./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/nested9.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/nested9.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b0874b2316aff3266709463f0d72702527bf3a82 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2021-10-11 02:30:10,293 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:30:10,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:30:10,330 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:30:10,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:30:10,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:30:10,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:30:10,337 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:30:10,339 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:30:10,341 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:30:10,342 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:30:10,344 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:30:10,344 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:30:10,346 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:30:10,347 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:30:10,349 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:30:10,350 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:30:10,351 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:30:10,353 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:30:10,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:30:10,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:30:10,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:30:10,362 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:30:10,363 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:30:10,366 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:30:10,367 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:30:10,367 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:30:10,369 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:30:10,369 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:30:10,371 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:30:10,371 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:30:10,377 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:30:10,378 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:30:10,380 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:30:10,381 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:30:10,381 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:30:10,382 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:30:10,383 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:30:10,383 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:30:10,385 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:30:10,386 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:30:10,387 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:30:10,415 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:30:10,415 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:30:10,416 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:30:10,416 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:30:10,417 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:30:10,417 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:30:10,417 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:30:10,417 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:30:10,418 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:30:10,418 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:30:10,418 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:30:10,418 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:30:10,419 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:30:10,419 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:30:10,419 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:30:10,420 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:30:10,420 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:30:10,421 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:30:10,421 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:30:10,421 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:30:10,421 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:30:10,422 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:30:10,422 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:30:10,422 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:30:10,422 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:30:10,423 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:30:10,423 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:30:10,423 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:30:10,423 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:30:10,424 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:30:10,424 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:30:10,424 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:30:10,424 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:30:10,425 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:30:10,425 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:30:10,425 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:30:10,425 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:30:10,426 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:30:10,426 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:30:10,426 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b0874b2316aff3266709463f0d72702527bf3a82 [2021-10-11 02:30:10,677 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:30:10,707 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:30:10,712 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:30:10,713 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:30:10,714 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:30:10,715 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/loop-invgen/nested9.i [2021-10-11 02:30:10,793 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/data/94492cea3/7f91faf10a3645b49593ba7a1e00ea0d/FLAG942552cc1 [2021-10-11 02:30:11,197 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:30:11,198 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/sv-benchmarks/c/loop-invgen/nested9.i [2021-10-11 02:30:11,204 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/data/94492cea3/7f91faf10a3645b49593ba7a1e00ea0d/FLAG942552cc1 [2021-10-11 02:30:11,612 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/data/94492cea3/7f91faf10a3645b49593ba7a1e00ea0d [2021-10-11 02:30:11,615 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:30:11,618 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:30:11,620 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:30:11,620 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:30:11,623 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:30:11,624 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,627 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57a2e83c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11, skipping insertion in model container [2021-10-11 02:30:11,627 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,634 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:30:11,651 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:30:11,821 WARN L226 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_5087573c-3806-4043-9c5b-e1bbcbddf629/sv-benchmarks/c/loop-invgen/nested9.i[893,906] [2021-10-11 02:30:11,835 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:30:11,844 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:30:11,855 WARN L226 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_5087573c-3806-4043-9c5b-e1bbcbddf629/sv-benchmarks/c/loop-invgen/nested9.i[893,906] [2021-10-11 02:30:11,861 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:30:11,876 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:30:11,877 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11 WrapperNode [2021-10-11 02:30:11,877 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:30:11,878 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:30:11,878 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:30:11,879 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:30:11,884 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,891 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,910 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:30:11,911 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:30:11,911 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:30:11,911 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:30:11,919 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,919 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,921 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,921 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,925 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,929 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,930 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... [2021-10-11 02:30:11,932 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:30:11,933 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:30:11,934 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:30:11,934 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:30:11,935 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:30:12,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:30:12,009 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:30:12,009 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:30:12,009 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:30:12,281 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:30:12,282 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-11 02:30:12,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:30:12 BoogieIcfgContainer [2021-10-11 02:30:12,284 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:30:12,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:30:12,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:30:12,303 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:30:12,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:30:11" (1/3) ... [2021-10-11 02:30:12,304 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ae059bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:30:12, skipping insertion in model container [2021-10-11 02:30:12,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:30:11" (2/3) ... [2021-10-11 02:30:12,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ae059bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:30:12, skipping insertion in model container [2021-10-11 02:30:12,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:30:12" (3/3) ... [2021-10-11 02:30:12,306 INFO L111 eAbstractionObserver]: Analyzing ICFG nested9.i [2021-10-11 02:30:12,337 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:30:12,339 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:30:12,360 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:30:12,407 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:30:12,407 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:30:12,407 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:30:12,407 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:30:12,407 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:30:12,407 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:30:12,408 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:30:12,408 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:30:12,420 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2021-10-11 02:30:12,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-11 02:30:12,425 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:12,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:12,427 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:12,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:12,431 INFO L82 PathProgramCache]: Analyzing trace with hash 262429726, now seen corresponding path program 1 times [2021-10-11 02:30:12,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:12,440 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715075352] [2021-10-11 02:30:12,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:12,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:12,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:12,670 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715075352] [2021-10-11 02:30:12,670 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:30:12,671 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-11 02:30:12,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962648990] [2021-10-11 02:30:12,675 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-10-11 02:30:12,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:12,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-11 02:30:12,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-11 02:30:12,692 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 6 states. [2021-10-11 02:30:12,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:12,826 INFO L93 Difference]: Finished difference Result 48 states and 69 transitions. [2021-10-11 02:30:12,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-11 02:30:12,828 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2021-10-11 02:30:12,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:12,837 INFO L225 Difference]: With dead ends: 48 [2021-10-11 02:30:12,837 INFO L226 Difference]: Without dead ends: 29 [2021-10-11 02:30:12,840 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-10-11 02:30:12,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-10-11 02:30:12,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 19. [2021-10-11 02:30:12,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-10-11 02:30:12,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2021-10-11 02:30:12,876 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 10 [2021-10-11 02:30:12,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:12,876 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2021-10-11 02:30:12,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-10-11 02:30:12,877 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2021-10-11 02:30:12,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-11 02:30:12,878 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:12,878 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:12,878 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:30:12,878 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:12,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:12,879 INFO L82 PathProgramCache]: Analyzing trace with hash -49415795, now seen corresponding path program 1 times [2021-10-11 02:30:12,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:12,880 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133850770] [2021-10-11 02:30:12,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:12,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:13,000 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133850770] [2021-10-11 02:30:13,001 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068350757] [2021-10-11 02:30:13,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:13,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:13,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-11 02:30:13,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:30:13,266 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-10-11 02:30:13,282 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-10-11 02:30:13,302 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-10-11 02:30:13,308 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-10-11 02:30:13,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:13,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:30:13,345 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2021-10-11 02:30:13,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:13,412 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-11 02:30:13,412 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 16 [2021-10-11 02:30:13,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286053575] [2021-10-11 02:30:13,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-10-11 02:30:13,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:13,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-11 02:30:13,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-10-11 02:30:13,416 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand 7 states. [2021-10-11 02:30:13,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:13,558 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2021-10-11 02:30:13,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:30:13,559 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2021-10-11 02:30:13,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:13,561 INFO L225 Difference]: With dead ends: 32 [2021-10-11 02:30:13,561 INFO L226 Difference]: Without dead ends: 30 [2021-10-11 02:30:13,563 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:30:13,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-10-11 02:30:13,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 14. [2021-10-11 02:30:13,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-10-11 02:30:13,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-10-11 02:30:13,577 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 12 [2021-10-11 02:30:13,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:13,578 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-10-11 02:30:13,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-10-11 02:30:13,578 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-10-11 02:30:13,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-11 02:30:13,579 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:13,579 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:13,794 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-10-11 02:30:13,794 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:13,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:13,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1208362450, now seen corresponding path program 1 times [2021-10-11 02:30:13,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:13,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550956277] [2021-10-11 02:30:13,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:13,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:13,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:13,892 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550956277] [2021-10-11 02:30:13,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267505985] [2021-10-11 02:30:13,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:13,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:13,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-11 02:30:13,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:30:13,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-11 02:30:13,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:30:13,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-11 02:30:13,998 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-11 02:30:13,998 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7] total 10 [2021-10-11 02:30:13,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722880387] [2021-10-11 02:30:13,999 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:30:13,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:13,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:30:14,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-10-11 02:30:14,000 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 5 states. [2021-10-11 02:30:14,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:14,025 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2021-10-11 02:30:14,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-11 02:30:14,025 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2021-10-11 02:30:14,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:14,026 INFO L225 Difference]: With dead ends: 25 [2021-10-11 02:30:14,027 INFO L226 Difference]: Without dead ends: 16 [2021-10-11 02:30:14,028 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-10-11 02:30:14,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-10-11 02:30:14,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-10-11 02:30:14,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-10-11 02:30:14,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-10-11 02:30:14,035 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2021-10-11 02:30:14,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:14,035 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-10-11 02:30:14,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:30:14,036 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-10-11 02:30:14,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-11 02:30:14,037 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:14,037 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:14,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:14,252 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:14,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:14,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1032707587, now seen corresponding path program 1 times [2021-10-11 02:30:14,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:14,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123997139] [2021-10-11 02:30:14,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:14,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:14,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123997139] [2021-10-11 02:30:14,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328469339] [2021-10-11 02:30:14,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:14,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:14,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:30:14,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:30:14,499 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:14,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:30:14,537 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:30:14,537 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570546474] [2021-10-11 02:30:14,558 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-11 02:30:14,558 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:30:14,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:30:14,572 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:30:14,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:30:15,208 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-11 02:30:15,373 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2021-10-11 02:30:15,510 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 55 [2021-10-11 02:30:15,660 WARN L197 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2021-10-11 02:30:15,811 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 56 [2021-10-11 02:30:15,994 WARN L197 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 54 [2021-10-11 02:30:16,238 WARN L197 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 46 [2021-10-11 02:30:16,599 WARN L197 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 64 [2021-10-11 02:30:16,742 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2021-10-11 02:30:16,906 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 48 [2021-10-11 02:30:17,071 WARN L197 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 49 [2021-10-11 02:30:17,078 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-11 02:30:17,078 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:30:17,078 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-10-11 02:30:17,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333974380] [2021-10-11 02:30:17,081 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-10-11 02:30:17,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:17,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-11 02:30:17,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-10-11 02:30:17,083 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 11 states. [2021-10-11 02:30:17,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:17,233 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-10-11 02:30:17,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:30:17,233 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2021-10-11 02:30:17,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:17,235 INFO L225 Difference]: With dead ends: 34 [2021-10-11 02:30:17,235 INFO L226 Difference]: Without dead ends: 25 [2021-10-11 02:30:17,236 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2021-10-11 02:30:17,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-11 02:30:17,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-10-11 02:30:17,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-10-11 02:30:17,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-10-11 02:30:17,246 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 15 [2021-10-11 02:30:17,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:17,247 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-10-11 02:30:17,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-10-11 02:30:17,247 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-10-11 02:30:17,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-11 02:30:17,248 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:17,248 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:17,459 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:17,459 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:17,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:17,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1079546391, now seen corresponding path program 1 times [2021-10-11 02:30:17,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:17,460 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936746760] [2021-10-11 02:30:17,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:17,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:17,556 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-11 02:30:17,556 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936746760] [2021-10-11 02:30:17,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430469904] [2021-10-11 02:30:17,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:17,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:17,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-11 02:30:17,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:30:17,703 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:30:17,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:30:17,751 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:30:17,751 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-11 02:30:17,751 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 13 [2021-10-11 02:30:17,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887309170] [2021-10-11 02:30:17,752 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-10-11 02:30:17,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:17,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-11 02:30:17,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-10-11 02:30:17,753 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand 6 states. [2021-10-11 02:30:17,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:17,810 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2021-10-11 02:30:17,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-11 02:30:17,811 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2021-10-11 02:30:17,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:17,812 INFO L225 Difference]: With dead ends: 38 [2021-10-11 02:30:17,812 INFO L226 Difference]: Without dead ends: 24 [2021-10-11 02:30:17,813 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:30:17,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-10-11 02:30:17,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-10-11 02:30:17,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-10-11 02:30:17,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-10-11 02:30:17,828 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 19 [2021-10-11 02:30:17,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:17,828 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-10-11 02:30:17,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-10-11 02:30:17,828 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-10-11 02:30:17,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-11 02:30:17,829 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:30:17,829 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:30:18,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:18,056 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:30:18,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:30:18,056 INFO L82 PathProgramCache]: Analyzing trace with hash 805943475, now seen corresponding path program 2 times [2021-10-11 02:30:18,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:30:18,057 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758575013] [2021-10-11 02:30:18,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:30:18,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:30:18,125 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:30:18,125 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758575013] [2021-10-11 02:30:18,125 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963083918] [2021-10-11 02:30:18,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:30:18,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-10-11 02:30:18,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:30:18,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:30:18,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:30:18,262 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-11 02:30:18,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:30:18,313 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-11 02:30:18,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1190874539] [2021-10-11 02:30:18,316 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-11 02:30:18,316 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:30:18,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:30:18,317 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:30:18,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:30:19,096 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:30:19,102 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:30:19,103 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 12 [2021-10-11 02:30:19,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933804022] [2021-10-11 02:30:19,106 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-10-11 02:30:19,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:30:19,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-11 02:30:19,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-11 02:30:19,107 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 12 states. [2021-10-11 02:30:19,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:30:19,266 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2021-10-11 02:30:19,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:30:19,267 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2021-10-11 02:30:19,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:30:19,267 INFO L225 Difference]: With dead ends: 39 [2021-10-11 02:30:19,267 INFO L226 Difference]: Without dead ends: 0 [2021-10-11 02:30:19,268 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2021-10-11 02:30:19,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-11 02:30:19,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-11 02:30:19,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-10-11 02:30:19,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-11 02:30:19,269 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2021-10-11 02:30:19,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:30:19,269 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-11 02:30:19,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-10-11 02:30:19,270 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-11 02:30:19,270 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-11 02:30:19,496 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-11 02:30:19,497 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-11 02:30:19,681 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 28 [2021-10-11 02:30:19,781 INFO L258 CegarLoopResult]: At program point L35-3(lines 35 37) the Hoare annotation is: (let ((.cse2 (* 2 ULTIMATE.start_main_~i~0))) (let ((.cse1 (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0)) (.cse0 (<= .cse2 ULTIMATE.start_main_~j~0))) (or (and .cse0 .cse1 (<= ULTIMATE.start_main_~i~0 1) (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0))) (and (<= ULTIMATE.start_main_~j~0 (+ (* 2 ULTIMATE.start_main_~n~0) ULTIMATE.start_main_~i~0 1)) .cse0 .cse1 (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) (<= 1 ULTIMATE.start_main_~i~0)) (and .cse0 (= ULTIMATE.start_main_~i~0 0) (<= (+ ULTIMATE.start_main_~i~0 1) ULTIMATE.start_main_~n~0) (<= ULTIMATE.start_main_~j~0 .cse2))))) [2021-10-11 02:30:19,781 INFO L262 CegarLoopResult]: For program point L31(line 31) no Hoare annotation was computed. [2021-10-11 02:30:19,781 INFO L262 CegarLoopResult]: For program point L19(line 19) no Hoare annotation was computed. [2021-10-11 02:30:19,781 INFO L258 CegarLoopResult]: At program point L36-2(lines 36 37) the Hoare annotation is: (let ((.cse0 (<= (* 2 ULTIMATE.start_main_~i~0) ULTIMATE.start_main_~j~0)) (.cse1 (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0)) (.cse2 (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0)))) (or (and .cse0 .cse1 (<= ULTIMATE.start_main_~k~0 (div ULTIMATE.start_main_~j~0 2)) (<= ULTIMATE.start_main_~i~0 1) .cse2 (<= (div (* ULTIMATE.start_main_~j~0 (- 1)) (- 2)) ULTIMATE.start_main_~k~0)) (and .cse0 .cse1 (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) .cse2))) [2021-10-11 02:30:19,781 INFO L262 CegarLoopResult]: For program point L32(line 32) no Hoare annotation was computed. [2021-10-11 02:30:19,781 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-11 02:30:19,781 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2021-10-11 02:30:19,782 INFO L262 CegarLoopResult]: For program point L33(line 33) no Hoare annotation was computed. [2021-10-11 02:30:19,782 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-11 02:30:19,782 INFO L265 CegarLoopResult]: At program point L38(lines 25 40) the Hoare annotation is: true [2021-10-11 02:30:19,782 INFO L258 CegarLoopResult]: At program point L34-3(lines 34 37) the Hoare annotation is: (let ((.cse3 (* 2 ULTIMATE.start_main_~i~0)) (.cse0 (* 2 ULTIMATE.start_main_~n~0))) (let ((.cse1 (<= .cse3 (+ .cse0 2))) (.cse2 (<= 1 ULTIMATE.start_main_~i~0))) (or (= ULTIMATE.start_main_~i~0 0) (and (<= ULTIMATE.start_main_~j~0 (+ .cse0 ULTIMATE.start_main_~i~0 1)) (<= 2 ULTIMATE.start_main_~n~0) .cse1 (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) .cse2) (and .cse1 (<= ULTIMATE.start_main_~i~0 1) .cse2 (<= ULTIMATE.start_main_~j~0 .cse3))))) [2021-10-11 02:30:19,782 INFO L262 CegarLoopResult]: For program point L30(line 30) no Hoare annotation was computed. [2021-10-11 02:30:19,782 INFO L262 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-10-11 02:30:19,782 INFO L258 CegarLoopResult]: At program point L18-2(lines 1 40) the Hoare annotation is: (and (<= (* 2 ULTIMATE.start_main_~i~0) ULTIMATE.start_main_~j~0) (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0) (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0))) [2021-10-11 02:30:19,782 INFO L265 CegarLoopResult]: At program point L39(lines 25 40) the Hoare annotation is: true [2021-10-11 02:30:19,800 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:30:19 BoogieIcfgContainer [2021-10-11 02:30:19,800 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:30:19,801 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:30:19,801 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:30:19,801 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:30:19,801 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:30:12" (3/4) ... [2021-10-11 02:30:19,804 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-11 02:30:19,812 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2021-10-11 02:30:19,813 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2021-10-11 02:30:19,813 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:30:19,813 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:30:19,858 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5087573c-3806-4043-9c5b-e1bbcbddf629/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:30:19,858 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:30:19,859 INFO L168 Benchmark]: Toolchain (without parser) took 8240.57 ms. Allocated memory was 88.1 MB in the beginning and 188.7 MB in the end (delta: 100.7 MB). Free memory was 52.0 MB in the beginning and 148.8 MB in the end (delta: -96.8 MB). Peak memory consumption was 4.8 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,860 INFO L168 Benchmark]: CDTParser took 1.10 ms. Allocated memory is still 88.1 MB. Free memory was 69.2 MB in the beginning and 69.1 MB in the end (delta: 68.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:30:19,860 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.38 ms. Allocated memory is still 88.1 MB. Free memory was 51.8 MB in the beginning and 64.9 MB in the end (delta: -13.0 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,860 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.84 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 63.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:30:19,861 INFO L168 Benchmark]: Boogie Preprocessor took 22.09 ms. Allocated memory is still 88.1 MB. Free memory was 63.3 MB in the beginning and 62.3 MB in the end (delta: 997.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,861 INFO L168 Benchmark]: RCFGBuilder took 351.21 ms. Allocated memory is still 88.1 MB. Free memory was 62.3 MB in the beginning and 45.1 MB in the end (delta: 17.2 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,862 INFO L168 Benchmark]: TraceAbstraction took 7513.95 ms. Allocated memory was 88.1 MB in the beginning and 188.7 MB in the end (delta: 100.7 MB). Free memory was 44.6 MB in the beginning and 151.9 MB in the end (delta: -107.3 MB). Peak memory consumption was 81.3 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,862 INFO L168 Benchmark]: Witness Printer took 57.44 ms. Allocated memory is still 188.7 MB. Free memory was 151.9 MB in the beginning and 148.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:30:19,865 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.10 ms. Allocated memory is still 88.1 MB. Free memory was 69.2 MB in the beginning and 69.1 MB in the end (delta: 68.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 257.38 ms. Allocated memory is still 88.1 MB. Free memory was 51.8 MB in the beginning and 64.9 MB in the end (delta: -13.0 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 31.84 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 63.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.09 ms. Allocated memory is still 88.1 MB. Free memory was 63.3 MB in the beginning and 62.3 MB in the end (delta: 997.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 351.21 ms. Allocated memory is still 88.1 MB. Free memory was 62.3 MB in the beginning and 45.1 MB in the end (delta: 17.2 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 7513.95 ms. Allocated memory was 88.1 MB in the beginning and 188.7 MB in the end (delta: 100.7 MB). Free memory was 44.6 MB in the beginning and 151.9 MB in the end (delta: -107.3 MB). Peak memory consumption was 81.3 MB. Max. memory is 16.1 GB. * Witness Printer took 57.44 ms. Allocated memory is still 188.7 MB. Free memory was 151.9 MB in the beginning and 148.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 34]: Loop Invariant Derived loop invariant: (i == 0 || ((((j <= 2 * n + i + 1 && 2 <= n) && 2 * i <= 2 * n + 2) && 1 <= cond) && 1 <= i)) || (((2 * i <= 2 * n + 2 && i <= 1) && 1 <= i) && j <= 2 * i) - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: ((2 * i <= j && i < n) && 1 <= cond) && j < 3 * i - InvariantResult [Line: 35]: Loop Invariant Derived loop invariant: ((((2 * i <= j && i < n) && i <= 1) && j < 3 * i) || ((((j <= 2 * n + i + 1 && 2 * i <= j) && i < n) && 1 <= cond) && 1 <= i)) || (((2 * i <= j && i == 0) && i + 1 <= n) && j <= 2 * i) - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: (((((2 * i <= j && i < n) && k <= j / 2) && i <= 1) && j < 3 * i) && j * -1 / -2 <= k) || (((2 * i <= j && i < n) && 1 <= cond) && j < 3 * i) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 15 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 7.1s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 70 SDtfs, 130 SDslu, 146 SDs, 0 SdLazy, 257 SolverSat, 59 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 226 GetRequests, 141 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=4, 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, 29 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 6 PreInvPairs, 27 NumberOfFragments, 178 HoareAnnotationTreeSize, 6 FomulaSimplifications, 1315 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 6 FomulaSimplificationsInter, 137 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 172 NumberOfCodeBlocks, 160 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 237 ConstructedInterpolants, 0 QuantifiedInterpolants, 11694 SizeOfPredicates, 21 NumberOfNonLiveVariables, 334 ConjunctsInSsa, 27 ConjunctsInUnsatCore, 16 InterpolantComputations, 5 PerfectInterpolantSequences, 88/120 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 correct! Received shutdown request...