:55:58,635 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,635 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,640 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,640 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,645 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,650 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 08:55:58,650 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 08:55:58,650 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 08:55:58,650 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 08:55:58,651 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (1/1) ... [2021-08-29 08:55:58,663 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 08:55:58,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 08:55:58,678 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-29 08:55:58,679 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-29 08:55:58,699 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-29 08:55:58,699 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-29 08:55:58,699 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 08:55:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 08:55:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 08:55:58,858 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 08:55:58,859 INFO L299 CfgBuilder]: Removed 18 assume(true) statements. [2021-08-29 08:55:58,860 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 08:55:58 BoogieIcfgContainer [2021-08-29 08:55:58,860 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 08:55:58,861 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 08:55:58,861 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 08:55:58,863 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 08:55:58,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 08:55:58" (1/3) ... [2021-08-29 08:55:58,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66dfc622 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 08:55:58, skipping insertion in model container [2021-08-29 08:55:58,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 08:55:58" (2/3) ... [2021-08-29 08:55:58,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66dfc622 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 08:55:58, skipping insertion in model container [2021-08-29 08:55:58,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 08:55:58" (3/3) ... [2021-08-29 08:55:58,864 INFO L111 eAbstractionObserver]: Analyzing ICFG list_search-1.i [2021-08-29 08:55:58,868 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 08:55:58,868 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 08:55:58,895 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 08:55:58,899 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, mConcurrency=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 [2021-08-29 08:55:58,900 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 08:55:58,908 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 25 states have (on average 1.44) internal successors, (36), 26 states have internal predecessors, (36), 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) [2021-08-29 08:55:58,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-08-29 08:55:58,911 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:55:58,911 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:55:58,911 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:55:58,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:55:58,914 INFO L82 PathProgramCache]: Analyzing trace with hash -332178203, now seen corresponding path program 1 times [2021-08-29 08:55:58,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:55:58,920 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438868403] [2021-08-29 08:55:58,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:55:58,921 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:55:59,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:55:59,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:55:59,122 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:55:59,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438868403] [2021-08-29 08:55:59,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438868403] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 08:55:59,122 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 08:55:59,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-08-29 08:55:59,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768606696] [2021-08-29 08:55:59,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-29 08:55:59,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:55:59,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-29 08:55:59,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-29 08:55:59,142 INFO L87 Difference]: Start difference. First operand has 27 states, 25 states have (on average 1.44) internal successors, (36), 26 states have internal predecessors, (36), 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 4 states, 4 states have (on average 4.75) internal successors, (19), 4 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) [2021-08-29 08:55:59,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:55:59,234 INFO L93 Difference]: Finished difference Result 49 states and 67 transitions. [2021-08-29 08:55:59,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-29 08:55:59,236 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-08-29 08:55:59,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:55:59,240 INFO L225 Difference]: With dead ends: 49 [2021-08-29 08:55:59,240 INFO L226 Difference]: Without dead ends: 22 [2021-08-29 08:55:59,243 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.61ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-08-29 08:55:59,246 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 38 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.23ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.94ms IncrementalHoareTripleChecker+Time [2021-08-29 08:55:59,246 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 0 Invalid, 52 Unknown, 0 Unchecked, 1.23ms Time], IncrementalHoareTripleChecker [13 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 70.94ms Time] [2021-08-29 08:55:59,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-08-29 08:55:59,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-08-29 08:55:59,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-08-29 08:55:59,273 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2021-08-29 08:55:59,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:55:59,274 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-08-29 08:55:59,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 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) [2021-08-29 08:55:59,274 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-08-29 08:55:59,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-08-29 08:55:59,275 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:55:59,275 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:55:59,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 08:55:59,276 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:55:59,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:55:59,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1321983588, now seen corresponding path program 1 times [2021-08-29 08:55:59,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:55:59,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431381555] [2021-08-29 08:55:59,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:55:59,279 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:55:59,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:55:59,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:55:59,381 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:55:59,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431381555] [2021-08-29 08:55:59,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431381555] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 08:55:59,381 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 08:55:59,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-29 08:55:59,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571902207] [2021-08-29 08:55:59,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-29 08:55:59,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:55:59,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-29 08:55:59,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-29 08:55:59,383 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:55:59,493 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-08-29 08:55:59,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-29 08:55:59,493 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-08-29 08:55:59,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:55:59,495 INFO L225 Difference]: With dead ends: 38 [2021-08-29 08:55:59,495 INFO L226 Difference]: Without dead ends: 30 [2021-08-29 08:55:59,499 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.99ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-08-29 08:55:59,500 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 49 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.43ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 72.28ms IncrementalHoareTripleChecker+Time [2021-08-29 08:55:59,500 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 0 Invalid, 90 Unknown, 0 Unchecked, 3.43ms Time], IncrementalHoareTripleChecker [14 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 72.28ms Time] [2021-08-29 08:55:59,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-08-29 08:55:59,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-08-29 08:55:59,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-08-29 08:55:59,510 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2021-08-29 08:55:59,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:55:59,512 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-08-29 08:55:59,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,512 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-08-29 08:55:59,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-08-29 08:55:59,513 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:55:59,513 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:55:59,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-29 08:55:59,513 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:55:59,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:55:59,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1379241890, now seen corresponding path program 1 times [2021-08-29 08:55:59,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:55:59,517 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525195797] [2021-08-29 08:55:59,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:55:59,518 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:55:59,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:55:59,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:55:59,621 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:55:59,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525195797] [2021-08-29 08:55:59,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525195797] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 08:55:59,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 08:55:59,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-29 08:55:59,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885629668] [2021-08-29 08:55:59,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-29 08:55:59,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:55:59,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-29 08:55:59,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-29 08:55:59,625 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:55:59,746 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-08-29 08:55:59,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-29 08:55:59,746 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-08-29 08:55:59,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:55:59,748 INFO L225 Difference]: With dead ends: 30 [2021-08-29 08:55:59,748 INFO L226 Difference]: Without dead ends: 25 [2021-08-29 08:55:59,748 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.06ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-08-29 08:55:59,754 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 43 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.24ms SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.10ms IncrementalHoareTripleChecker+Time [2021-08-29 08:55:59,755 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 0 Invalid, 107 Unknown, 0 Unchecked, 2.24ms Time], IncrementalHoareTripleChecker [17 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 68.10ms Time] [2021-08-29 08:55:59,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-08-29 08:55:59,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-08-29 08:55:59,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 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) [2021-08-29 08:55:59,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-08-29 08:55:59,762 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2021-08-29 08:55:59,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:55:59,762 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-08-29 08:55:59,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 08:55:59,762 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-08-29 08:55:59,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-29 08:55:59,763 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:55:59,763 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:55:59,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-29 08:55:59,763 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:55:59,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:55:59,764 INFO L82 PathProgramCache]: Analyzing trace with hash -633881513, now seen corresponding path program 1 times [2021-08-29 08:55:59,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:55:59,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074290302] [2021-08-29 08:55:59,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:55:59,764 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:55:59,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:55:59,878 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:55:59,879 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:55:59,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074290302] [2021-08-29 08:55:59,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074290302] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 08:55:59,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310375559] [2021-08-29 08:55:59,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:55:59,879 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:55:59,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 08:55:59,886 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 08:55:59,892 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 08:55:59,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:55:59,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-29 08:55:59,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 08:56:00,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-29 08:56:00,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2021-08-29 08:56:00,171 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:00,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 08:56:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:00,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310375559] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 08:56:00,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 08:56:00,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 16 [2021-08-29 08:56:00,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335503812] [2021-08-29 08:56:00,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-29 08:56:00,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:56:00,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-29 08:56:00,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-08-29 08:56:00,248 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 16 states, 16 states have (on average 2.5) internal successors, (40), 16 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) [2021-08-29 08:56:00,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:56:00,528 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-08-29 08:56:00,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-29 08:56:00,529 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 16 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 24 [2021-08-29 08:56:00,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:56:00,529 INFO L225 Difference]: With dead ends: 45 [2021-08-29 08:56:00,529 INFO L226 Difference]: Without dead ends: 37 [2021-08-29 08:56:00,530 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 205.71ms TimeCoverageRelationStatistics Valid=176, Invalid=424, Unknown=0, NotChecked=0, Total=600 [2021-08-29 08:56:00,530 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 157 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 101.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.66ms SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.93ms IncrementalHoareTripleChecker+Time [2021-08-29 08:56:00,531 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 0 Invalid, 243 Unknown, 0 Unchecked, 3.66ms Time], IncrementalHoareTripleChecker [105 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 130.93ms Time] [2021-08-29 08:56:00,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-08-29 08:56:00,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 27. [2021-08-29 08:56:00,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 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) [2021-08-29 08:56:00,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-08-29 08:56:00,534 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2021-08-29 08:56:00,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:56:00,534 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-08-29 08:56:00,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 16 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) [2021-08-29 08:56:00,535 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-08-29 08:56:00,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-29 08:56:00,535 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:56:00,535 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:56:00,555 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 08:56:00,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:00,736 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:56:00,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:56:00,737 INFO L82 PathProgramCache]: Analyzing trace with hash -691139815, now seen corresponding path program 1 times [2021-08-29 08:56:00,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:56:00,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438629421] [2021-08-29 08:56:00,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:56:00,737 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:56:00,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:56:00,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:00,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:56:00,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438629421] [2021-08-29 08:56:00,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438629421] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 08:56:00,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116155951] [2021-08-29 08:56:00,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:56:00,931 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:00,932 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 08:56:00,945 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 08:56:00,990 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 08:56:01,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:56:01,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 44 conjunts are in the unsatisfiable core [2021-08-29 08:56:01,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 08:56:01,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-29 08:56:01,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:01,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 7 [2021-08-29 08:56:01,107 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-08-29 08:56:01,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 22 [2021-08-29 08:56:01,117 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-29 08:56:01,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-29 08:56:01,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 47 [2021-08-29 08:56:01,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:01,161 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-08-29 08:56:01,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 34 [2021-08-29 08:56:01,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-29 08:56:01,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 29 [2021-08-29 08:56:01,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2021-08-29 08:56:01,311 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-08-29 08:56:01,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 20 [2021-08-29 08:56:01,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:01,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 08:56:02,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:02,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116155951] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 08:56:02,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 08:56:02,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 28 [2021-08-29 08:56:02,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279741393] [2021-08-29 08:56:02,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-08-29 08:56:02,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:56:02,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-08-29 08:56:02,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=679, Unknown=1, NotChecked=0, Total=756 [2021-08-29 08:56:02,043 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 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) [2021-08-29 08:56:02,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:56:02,370 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-08-29 08:56:02,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-29 08:56:02,371 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 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 24 [2021-08-29 08:56:02,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:56:02,371 INFO L225 Difference]: With dead ends: 33 [2021-08-29 08:56:02,371 INFO L226 Difference]: Without dead ends: 28 [2021-08-29 08:56:02,372 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 714.02ms TimeCoverageRelationStatistics Valid=154, Invalid=1035, Unknown=1, NotChecked=0, Total=1190 [2021-08-29 08:56:02,372 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 51 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 155.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.49ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 183.88ms IncrementalHoareTripleChecker+Time [2021-08-29 08:56:02,372 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 0 Invalid, 487 Unknown, 0 Unchecked, 1.49ms Time], IncrementalHoareTripleChecker [14 Valid, 361 Invalid, 0 Unknown, 112 Unchecked, 183.88ms Time] [2021-08-29 08:56:02,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-08-29 08:56:02,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-08-29 08:56:02,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 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) [2021-08-29 08:56:02,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-08-29 08:56:02,375 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 24 [2021-08-29 08:56:02,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:56:02,375 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-08-29 08:56:02,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 28 states have internal predecessors, (53), 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) [2021-08-29 08:56:02,376 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-08-29 08:56:02,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-08-29 08:56:02,376 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:56:02,376 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:56:02,395 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-29 08:56:02,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:02,587 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:56:02,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:56:02,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1263868996, now seen corresponding path program 2 times [2021-08-29 08:56:02,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:56:02,588 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186817700] [2021-08-29 08:56:02,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:56:02,588 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:56:02,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:56:02,742 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:02,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:56:02,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186817700] [2021-08-29 08:56:02,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186817700] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 08:56:02,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770547486] [2021-08-29 08:56:02,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 08:56:02,743 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:02,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 08:56:02,744 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 08:56:02,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 08:56:02,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 08:56:02,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 08:56:02,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 37 conjunts are in the unsatisfiable core [2021-08-29 08:56:02,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 08:56:02,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-29 08:56:02,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-29 08:56:02,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 12 [2021-08-29 08:56:02,963 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-29 08:56:02,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-29 08:56:02,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-29 08:56:02,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:02,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 08:56:02,993 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-29 08:56:02,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 32 [2021-08-29 08:56:03,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 34 [2021-08-29 08:56:03,167 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-29 08:56:03,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 15 [2021-08-29 08:56:03,178 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:03,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 08:56:03,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-08-29 08:56:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:03,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770547486] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 08:56:03,834 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 08:56:03,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2021-08-29 08:56:03,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458040482] [2021-08-29 08:56:03,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-08-29 08:56:03,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 08:56:03,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-08-29 08:56:03,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=676, Unknown=1, NotChecked=0, Total=756 [2021-08-29 08:56:03,835 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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) [2021-08-29 08:56:04,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 08:56:04,168 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-08-29 08:56:04,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-29 08:56:04,168 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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 [2021-08-29 08:56:04,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 08:56:04,169 INFO L225 Difference]: With dead ends: 38 [2021-08-29 08:56:04,169 INFO L226 Difference]: Without dead ends: 30 [2021-08-29 08:56:04,169 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 819.17ms TimeCoverageRelationStatistics Valid=212, Invalid=1347, Unknown=1, NotChecked=0, Total=1560 [2021-08-29 08:56:04,170 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 17 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 96.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.99ms SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 115.31ms IncrementalHoareTripleChecker+Time [2021-08-29 08:56:04,170 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 0 Invalid, 362 Unknown, 0 Unchecked, 0.99ms Time], IncrementalHoareTripleChecker [19 Valid, 231 Invalid, 0 Unknown, 112 Unchecked, 115.31ms Time] [2021-08-29 08:56:04,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-08-29 08:56:04,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-08-29 08:56:04,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 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) [2021-08-29 08:56:04,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-08-29 08:56:04,173 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-08-29 08:56:04,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 08:56:04,173 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-08-29 08:56:04,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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) [2021-08-29 08:56:04,173 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-08-29 08:56:04,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-08-29 08:56:04,173 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 08:56:04,174 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 08:56:04,191 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 08:56:04,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:04,381 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 08:56:04,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 08:56:04,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1321127298, now seen corresponding path program 2 times [2021-08-29 08:56:04,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 08:56:04,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49977061] [2021-08-29 08:56:04,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 08:56:04,383 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 08:56:04,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 08:56:04,680 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:04,680 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 08:56:04,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49977061] [2021-08-29 08:56:04,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49977061] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 08:56:04,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467005860] [2021-08-29 08:56:04,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 08:56:04,680 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 08:56:04,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 08:56:04,681 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 08:56:04,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-29 08:56:04,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 08:56:04,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 08:56:04,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 64 conjunts are in the unsatisfiable core [2021-08-29 08:56:04,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 08:56:04,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-29 08:56:04,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:04,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 11 [2021-08-29 08:56:05,021 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-29 08:56:05,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-08-29 08:56:05,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-08-29 08:56:05,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 52 [2021-08-29 08:56:05,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:05,089 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-08-29 08:56:05,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 61 treesize of output 45 [2021-08-29 08:56:05,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-29 08:56:05,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:05,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-08-29 08:56:05,198 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-08-29 08:56:05,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 70 [2021-08-29 08:56:05,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:05,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 43 [2021-08-29 08:56:05,213 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-08-29 08:56:05,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 52 treesize of output 54 [2021-08-29 08:56:05,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 08:56:05,279 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-29 08:56:05,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 104 [2021-08-29 08:56:05,287 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 08:56:05,293 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-08-29 08:56:05,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 117 treesize of output 120 [2021-08-29 08:56:05,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 08:56:05,308 INFO L354 Elim1Store]: treesize reduction 65, result has 20.7 percent of original size [2021-08-29 08:56:05,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 110 treesize of output 94 [2021-08-29 08:56:05,614 INFO L354 Elim1Store]: treesize reduction 33, result has 19.5 percent of original size [2021-08-29 08:56:05,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 96 treesize of output 56 [2021-08-29 08:56:05,624 INFO L354 Elim1Store]: treesize reduction 26, result has 10.3 percent of original size [2021-08-29 08:56:05,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 37 [2021-08-29 08:56:05,670 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-08-29 08:56:05,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 26 [2021-08-29 08:56:05,705 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 08:56:05,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 09:06:08,964 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 09:06:08,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467005860] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 09:06:08,964 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 09:06:08,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 42 [2021-08-29 09:06:08,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856039791] [2021-08-29 09:06:08,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-08-29 09:06:08,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 09:06:08,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-08-29 09:06:08,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1601, Unknown=3, NotChecked=0, Total=1722 [2021-08-29 09:06:08,966 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 42 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 09:06:09,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 09:06:09,831 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-08-29 09:06:09,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-29 09:06:09,831 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 42 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-08-29 09:06:09,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 09:06:09,832 INFO L225 Difference]: With dead ends: 36 [2021-08-29 09:06:09,832 INFO L226 Difference]: Without dead ends: 31 [2021-08-29 09:06:09,833 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 7477.02ms TimeCoverageRelationStatistics Valid=224, Invalid=2529, Unknown=3, NotChecked=0, Total=2756 [2021-08-29 09:06:09,833 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 31 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 222.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.19ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 280.32ms IncrementalHoareTripleChecker+Time [2021-08-29 09:06:09,833 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 0 Invalid, 690 Unknown, 0 Unchecked, 2.19ms Time], IncrementalHoareTripleChecker [23 Valid, 460 Invalid, 0 Unknown, 207 Unchecked, 280.32ms Time] [2021-08-29 09:06:09,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-08-29 09:06:09,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-08-29 09:06:09,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 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) [2021-08-29 09:06:09,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-08-29 09:06:09,837 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2021-08-29 09:06:09,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 09:06:09,837 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-08-29 09:06:09,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 42 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 09:06:09,837 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-08-29 09:06:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-08-29 09:06:09,838 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 09:06:09,838 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 09:06:09,858 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-29 09:06:10,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 09:06:10,041 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 09:06:10,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 09:06:10,041 INFO L82 PathProgramCache]: Analyzing trace with hash -213891529, now seen corresponding path program 3 times [2021-08-29 09:06:10,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 09:06:10,042 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804499865] [2021-08-29 09:06:10,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 09:06:10,042 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 09:06:10,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 09:06:10,383 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 09:06:10,383 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 09:06:10,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804499865] [2021-08-29 09:06:10,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804499865] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 09:06:10,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794177044] [2021-08-29 09:06:10,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-29 09:06:10,384 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 09:06:10,384 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 09:06:10,384 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 09:06:10,385 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-29 09:06:10,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-29 09:06:10,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 09:06:10,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 60 conjunts are in the unsatisfiable core [2021-08-29 09:06:10,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 09:06:11,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-29 09:06:11,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-29 09:06:11,069 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-29 09:06:11,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-08-29 09:06:11,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 12 [2021-08-29 09:06:11,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-29 09:06:11,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 09:06:11,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 09:06:11,108 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-08-29 09:06:11,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 37 [2021-08-29 09:06:11,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-29 09:06:11,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 09:06:11,196 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-29 09:06:11,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 43 [2021-08-29 09:06:11,208 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-08-29 09:06:11,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 48 [2021-08-29 09:06:11,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-08-29 09:06:11,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 09:06:11,280 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-08-29 09:06:11,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 85 [2021-08-29 09:06:11,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 104 treesize of output 92 [2021-08-29 09:06:11,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-29 09:06:11,292 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-08-29 09:06:11,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 88 [2021-08-29 09:06:11,566 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-08-29 09:06:11,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 97 treesize of output 75 [2021-08-29 09:06:11,637 INFO L354 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2021-08-29 09:06:11,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 26 [2021-08-29 09:06:11,669 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 09:06:11,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 09:06:15,094 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Alternating quantifiers not yet supported [2021-08-29 09:06:15,095 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-29 09:06:15,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-08-29 09:06:15,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829752340] [2021-08-29 09:06:15,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-29 09:06:15,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 09:06:15,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-29 09:06:15,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1356, Unknown=1, NotChecked=0, Total=1482 [2021-08-29 09:06:15,096 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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) [2021-08-29 09:06:16,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 09:06:16,041 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-08-29 09:06:16,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-08-29 09:06:16,042 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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 30 [2021-08-29 09:06:16,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 09:06:16,042 INFO L225 Difference]: With dead ends: 47 [2021-08-29 09:06:16,042 INFO L226 Difference]: Without dead ends: 39 [2021-08-29 09:06:16,043 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 4415.71ms TimeCoverageRelationStatistics Valid=553, Invalid=2638, Unknown=1, NotChecked=0, Total=3192 [2021-08-29 09:06:16,043 INFO L928 BasicCegarLoop]: 0 mSDtfsCounter, 166 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 162.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.39ms SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 189.45ms IncrementalHoareTripleChecker+Time [2021-08-29 09:06:16,044 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 0 Invalid, 353 Unknown, 0 Unchecked, 1.39ms Time], IncrementalHoareTripleChecker [108 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 189.45ms Time] [2021-08-29 09:06:16,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-08-29 09:06:16,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2021-08-29 09:06:16,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-29 09:06:16,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-08-29 09:06:16,051 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2021-08-29 09:06:16,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 09:06:16,051 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-08-29 09:06:16,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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) [2021-08-29 09:06:16,051 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-08-29 09:06:16,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-08-29 09:06:16,052 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 09:06:16,052 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 09:06:16,071 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-29 09:06:16,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 09:06:16,257 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 09:06:16,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 09:06:16,257 INFO L82 PathProgramCache]: Analyzing trace with hash -271149831, now seen corresponding path program 3 times [2021-08-29 09:06:16,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 09:06:16,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201870136] [2021-08-29 09:06:16,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 09:06:16,258 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 09:06:16,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 09:06:16,294 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 09:06:16,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 09:06:16,349 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 09:06:16,349 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 09:06:16,350 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 09:06:16,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-08-29 09:06:16,355 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 09:06:16,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 09:06:16 BoogieIcfgContainer [2021-08-29 09:06:16,401 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 09:06:16,401 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 09:06:16,401 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 09:06:16,402 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 09:06:16,402 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 08:55:58" (3/4) ... [2021-08-29 09:06:16,403 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 09:06:16,440 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 09:06:16,440 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 09:06:16,441 INFO L158 Benchmark]: Toolchain (without parser) took 618239.24ms. Allocated memory was 56.6MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 33.4MB in the beginning and 541.2MB in the end (delta: -507.8MB). Peak memory consumption was 624.0MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,442 INFO L158 Benchmark]: CDTParser took 0.17ms. Allocated memory is still 56.6MB. Free memory was 38.3MB in the beginning and 38.2MB in the end (delta: 73.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 09:06:16,442 INFO L158 Benchmark]: CACSL2BoogieTranslator took 372.13ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 33.3MB in the beginning and 50.1MB in the end (delta: -16.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,442 INFO L158 Benchmark]: Boogie Procedure Inliner took 52.82ms. Allocated memory is still 73.4MB. Free memory was 50.1MB in the beginning and 48.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,442 INFO L158 Benchmark]: Boogie Preprocessor took 19.80ms. Allocated memory is still 73.4MB. Free memory was 48.0MB in the beginning and 46.2MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,442 INFO L158 Benchmark]: RCFGBuilder took 209.65ms. Allocated memory is still 73.4MB. Free memory was 46.2MB in the beginning and 50.3MB in the end (delta: -4.1MB). Peak memory consumption was 12.7MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,443 INFO L158 Benchmark]: TraceAbstraction took 617540.18ms. Allocated memory was 73.4MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 50.0MB in the beginning and 545.4MB in the end (delta: -495.4MB). Peak memory consumption was 620.6MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,443 INFO L158 Benchmark]: Witness Printer took 39.10ms. Allocated memory is still 1.2GB. Free memory was 545.4MB in the beginning and 541.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-08-29 09:06:16,448 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17ms. Allocated memory is still 56.6MB. Free memory was 38.3MB in the beginning and 38.2MB in the end (delta: 73.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 372.13ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 33.3MB in the beginning and 50.1MB in the end (delta: -16.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 52.82ms. Allocated memory is still 73.4MB. Free memory was 50.1MB in the beginning and 48.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 19.80ms. Allocated memory is still 73.4MB. Free memory was 48.0MB in the beginning and 46.2MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 209.65ms. Allocated memory is still 73.4MB. Free memory was 46.2MB in the beginning and 50.3MB in the end (delta: -4.1MB). Peak memory consumption was 12.7MB. Max. memory is 16.1GB. * TraceAbstraction took 617540.18ms. Allocated memory was 73.4MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 50.0MB in the beginning and 545.4MB in the end (delta: -495.4MB). Peak memory consumption was 620.6MB. Max. memory is 16.1GB. * Witness Printer took 39.10ms. Allocated memory is still 1.2GB. Free memory was 545.4MB in the beginning and 541.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L533] mlist *head; VAL [head={0:0}] [L554] int i; [L555] mlist *mylist, *temp; [L542] l = (mlist*)malloc(sizeof(mlist)) [L543] l->key = k VAL [head={0:0}] [L544] COND TRUE head==((void *)0) [L545] l->next = ((void *)0) VAL [head={0:0}] [L550] head = l [L551] return 0; VAL [head={-1:0}] [L542] l = (mlist*)malloc(sizeof(mlist)) [L543] l->key = k VAL [head={-1:0}] [L544] COND FALSE !(head==((void *)0)) [L547] l->key = k [L548] l->next = head VAL [head={-1:0}] [L550] head = l [L551] return 0; VAL [head={-5:0}] [L542] l = (mlist*)malloc(sizeof(mlist)) [L543] l->key = k VAL [head={-5:0}] [L544] COND FALSE !(head==((void *)0)) [L547] l->key = k [L548] l->next = head VAL [head={-5:0}] [L550] head = l [L551] return 0; VAL [head={-3:0}] [L542] l = (mlist*)malloc(sizeof(mlist)) [L543] l->key = k VAL [head={-3:0}] [L544] COND FALSE !(head==((void *)0)) [L547] l->key = k [L548] l->next = head VAL [head={-3:0}] [L550] head = l [L551] return 0; VAL [head={-4:0}] [L535] l = head VAL [head={-4:0}] [L536] l!=((void *)0) && l->key!=k [L536] EXPR l->key [L536] l!=((void *)0) && l->key!=k VAL [head={-4:0}] [L536] COND TRUE l!=((void *)0) && l->key!=k [L537] EXPR l->next [L537] l = l->next [L536] l!=((void *)0) && l->key!=k [L536] EXPR l->key [L536] l!=((void *)0) && l->key!=k VAL [head={-4:0}] [L536] COND TRUE l!=((void *)0) && l->key!=k [L537] EXPR l->next [L537] l = l->next [L536] l!=((void *)0) && l->key!=k [L536] EXPR l->key [L536] l!=((void *)0) && l->key!=k VAL [head={-4:0}] [L536] COND TRUE l!=((void *)0) && l->key!=k [L537] EXPR l->next [L537] l = l->next [L536] l!=((void *)0) && l->key!=k [L536] EXPR l->key [L536] l!=((void *)0) && l->key!=k VAL [head={-4:0}] [L536] COND FALSE !(l!=((void *)0) && l->key!=k) [L539] return l; VAL [head={-4:0}] [L560] temp = search_list(head,2) [L561] temp->key [L14] COND TRUE !(cond) VAL [head={-4:0}] [L15] reach_error() VAL [head={-4:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 617459.52ms, OverallIterations: 9, TraceHistogramMax: 4, EmptinessCheckTime: 8.64ms, AutomataDifference: 3138.51ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 5.87ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 552 SdHoareTripleChecker+Valid, 1111.19ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 552 mSDsluCounter, 0 SdHoareTripleChecker+Invalid, 909.27ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 431 IncrementalHoareTripleChecker+Unchecked, 406 mSDsCounter, 313 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1640 IncrementalHoareTripleChecker+Invalid, 2384 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 313 mSolverCounterUnsat, 0 mSDtfsCounter, 1640 mSolverCounterSat, 16.62ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 420 GetRequests, 197 SyntacticMatches, 4 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1590 ImplicationChecksByTransitivity, 13728.30ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=8, InterpolantAutomatonStates: 96, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 48.55ms AutomataMinimizationTime, 8 MinimizatonAttempts, 22 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 75.91ms SsaConstructionTime, 560.79ms SatisfiabilityAnalysisTime, 607529.34ms InterpolantComputationTime, 325 NumberOfCodeBlocks, 325 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 381 ConstructedInterpolants, 21 QuantifiedInterpolants, 4889 SizeOfPredicates, 69 NumberOfNonLiveVariables, 842 ConjunctsInSsa, 163 ConjunctsInUnsatCore, 16 InterpolantComputations, 3 PerfectInterpolantSequences, 12/90 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-29 09:06:16,488 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...