./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/n.c11.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b2eff8ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/n.c11.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg --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 c22d07de108fc4801b9b7475bdc68ff9a5f4a90db882102d1715237a6b65777f ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-b2eff8b [2021-10-28 09:56:17,476 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-28 09:56:17,479 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-28 09:56:17,541 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-28 09:56:17,542 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-28 09:56:17,549 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-28 09:56:17,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-28 09:56:17,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-28 09:56:17,561 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-28 09:56:17,572 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-28 09:56:17,573 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-28 09:56:17,576 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-28 09:56:17,577 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-28 09:56:17,581 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-28 09:56:17,585 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-28 09:56:17,595 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-28 09:56:17,598 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-28 09:56:17,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-28 09:56:17,603 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-28 09:56:17,609 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-28 09:56:17,615 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-28 09:56:17,617 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-28 09:56:17,621 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-28 09:56:17,623 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-28 09:56:17,631 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-28 09:56:17,632 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-28 09:56:17,633 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-28 09:56:17,636 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-28 09:56:17,636 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-28 09:56:17,638 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-28 09:56:17,640 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-28 09:56:17,641 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-28 09:56:17,644 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-28 09:56:17,645 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-28 09:56:17,646 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-28 09:56:17,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-28 09:56:17,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-28 09:56:17,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-28 09:56:17,648 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-28 09:56:17,650 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-28 09:56:17,651 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-28 09:56:17,652 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-10-28 09:56:17,714 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-28 09:56:17,715 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-28 09:56:17,716 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-28 09:56:17,716 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-28 09:56:17,721 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-28 09:56:17,722 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-28 09:56:17,722 INFO L138 SettingsManager]: * Use SBE=true [2021-10-28 09:56:17,722 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-28 09:56:17,723 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-28 09:56:17,723 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-28 09:56:17,723 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-28 09:56:17,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-28 09:56:17,724 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-28 09:56:17,724 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-28 09:56:17,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-28 09:56:17,724 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-28 09:56:17,725 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-28 09:56:17,725 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-28 09:56:17,725 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-28 09:56:17,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-28 09:56:17,726 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-28 09:56:17,726 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-28 09:56:17,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 09:56:17,727 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-28 09:56:17,727 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-28 09:56:17,727 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-28 09:56:17,728 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-28 09:56:17,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-28 09:56:17,728 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-10-28 09:56:17,728 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-10-28 09:56:17,729 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-28 09:56:17,729 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-28 09:56:17,729 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c22d07de108fc4801b9b7475bdc68ff9a5f4a90db882102d1715237a6b65777f [2021-10-28 09:56:18,139 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-28 09:56:18,182 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-28 09:56:18,185 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-28 09:56:18,187 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-28 09:56:18,188 INFO L275 PluginConnector]: CDTParser initialized [2021-10-28 09:56:18,189 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/../../sv-benchmarks/c/loops/n.c11.c [2021-10-28 09:56:18,258 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/data/0fd006218/c254da132a444067806c91c5f5d30f32/FLAGfbec2b417 [2021-10-28 09:56:18,834 INFO L306 CDTParser]: Found 1 translation units. [2021-10-28 09:56:18,834 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/sv-benchmarks/c/loops/n.c11.c [2021-10-28 09:56:18,842 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/data/0fd006218/c254da132a444067806c91c5f5d30f32/FLAGfbec2b417 [2021-10-28 09:56:19,210 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/data/0fd006218/c254da132a444067806c91c5f5d30f32 [2021-10-28 09:56:19,224 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-28 09:56:19,226 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-28 09:56:19,239 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-28 09:56:19,239 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-28 09:56:19,244 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-28 09:56:19,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,246 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75e710ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19, skipping insertion in model container [2021-10-28 09:56:19,247 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,256 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-28 09:56:19,293 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-28 09:56:19,497 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/sv-benchmarks/c/loops/n.c11.c[317,330] [2021-10-28 09:56:19,522 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 09:56:19,535 INFO L203 MainTranslator]: Completed pre-run [2021-10-28 09:56:19,560 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/sv-benchmarks/c/loops/n.c11.c[317,330] [2021-10-28 09:56:19,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 09:56:19,586 INFO L208 MainTranslator]: Completed translation [2021-10-28 09:56:19,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19 WrapperNode [2021-10-28 09:56:19,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-28 09:56:19,589 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-28 09:56:19,589 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-28 09:56:19,589 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-28 09:56:19,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,609 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,633 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-28 09:56:19,634 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-28 09:56:19,634 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-28 09:56:19,635 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-28 09:56:19,645 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,659 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,664 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,675 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,677 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,680 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-28 09:56:19,684 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-28 09:56:19,684 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-28 09:56:19,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-28 09:56:19,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (1/1) ... [2021-10-28 09:56:19,697 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 09:56:19,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:56:19,726 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-28 09:56:19,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-28 09:56:19,788 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-28 09:56:19,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-28 09:56:19,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-28 09:56:19,789 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-28 09:56:20,015 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-28 09:56:20,015 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-10-28 09:56:20,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:56:20 BoogieIcfgContainer [2021-10-28 09:56:20,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-28 09:56:20,020 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-28 09:56:20,020 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-28 09:56:20,025 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-28 09:56:20,025 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 09:56:19" (1/3) ... [2021-10-28 09:56:20,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47a8e6c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 09:56:20, skipping insertion in model container [2021-10-28 09:56:20,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:56:19" (2/3) ... [2021-10-28 09:56:20,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47a8e6c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 09:56:20, skipping insertion in model container [2021-10-28 09:56:20,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:56:20" (3/3) ... [2021-10-28 09:56:20,029 INFO L111 eAbstractionObserver]: Analyzing ICFG n.c11.c [2021-10-28 09:56:20,036 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-28 09:56:20,037 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-28 09:56:20,095 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-28 09:56:20,104 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, 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 [2021-10-28 09:56:20,105 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-28 09:56:20,122 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:20,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-28 09:56:20,129 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:20,130 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-28 09:56:20,131 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:20,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:20,138 INFO L85 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2021-10-28 09:56:20,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:20,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472236354] [2021-10-28 09:56:20,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:20,168 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:20,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:20,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:20,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:20,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472236354] [2021-10-28 09:56:20,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472236354] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:56:20,379 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:56:20,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-28 09:56:20,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220893845] [2021-10-28 09:56:20,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-28 09:56:20,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:20,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-28 09:56:20,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-28 09:56:20,432 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2021-10-28 09:56:20,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:20,448 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2021-10-28 09:56:20,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-28 09:56:20,450 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 6 [2021-10-28 09:56:20,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:20,460 INFO L225 Difference]: With dead ends: 21 [2021-10-28 09:56:20,461 INFO L226 Difference]: Without dead ends: 9 [2021-10-28 09:56:20,464 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-28 09:56:20,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-10-28 09:56:20,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-10-28 09:56:20,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:20,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-10-28 09:56:20,503 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-10-28 09:56:20,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:20,503 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-10-28 09:56:20,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2021-10-28 09:56:20,504 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-10-28 09:56:20,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-28 09:56:20,504 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:20,505 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-28 09:56:20,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-28 09:56:20,505 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:20,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:20,506 INFO L85 PathProgramCache]: Analyzing trace with hash 889640786, now seen corresponding path program 1 times [2021-10-28 09:56:20,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:20,507 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791985479] [2021-10-28 09:56:20,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:20,508 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:20,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:20,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791985479] [2021-10-28 09:56:20,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791985479] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:56:20,688 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:56:20,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 09:56:20,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272955634] [2021-10-28 09:56:20,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 09:56:20,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:20,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 09:56:20,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 09:56:20,695 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2021-10-28 09:56:20,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:20,753 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2021-10-28 09:56:20,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 09:56:20,754 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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 6 [2021-10-28 09:56:20,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:20,755 INFO L225 Difference]: With dead ends: 21 [2021-10-28 09:56:20,755 INFO L226 Difference]: Without dead ends: 12 [2021-10-28 09:56:20,756 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-28 09:56:20,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-10-28 09:56:20,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2021-10-28 09:56:20,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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) [2021-10-28 09:56:20,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-10-28 09:56:20,761 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2021-10-28 09:56:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:20,762 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-10-28 09:56:20,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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) [2021-10-28 09:56:20,763 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-10-28 09:56:20,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-28 09:56:20,764 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:20,764 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:56:20,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-28 09:56:20,765 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:20,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:20,766 INFO L85 PathProgramCache]: Analyzing trace with hash 641725625, now seen corresponding path program 1 times [2021-10-28 09:56:20,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:20,767 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975269918] [2021-10-28 09:56:20,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:20,768 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:20,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:20,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:20,960 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:20,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975269918] [2021-10-28 09:56:20,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975269918] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:20,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920758227] [2021-10-28 09:56:20,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:20,968 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:20,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:56:20,973 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 09:56:20,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-28 09:56:21,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:21,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-28 09:56:21,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 09:56:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:21,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920758227] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:21,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 09:56:21,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-10-28 09:56:21,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904183141] [2021-10-28 09:56:21,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 09:56:21,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:21,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 09:56:21,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-28 09:56:21,176 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2021-10-28 09:56:21,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:21,235 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-10-28 09:56:21,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 09:56:21,237 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-10-28 09:56:21,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:21,240 INFO L225 Difference]: With dead ends: 24 [2021-10-28 09:56:21,240 INFO L226 Difference]: Without dead ends: 15 [2021-10-28 09:56:21,242 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-10-28 09:56:21,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-10-28 09:56:21,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-10-28 09:56:21,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:21,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-10-28 09:56:21,249 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-10-28 09:56:21,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:21,250 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-10-28 09:56:21,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2021-10-28 09:56:21,251 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-10-28 09:56:21,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-28 09:56:21,252 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:21,252 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-28 09:56:21,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-28 09:56:21,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-28 09:56:21,465 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:21,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:21,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1950053902, now seen corresponding path program 2 times [2021-10-28 09:56:21,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:21,466 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626351060] [2021-10-28 09:56:21,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:21,467 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:21,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:21,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:21,684 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:21,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626351060] [2021-10-28 09:56:21,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626351060] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:21,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497166135] [2021-10-28 09:56:21,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 09:56:21,686 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:21,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:56:21,691 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 09:56:21,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-28 09:56:21,771 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 09:56:21,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 09:56:21,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-28 09:56:21,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 09:56:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:22,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497166135] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:22,029 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 09:56:22,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-10-28 09:56:22,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382130828] [2021-10-28 09:56:22,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-28 09:56:22,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:22,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-28 09:56:22,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-28 09:56:22,034 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:22,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:22,109 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-10-28 09:56:22,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 09:56:22,110 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-10-28 09:56:22,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:22,113 INFO L225 Difference]: With dead ends: 30 [2021-10-28 09:56:22,113 INFO L226 Difference]: Without dead ends: 18 [2021-10-28 09:56:22,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-28 09:56:22,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-10-28 09:56:22,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-10-28 09:56:22,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:22,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-10-28 09:56:22,119 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2021-10-28 09:56:22,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:22,119 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-10-28 09:56:22,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 09:56:22,120 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-10-28 09:56:22,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-28 09:56:22,121 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:22,121 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-10-28 09:56:22,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-28 09:56:22,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:22,338 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:22,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:22,339 INFO L85 PathProgramCache]: Analyzing trace with hash 1268104729, now seen corresponding path program 3 times [2021-10-28 09:56:22,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:22,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468534795] [2021-10-28 09:56:22,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:22,340 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:22,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:22,546 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:22,546 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:22,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468534795] [2021-10-28 09:56:22,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468534795] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:22,547 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795819664] [2021-10-28 09:56:22,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-28 09:56:22,547 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:22,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:56:22,551 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 09:56:22,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-28 09:56:22,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-28 09:56:22,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 09:56:22,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-28 09:56:22,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 09:56:22,868 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:22,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795819664] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:22,869 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 09:56:22,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-10-28 09:56:22,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155150329] [2021-10-28 09:56:22,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 09:56:22,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:22,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 09:56:22,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-10-28 09:56:22,872 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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) [2021-10-28 09:56:22,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:22,965 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-10-28 09:56:22,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-28 09:56:22,966 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 15 [2021-10-28 09:56:22,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:22,967 INFO L225 Difference]: With dead ends: 36 [2021-10-28 09:56:22,967 INFO L226 Difference]: Without dead ends: 21 [2021-10-28 09:56:22,968 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-10-28 09:56:22,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-28 09:56:22,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-10-28 09:56:22,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 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) [2021-10-28 09:56:22,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-10-28 09:56:22,973 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2021-10-28 09:56:22,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:22,973 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-10-28 09:56:22,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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) [2021-10-28 09:56:22,974 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-10-28 09:56:22,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-28 09:56:22,975 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:56:22,975 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2021-10-28 09:56:23,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-28 09:56:23,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:23,190 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-28 09:56:23,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:56:23,191 INFO L85 PathProgramCache]: Analyzing trace with hash 1171899538, now seen corresponding path program 4 times [2021-10-28 09:56:23,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:56:23,192 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186376123] [2021-10-28 09:56:23,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:56:23,192 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:56:23,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:56:23,350 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:23,351 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:56:23,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186376123] [2021-10-28 09:56:23,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186376123] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:23,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804396585] [2021-10-28 09:56:23,353 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-28 09:56:23,353 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:56:23,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:56:23,354 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 09:56:23,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-28 09:56:23,425 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-28 09:56:23,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 09:56:23,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-28 09:56:23,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 09:56:23,667 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:56:23,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804396585] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:56:23,668 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 09:56:23,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-10-28 09:56:23,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220811883] [2021-10-28 09:56:23,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-28 09:56:23,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:56:23,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-28 09:56:23,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-10-28 09:56:23,671 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 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) [2021-10-28 09:56:23,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:56:23,745 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-10-28 09:56:23,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 09:56:23,746 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-10-28 09:56:23,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:56:23,747 INFO L225 Difference]: With dead ends: 34 [2021-10-28 09:56:23,747 INFO L226 Difference]: Without dead ends: 0 [2021-10-28 09:56:23,748 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-10-28 09:56:23,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-28 09:56:23,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-28 09:56:23,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-10-28 09:56:23,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-28 09:56:23,749 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2021-10-28 09:56:23,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:56:23,749 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-28 09:56:23,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 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) [2021-10-28 09:56:23,750 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-28 09:56:23,750 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-28 09:56:23,753 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-28 09:56:23,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-28 09:56:23,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-10-28 09:56:23,964 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-28 09:56:23,968 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-28 09:56:23,970 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-28 09:56:23,983 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-28 09:56:24,048 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-28 09:56:24,048 INFO L860 garLoopResultBuilder]: At program point L31(lines 14 34) the Hoare annotation is: true [2021-10-28 09:56:24,048 INFO L857 garLoopResultBuilder]: For program point L23(lines 23 24) no Hoare annotation was computed. [2021-10-28 09:56:24,049 INFO L857 garLoopResultBuilder]: For program point L23-2(lines 23 24) no Hoare annotation was computed. [2021-10-28 09:56:24,049 INFO L853 garLoopResultBuilder]: At program point L21-2(lines 21 29) the Hoare annotation is: (or (= ULTIMATE.start_main_~len~0 0) (and (<= ULTIMATE.start_main_~len~0 1) (<= 1 ULTIMATE.start_main_~len~0)) (and (<= ULTIMATE.start_main_~len~0 2) (<= 2 ULTIMATE.start_main_~len~0)) (and (<= 4 ULTIMATE.start_main_~len~0) (<= ULTIMATE.start_main_~len~0 4)) (and (<= 3 ULTIMATE.start_main_~len~0) (<= ULTIMATE.start_main_~len~0 3))) [2021-10-28 09:56:24,049 INFO L857 garLoopResultBuilder]: For program point L21-3(lines 21 29) no Hoare annotation was computed. [2021-10-28 09:56:24,050 INFO L857 garLoopResultBuilder]: For program point L7(line 7) no Hoare annotation was computed. [2021-10-28 09:56:24,054 INFO L857 garLoopResultBuilder]: For program point L-1(line -1) no Hoare annotation was computed. [2021-10-28 09:56:24,054 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-28 09:56:24,054 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-10-28 09:56:24,055 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) no Hoare annotation was computed. [2021-10-28 09:56:24,055 INFO L857 garLoopResultBuilder]: For program point L6(lines 6 8) no Hoare annotation was computed. [2021-10-28 09:56:24,055 INFO L860 garLoopResultBuilder]: At program point L6-2(lines 5 10) the Hoare annotation is: true [2021-10-28 09:56:24,059 INFO L731 BasicCegarLoop]: Path program histogram: [4, 1, 1] [2021-10-28 09:56:24,061 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-28 09:56:24,084 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 09:56:24 BoogieIcfgContainer [2021-10-28 09:56:24,085 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-28 09:56:24,090 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-28 09:56:24,091 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-28 09:56:24,091 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-28 09:56:24,091 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:56:20" (3/4) ... [2021-10-28 09:56:24,095 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-28 09:56:24,112 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2021-10-28 09:56:24,112 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-10-28 09:56:24,113 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-28 09:56:24,114 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-28 09:56:24,148 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/witness.graphml [2021-10-28 09:56:24,148 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-28 09:56:24,150 INFO L168 Benchmark]: Toolchain (without parser) took 4923.47 ms. Allocated memory was 81.8 MB in the beginning and 102.8 MB in the end (delta: 21.0 MB). Free memory was 61.7 MB in the beginning and 59.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 22.2 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,151 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 81.8 MB. Free memory is still 58.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-28 09:56:24,151 INFO L168 Benchmark]: CACSL2BoogieTranslator took 349.24 ms. Allocated memory is still 81.8 MB. Free memory was 61.5 MB in the beginning and 52.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,152 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.29 ms. Allocated memory is still 81.8 MB. Free memory was 52.1 MB in the beginning and 50.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,152 INFO L168 Benchmark]: Boogie Preprocessor took 47.08 ms. Allocated memory is still 81.8 MB. Free memory was 50.7 MB in the beginning and 49.8 MB in the end (delta: 925.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-28 09:56:24,153 INFO L168 Benchmark]: RCFGBuilder took 334.28 ms. Allocated memory is still 81.8 MB. Free memory was 49.6 MB in the beginning and 40.9 MB in the end (delta: 8.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,153 INFO L168 Benchmark]: TraceAbstraction took 4064.87 ms. Allocated memory was 81.8 MB in the beginning and 102.8 MB in the end (delta: 21.0 MB). Free memory was 40.3 MB in the beginning and 61.3 MB in the end (delta: -21.0 MB). Peak memory consumption was 1.3 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,154 INFO L168 Benchmark]: Witness Printer took 57.96 ms. Allocated memory is still 102.8 MB. Free memory was 61.3 MB in the beginning and 59.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 09:56:24,157 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 81.8 MB. Free memory is still 58.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 349.24 ms. Allocated memory is still 81.8 MB. Free memory was 61.5 MB in the beginning and 52.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 44.29 ms. Allocated memory is still 81.8 MB. Free memory was 52.1 MB in the beginning and 50.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 47.08 ms. Allocated memory is still 81.8 MB. Free memory was 50.7 MB in the beginning and 49.8 MB in the end (delta: 925.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 334.28 ms. Allocated memory is still 81.8 MB. Free memory was 49.6 MB in the beginning and 40.9 MB in the end (delta: 8.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4064.87 ms. Allocated memory was 81.8 MB in the beginning and 102.8 MB in the end (delta: 21.0 MB). Free memory was 40.3 MB in the beginning and 61.3 MB in the end (delta: -21.0 MB). Peak memory consumption was 1.3 MB. Max. memory is 16.1 GB. * Witness Printer took 57.96 ms. Allocated memory is still 102.8 MB. Free memory was 61.3 MB in the beginning and 59.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.9s, OverallIterations: 6, TraceHistogramMax: 4, PathProgramHistogramMax: 4, EmptinessCheckTime: 0.0s, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 56 SDtfs, 39 SDslu, 131 SDs, 0 SdLazy, 187 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 87 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred in iteration=5, InterpolantAutomatonStates: 32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 4 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 10 NumberOfFragments, 34 HoareAnnotationTreeSize, 3 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 120 NumberOfCodeBlocks, 120 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 110 ConstructedInterpolants, 0 QuantifiedInterpolants, 521 SizeOfPredicates, 8 NumberOfNonLiveVariables, 218 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 10 InterpolantComputations, 2 PerfectInterpolantSequences, 0/80 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: (((len == 0 || (len <= 1 && 1 <= len)) || (len <= 2 && 2 <= len)) || (4 <= len && len <= 4)) || (3 <= len && len <= 3) - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2021-10-28 09:56:24,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51339886-77f9-4783-b73f-57c24a2d7b0e/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...