./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_7_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_7_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f612eebc128d68e9b4bc81ed92184f640c3b9bd4 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-08 16:27:47,886 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-08 16:27:47,887 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-08 16:27:47,893 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-08 16:27:47,893 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-08 16:27:47,894 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-08 16:27:47,895 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-08 16:27:47,895 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-08 16:27:47,896 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-08 16:27:47,897 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-08 16:27:47,897 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-08 16:27:47,897 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-08 16:27:47,898 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-08 16:27:47,898 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-08 16:27:47,899 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-08 16:27:47,899 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-08 16:27:47,900 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-08 16:27:47,900 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-08 16:27:47,901 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-08 16:27:47,902 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-08 16:27:47,903 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-08 16:27:47,903 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-08 16:27:47,904 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-08 16:27:47,904 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-08 16:27:47,904 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-08 16:27:47,905 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-08 16:27:47,905 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-08 16:27:47,906 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-08 16:27:47,906 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-08 16:27:47,907 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-08 16:27:47,907 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-08 16:27:47,907 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-08 16:27:47,907 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-08 16:27:47,907 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-08 16:27:47,908 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-08 16:27:47,908 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-08 16:27:47,908 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-08 16:27:47,915 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-08 16:27:47,916 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-08 16:27:47,916 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-08 16:27:47,916 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-08 16:27:47,916 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-08 16:27:47,916 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-08 16:27:47,916 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-08 16:27:47,916 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-08 16:27:47,917 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-08 16:27:47,917 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-08 16:27:47,918 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-08 16:27:47,918 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-08 16:27:47,919 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-08 16:27:47,919 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan 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(__VERIFIER_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 -> f612eebc128d68e9b4bc81ed92184f640c3b9bd4 [2018-12-08 16:27:47,936 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-08 16:27:47,944 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-08 16:27:47,947 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-08 16:27:47,948 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-08 16:27:47,948 INFO L276 PluginConnector]: CDTParser initialized [2018-12-08 16:27:47,949 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_7_true-unreach-call_true-termination.c [2018-12-08 16:27:47,992 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/data/27fc7d44a/f8910f26ecb34f528d910f1e6a1bfc08/FLAG6c4aa13c9 [2018-12-08 16:27:48,315 INFO L307 CDTParser]: Found 1 translation units. [2018-12-08 16:27:48,315 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/sv-benchmarks/c/recursive-simple/fibo_7_true-unreach-call_true-termination.c [2018-12-08 16:27:48,319 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/data/27fc7d44a/f8910f26ecb34f528d910f1e6a1bfc08/FLAG6c4aa13c9 [2018-12-08 16:27:48,327 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/data/27fc7d44a/f8910f26ecb34f528d910f1e6a1bfc08 [2018-12-08 16:27:48,328 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-08 16:27:48,329 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-08 16:27:48,330 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-08 16:27:48,330 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-08 16:27:48,332 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-08 16:27:48,332 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@489644d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48, skipping insertion in model container [2018-12-08 16:27:48,334 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,338 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-08 16:27:48,346 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-08 16:27:48,426 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:27:48,428 INFO L191 MainTranslator]: Completed pre-run [2018-12-08 16:27:48,436 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:27:48,444 INFO L195 MainTranslator]: Completed translation [2018-12-08 16:27:48,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48 WrapperNode [2018-12-08 16:27:48,444 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-08 16:27:48,444 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-08 16:27:48,445 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-08 16:27:48,445 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-08 16:27:48,449 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,452 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,456 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-08 16:27:48,456 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-08 16:27:48,456 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-08 16:27:48,456 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-08 16:27:48,462 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,462 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,462 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,462 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,464 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,465 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,466 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... [2018-12-08 16:27:48,467 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-08 16:27:48,467 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-08 16:27:48,467 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-08 16:27:48,467 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-08 16:27:48,467 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/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 [2018-12-08 16:27:48,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-08 16:27:48,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-08 16:27:48,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-08 16:27:48,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-08 16:27:48,529 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-08 16:27:48,529 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-08 16:27:48,530 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2018-12-08 16:27:48,530 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2018-12-08 16:27:48,616 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-08 16:27:48,616 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-08 16:27:48,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:27:48 BoogieIcfgContainer [2018-12-08 16:27:48,617 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-08 16:27:48,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-08 16:27:48,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-08 16:27:48,620 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-08 16:27:48,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 08.12 04:27:48" (1/3) ... [2018-12-08 16:27:48,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54675e95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:27:48, skipping insertion in model container [2018-12-08 16:27:48,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:27:48" (2/3) ... [2018-12-08 16:27:48,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54675e95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:27:48, skipping insertion in model container [2018-12-08 16:27:48,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:27:48" (3/3) ... [2018-12-08 16:27:48,623 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_7_true-unreach-call_true-termination.c [2018-12-08 16:27:48,632 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-08 16:27:48,638 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-08 16:27:48,648 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-08 16:27:48,671 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-08 16:27:48,671 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-08 16:27:48,671 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-08 16:27:48,671 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-08 16:27:48,671 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-08 16:27:48,671 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-08 16:27:48,671 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-08 16:27:48,671 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-08 16:27:48,685 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-12-08 16:27:48,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-08 16:27:48,689 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:48,690 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:48,692 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:48,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:48,696 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2018-12-08 16:27:48,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:48,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:48,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:48,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:27:48,800 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:27:48,800 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-08 16:27:48,800 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-08 16:27:48,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-08 16:27:48,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-08 16:27:48,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-08 16:27:48,812 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2018-12-08 16:27:48,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:48,858 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-12-08 16:27:48,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-08 16:27:48,859 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-08 16:27:48,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:48,865 INFO L225 Difference]: With dead ends: 35 [2018-12-08 16:27:48,865 INFO L226 Difference]: Without dead ends: 21 [2018-12-08 16:27:48,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:27:48,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-08 16:27:48,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-08 16:27:48,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-08 16:27:48,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2018-12-08 16:27:48,891 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2018-12-08 16:27:48,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:48,891 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2018-12-08 16:27:48,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-08 16:27:48,892 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2018-12-08 16:27:48,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-08 16:27:48,893 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:48,893 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:48,893 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:48,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:48,893 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2018-12-08 16:27:48,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:48,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:48,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,894 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:48,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:48,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:27:48,916 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:27:48,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-08 16:27:48,916 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-08 16:27:48,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-08 16:27:48,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-08 16:27:48,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-08 16:27:48,917 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2018-12-08 16:27:48,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:48,948 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2018-12-08 16:27:48,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-08 16:27:48,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-12-08 16:27:48,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:48,950 INFO L225 Difference]: With dead ends: 27 [2018-12-08 16:27:48,950 INFO L226 Difference]: Without dead ends: 23 [2018-12-08 16:27:48,951 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:27:48,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-08 16:27:48,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2018-12-08 16:27:48,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-08 16:27:48,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2018-12-08 16:27:48,955 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2018-12-08 16:27:48,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:48,956 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2018-12-08 16:27:48,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-08 16:27:48,956 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2018-12-08 16:27:48,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-08 16:27:48,957 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:48,957 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:48,957 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:48,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:48,957 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2018-12-08 16:27:48,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:48,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:48,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:48,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:48,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:49,009 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-08 16:27:49,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:49,009 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:49,009 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2018-12-08 16:27:49,010 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [33], [34], [36], [37], [38], [39], [40], [41] [2018-12-08 16:27:49,031 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-08 16:27:49,031 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-08 16:27:49,174 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-08 16:27:49,175 INFO L272 AbstractInterpreter]: Visited 17 different actions 190 times. Never merged. Widened at 1 different actions 10 times. Performed 398 root evaluator evaluations with a maximum evaluation depth of 3. Performed 398 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 14 fixpoints after 3 different actions. Largest state had 5 variables. [2018-12-08 16:27:49,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:49,180 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-08 16:27:49,203 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2018-12-08 16:27:49,203 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-08 16:27:49,223 INFO L418 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2018-12-08 16:27:49,224 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-08 16:27:49,224 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-08 16:27:49,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-12-08 16:27:49,224 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-08 16:27:49,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-08 16:27:49,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-08 16:27:49,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-12-08 16:27:49,225 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 7 states. [2018-12-08 16:27:49,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:49,337 INFO L93 Difference]: Finished difference Result 54 states and 72 transitions. [2018-12-08 16:27:49,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-08 16:27:49,337 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-12-08 16:27:49,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:49,338 INFO L225 Difference]: With dead ends: 54 [2018-12-08 16:27:49,338 INFO L226 Difference]: Without dead ends: 39 [2018-12-08 16:27:49,339 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2018-12-08 16:27:49,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-08 16:27:49,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-12-08 16:27:49,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-08 16:27:49,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2018-12-08 16:27:49,343 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 26 [2018-12-08 16:27:49,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:49,344 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2018-12-08 16:27:49,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-08 16:27:49,344 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2018-12-08 16:27:49,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-08 16:27:49,344 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:49,345 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:49,345 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:49,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:49,345 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2018-12-08 16:27:49,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:49,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:49,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:49,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:49,346 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:49,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:49,381 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-12-08 16:27:49,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:49,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:49,382 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:49,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:49,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:49,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:49,388 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 16:27:49,389 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 16:27:49,398 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-08 16:27:49,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:49,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:49,436 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-12-08 16:27:49,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-08 16:27:49,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:49,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2018-12-08 16:27:49,563 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:49,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 16:27:49,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 16:27:49,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-12-08 16:27:49,564 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 8 states. [2018-12-08 16:27:49,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:49,639 INFO L93 Difference]: Finished difference Result 73 states and 99 transitions. [2018-12-08 16:27:49,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-08 16:27:49,639 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-12-08 16:27:49,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:49,641 INFO L225 Difference]: With dead ends: 73 [2018-12-08 16:27:49,641 INFO L226 Difference]: Without dead ends: 47 [2018-12-08 16:27:49,641 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2018-12-08 16:27:49,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-12-08 16:27:49,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2018-12-08 16:27:49,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-08 16:27:49,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2018-12-08 16:27:49,647 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 39 [2018-12-08 16:27:49,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:49,647 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2018-12-08 16:27:49,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 16:27:49,647 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2018-12-08 16:27:49,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-08 16:27:49,648 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:49,648 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:49,648 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:49,649 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:49,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 1 times [2018-12-08 16:27:49,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:49,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:49,650 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:27:49,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:49,650 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:49,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:49,686 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-12-08 16:27:49,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:49,686 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:49,686 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 42 with the following transitions: [2018-12-08 16:27:49,687 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [33], [34], [36], [37], [38], [39], [40], [41] [2018-12-08 16:27:49,687 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-08 16:27:49,688 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-08 16:27:50,264 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-08 16:27:50,264 INFO L272 AbstractInterpreter]: Visited 22 different actions 3039 times. Merged at 10 different actions 717 times. Widened at 1 different actions 56 times. Performed 7779 root evaluator evaluations with a maximum evaluation depth of 3. Performed 7779 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 170 fixpoints after 5 different actions. Largest state had 5 variables. [2018-12-08 16:27:50,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:50,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-08 16:27:50,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:50,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:50,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:50,274 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 16:27:50,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:50,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:50,297 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-12-08 16:27:50,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:50,460 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2018-12-08 16:27:50,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:50,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 9] total 11 [2018-12-08 16:27:50,474 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:50,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-08 16:27:50,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-08 16:27:50,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-08 16:27:50,475 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 7 states. [2018-12-08 16:27:50,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:50,518 INFO L93 Difference]: Finished difference Result 70 states and 111 transitions. [2018-12-08 16:27:50,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-08 16:27:50,518 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2018-12-08 16:27:50,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:50,519 INFO L225 Difference]: With dead ends: 70 [2018-12-08 16:27:50,520 INFO L226 Difference]: Without dead ends: 56 [2018-12-08 16:27:50,520 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-08 16:27:50,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-12-08 16:27:50,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 41. [2018-12-08 16:27:50,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-08 16:27:50,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2018-12-08 16:27:50,526 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 41 [2018-12-08 16:27:50,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:50,526 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2018-12-08 16:27:50,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-08 16:27:50,526 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2018-12-08 16:27:50,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-08 16:27:50,527 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:50,527 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:50,527 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:50,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:50,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1437629917, now seen corresponding path program 2 times [2018-12-08 16:27:50,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:50,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:50,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:50,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:50,528 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:50,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 47 proven. 43 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2018-12-08 16:27:50,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:50,616 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:50,616 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:50,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:50,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:50,616 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:50,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 16:27:50,622 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 16:27:50,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-08 16:27:50,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:50,634 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:50,675 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 64 proven. 24 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2018-12-08 16:27:50,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 66 proven. 29 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-12-08 16:27:50,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:50,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 9] total 17 [2018-12-08 16:27:50,852 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:50,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-08 16:27:50,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-08 16:27:50,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2018-12-08 16:27:50,853 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 13 states. [2018-12-08 16:27:51,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:51,061 INFO L93 Difference]: Finished difference Result 98 states and 144 transitions. [2018-12-08 16:27:51,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-08 16:27:51,061 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 67 [2018-12-08 16:27:51,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:51,062 INFO L225 Difference]: With dead ends: 98 [2018-12-08 16:27:51,062 INFO L226 Difference]: Without dead ends: 68 [2018-12-08 16:27:51,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 121 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=216, Invalid=596, Unknown=0, NotChecked=0, Total=812 [2018-12-08 16:27:51,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-08 16:27:51,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2018-12-08 16:27:51,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-08 16:27:51,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 79 transitions. [2018-12-08 16:27:51,071 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 79 transitions. Word has length 67 [2018-12-08 16:27:51,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:51,071 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 79 transitions. [2018-12-08 16:27:51,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-08 16:27:51,071 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 79 transitions. [2018-12-08 16:27:51,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-12-08 16:27:51,073 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:51,073 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:51,073 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:51,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:51,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1986920854, now seen corresponding path program 3 times [2018-12-08 16:27:51,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:51,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:51,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:27:51,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:51,074 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:51,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:51,126 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 41 proven. 82 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2018-12-08 16:27:51,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:51,126 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:51,127 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:51,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:51,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:51,127 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:51,132 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 16:27:51,133 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 16:27:51,143 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 16:27:51,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:51,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:51,165 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2018-12-08 16:27:51,165 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:51,455 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 142 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-12-08 16:27:51,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:51,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 11] total 13 [2018-12-08 16:27:51,471 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:51,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 16:27:51,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 16:27:51,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-08 16:27:51,472 INFO L87 Difference]: Start difference. First operand 60 states and 79 transitions. Second operand 8 states. [2018-12-08 16:27:51,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:51,530 INFO L93 Difference]: Finished difference Result 85 states and 124 transitions. [2018-12-08 16:27:51,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-08 16:27:51,531 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 82 [2018-12-08 16:27:51,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:51,532 INFO L225 Difference]: With dead ends: 85 [2018-12-08 16:27:51,532 INFO L226 Difference]: Without dead ends: 71 [2018-12-08 16:27:51,533 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 153 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-08 16:27:51,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-12-08 16:27:51,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 58. [2018-12-08 16:27:51,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-08 16:27:51,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2018-12-08 16:27:51,541 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 82 [2018-12-08 16:27:51,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:51,542 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2018-12-08 16:27:51,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 16:27:51,542 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2018-12-08 16:27:51,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-08 16:27:51,544 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:51,544 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:51,544 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:51,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:51,544 INFO L82 PathProgramCache]: Analyzing trace with hash -19418837, now seen corresponding path program 4 times [2018-12-08 16:27:51,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:51,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:51,545 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:27:51,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:51,545 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:51,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:51,652 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 261 proven. 28 refuted. 0 times theorem prover too weak. 458 trivial. 0 not checked. [2018-12-08 16:27:51,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:51,652 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:51,652 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:51,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:51,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:51,653 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:51,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:51,659 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 16:27:51,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:51,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:51,742 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 47 proven. 280 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-12-08 16:27:51,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:52,176 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 47 proven. 306 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2018-12-08 16:27:52,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:52,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 13] total 22 [2018-12-08 16:27:52,191 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:52,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-08 16:27:52,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-08 16:27:52,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2018-12-08 16:27:52,191 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 16 states. [2018-12-08 16:27:52,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:52,437 INFO L93 Difference]: Finished difference Result 145 states and 227 transitions. [2018-12-08 16:27:52,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-08 16:27:52,437 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 123 [2018-12-08 16:27:52,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:52,438 INFO L225 Difference]: With dead ends: 145 [2018-12-08 16:27:52,438 INFO L226 Difference]: Without dead ends: 88 [2018-12-08 16:27:52,439 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 226 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=360, Invalid=1046, Unknown=0, NotChecked=0, Total=1406 [2018-12-08 16:27:52,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-08 16:27:52,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2018-12-08 16:27:52,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-08 16:27:52,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2018-12-08 16:27:52,444 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 123 [2018-12-08 16:27:52,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:52,444 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2018-12-08 16:27:52,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-08 16:27:52,445 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2018-12-08 16:27:52,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-12-08 16:27:52,446 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:52,446 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 23, 14, 14, 14, 14, 14, 14, 14, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:52,446 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:52,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:52,446 INFO L82 PathProgramCache]: Analyzing trace with hash -509498553, now seen corresponding path program 5 times [2018-12-08 16:27:52,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:52,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:52,447 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:52,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:52,447 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:52,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:52,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 669 proven. 122 refuted. 0 times theorem prover too weak. 1450 trivial. 0 not checked. [2018-12-08 16:27:52,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:52,573 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:52,573 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:52,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:52,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:52,574 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:52,579 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 16:27:52,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 16:27:52,601 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-08 16:27:52,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:52,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:52,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 680 proven. 71 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2018-12-08 16:27:52,627 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:53,115 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 680 proven. 80 refuted. 0 times theorem prover too weak. 1481 trivial. 0 not checked. [2018-12-08 16:27:53,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:53,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13] total 19 [2018-12-08 16:27:53,130 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:53,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-08 16:27:53,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-08 16:27:53,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-12-08 16:27:53,131 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 14 states. [2018-12-08 16:27:53,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:53,279 INFO L93 Difference]: Finished difference Result 148 states and 211 transitions. [2018-12-08 16:27:53,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-08 16:27:53,279 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 204 [2018-12-08 16:27:53,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:53,280 INFO L225 Difference]: With dead ends: 148 [2018-12-08 16:27:53,280 INFO L226 Difference]: Without dead ends: 83 [2018-12-08 16:27:53,281 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 394 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-12-08 16:27:53,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-08 16:27:53,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2018-12-08 16:27:53,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-08 16:27:53,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-12-08 16:27:53,286 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 204 [2018-12-08 16:27:53,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:53,287 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-12-08 16:27:53,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-08 16:27:53,287 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-12-08 16:27:53,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-12-08 16:27:53,288 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:53,288 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:53,288 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:53,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:53,288 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2018-12-08 16:27:53,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:53,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:53,289 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:27:53,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:53,289 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:53,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:53,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 137 proven. 567 refuted. 0 times theorem prover too weak. 1876 trivial. 0 not checked. [2018-12-08 16:27:53,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:53,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:53,352 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:53,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:53,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:53,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:53,358 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 16:27:53,358 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 16:27:53,381 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 16:27:53,381 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:53,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:53,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 108 proven. 716 refuted. 0 times theorem prover too weak. 1756 trivial. 0 not checked. [2018-12-08 16:27:53,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:54,046 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 108 proven. 756 refuted. 0 times theorem prover too weak. 1716 trivial. 0 not checked. [2018-12-08 16:27:54,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:54,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 15] total 16 [2018-12-08 16:27:54,061 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:54,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-08 16:27:54,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-08 16:27:54,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2018-12-08 16:27:54,062 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 10 states. [2018-12-08 16:27:54,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:54,138 INFO L93 Difference]: Finished difference Result 105 states and 148 transitions. [2018-12-08 16:27:54,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-08 16:27:54,138 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 218 [2018-12-08 16:27:54,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:54,139 INFO L225 Difference]: With dead ends: 105 [2018-12-08 16:27:54,139 INFO L226 Difference]: Without dead ends: 91 [2018-12-08 16:27:54,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 421 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2018-12-08 16:27:54,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-08 16:27:54,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 78. [2018-12-08 16:27:54,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-08 16:27:54,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2018-12-08 16:27:54,145 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 218 [2018-12-08 16:27:54,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:54,145 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2018-12-08 16:27:54,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-08 16:27:54,145 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2018-12-08 16:27:54,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-12-08 16:27:54,147 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:54,147 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:54,147 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:54,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:54,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 7 times [2018-12-08 16:27:54,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:54,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:54,148 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:27:54,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:54,148 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:54,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:54,440 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2018-12-08 16:27:54,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:54,441 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:54,441 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:54,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:54,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:54,441 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:54,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:54,446 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 16:27:54,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:54,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:54,732 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2018-12-08 16:27:54,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:56,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2018-12-08 16:27:56,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:56,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 28 [2018-12-08 16:27:56,046 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:56,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-08 16:27:56,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-08 16:27:56,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2018-12-08 16:27:56,047 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 28 states. [2018-12-08 16:27:56,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:56,273 INFO L93 Difference]: Finished difference Result 117 states and 173 transitions. [2018-12-08 16:27:56,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-08 16:27:56,273 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 286 [2018-12-08 16:27:56,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:56,274 INFO L225 Difference]: With dead ends: 117 [2018-12-08 16:27:56,274 INFO L226 Difference]: Without dead ends: 110 [2018-12-08 16:27:56,274 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 657 GetRequests, 588 SyntacticMatches, 42 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2018-12-08 16:27:56,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-08 16:27:56,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 88. [2018-12-08 16:27:56,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-08 16:27:56,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2018-12-08 16:27:56,284 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 286 [2018-12-08 16:27:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:56,284 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2018-12-08 16:27:56,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-08 16:27:56,284 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2018-12-08 16:27:56,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-12-08 16:27:56,285 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:27:56,285 INFO L402 BasicCegarLoop]: trace histogram [63, 63, 51, 31, 31, 31, 31, 31, 31, 31, 20, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:27:56,285 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:27:56,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:27:56,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1851025972, now seen corresponding path program 8 times [2018-12-08 16:27:56,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 16:27:56,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:56,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:27:56,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:27:56,286 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 16:27:56,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:27:56,442 INFO L134 CoverageAnalysis]: Checked inductivity of 10947 backedges. 1241 proven. 745 refuted. 0 times theorem prover too weak. 8961 trivial. 0 not checked. [2018-12-08 16:27:56,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:56,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 16:27:56,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 16:27:56,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 16:27:56,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:27:56,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 16:27:56,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 16:27:56,448 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 16:27:56,505 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-08 16:27:56,506 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:27:56,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:27:56,598 INFO L134 CoverageAnalysis]: Checked inductivity of 10947 backedges. 1299 proven. 263 refuted. 0 times theorem prover too weak. 9385 trivial. 0 not checked. [2018-12-08 16:27:56,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:27:57,383 INFO L134 CoverageAnalysis]: Checked inductivity of 10947 backedges. 1299 proven. 297 refuted. 0 times theorem prover too weak. 9351 trivial. 0 not checked. [2018-12-08 16:27:57,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 16:27:57,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 13] total 22 [2018-12-08 16:27:57,398 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 16:27:57,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-08 16:27:57,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-08 16:27:57,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=334, Unknown=0, NotChecked=0, Total=462 [2018-12-08 16:27:57,399 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand 16 states. [2018-12-08 16:27:57,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:27:57,538 INFO L93 Difference]: Finished difference Result 122 states and 206 transitions. [2018-12-08 16:27:57,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-08 16:27:57,538 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 436 [2018-12-08 16:27:57,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:27:57,539 INFO L225 Difference]: With dead ends: 122 [2018-12-08 16:27:57,539 INFO L226 Difference]: Without dead ends: 0 [2018-12-08 16:27:57,539 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 896 GetRequests, 858 SyntacticMatches, 10 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=287, Invalid=583, Unknown=0, NotChecked=0, Total=870 [2018-12-08 16:27:57,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-08 16:27:57,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-08 16:27:57,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-08 16:27:57,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-08 16:27:57,540 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 436 [2018-12-08 16:27:57,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:27:57,540 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-08 16:27:57,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-08 16:27:57,540 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-08 16:27:57,540 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-08 16:27:57,543 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-08 16:27:57,554 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,575 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,598 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,604 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,609 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,615 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,620 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,629 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,637 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,647 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,652 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,663 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,663 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,669 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,677 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,686 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,697 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,705 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,714 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:57,720 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-08 16:27:58,016 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 48 [2018-12-08 16:27:58,062 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-08 16:27:58,062 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point L27(line 27) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point L26(lines 26 28) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L444 ceAbstractionStarter]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 7) (<= 7 main_~x~0)) [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point L25-1(line 25) no Hoare annotation was computed. [2018-12-08 16:27:58,062 INFO L448 ceAbstractionStarter]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (< 1 fibo_~n)) [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L444 ceAbstractionStarter]: At program point L11-2(line 11) the Hoare annotation is: (and (let ((.cse1 (<= |fibo_#t~ret0| 1)) (.cse2 (<= 1 |fibo_#t~ret0|)) (.cse0 (<= fibo_~n |fibo_#in~n|)) (.cse3 (<= |fibo_#in~n| fibo_~n))) (or (and (<= |fibo_#in~n| 2) .cse0 .cse1 .cse2 (< 1 fibo_~n)) (and .cse0 (<= 3 |fibo_#t~ret0|) (<= |fibo_#t~ret0| 3) (<= |fibo_#in~n| 5) (<= 5 fibo_~n)) (and (and .cse0 .cse3) (<= 6 |fibo_#in~n|)) (and .cse0 .cse1 (<= |fibo_#in~n| 3) .cse2 (<= 3 fibo_~n)) (and (<= 4 |fibo_#in~n|) (<= |fibo_#in~n| 4) .cse0 .cse3 (<= 2 |fibo_#t~ret0|) (<= |fibo_#t~ret0| 2)))) (or (not (= |fibo_#in~n| 6)) (and (<= |fibo_#t~ret0| 5) (<= 5 |fibo_#t~ret0|))) (or (not (= |fibo_#in~n| 7)) (and (<= |fibo_#t~ret0| 8) (<= 8 |fibo_#t~ret0|)))) [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point L8(lines 8 12) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point L11-3(line 11) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L448 ceAbstractionStarter]: For program point L6(lines 6 12) no Hoare annotation was computed. [2018-12-08 16:27:58,063 INFO L451 ceAbstractionStarter]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2018-12-08 16:27:58,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 08.12 04:27:58 BoogieIcfgContainer [2018-12-08 16:27:58,065 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-08 16:27:58,065 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-08 16:27:58,065 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-08 16:27:58,065 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-08 16:27:58,065 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:27:48" (3/4) ... [2018-12-08 16:27:58,067 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-08 16:27:58,071 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-08 16:27:58,072 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-08 16:27:58,072 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo [2018-12-08 16:27:58,074 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-08 16:27:58,074 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-08 16:27:58,074 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-08 16:27:58,097 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_001f3ee8-4f78-42d8-94f9-d898f3400f1c/bin-2019/utaipan/witness.graphml [2018-12-08 16:27:58,097 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-08 16:27:58,098 INFO L168 Benchmark]: Toolchain (without parser) took 9769.06 ms. Allocated memory was 1.0 GB in the beginning and 1.5 GB in the end (delta: 446.7 MB). Free memory was 957.8 MB in the beginning and 781.4 MB in the end (delta: 176.4 MB). Peak memory consumption was 623.1 MB. Max. memory is 11.5 GB. [2018-12-08 16:27:58,098 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:27:58,098 INFO L168 Benchmark]: CACSL2BoogieTranslator took 114.60 ms. Allocated memory is still 1.0 GB. Free memory was 957.8 MB in the beginning and 947.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-08 16:27:58,098 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.68 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:27:58,099 INFO L168 Benchmark]: Boogie Preprocessor took 10.43 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:27:58,099 INFO L168 Benchmark]: RCFGBuilder took 149.84 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 92.8 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -124.5 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. [2018-12-08 16:27:58,099 INFO L168 Benchmark]: TraceAbstraction took 9447.51 ms. Allocated memory was 1.1 GB in the beginning and 1.5 GB in the end (delta: 353.9 MB). Free memory was 1.1 GB in the beginning and 781.4 MB in the end (delta: 290.1 MB). Peak memory consumption was 644.0 MB. Max. memory is 11.5 GB. [2018-12-08 16:27:58,099 INFO L168 Benchmark]: Witness Printer took 32.27 ms. Allocated memory is still 1.5 GB. Free memory is still 781.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:27:58,100 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 114.60 ms. Allocated memory is still 1.0 GB. Free memory was 957.8 MB in the beginning and 947.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.68 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.43 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 149.84 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 92.8 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -124.5 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 9447.51 ms. Allocated memory was 1.1 GB in the beginning and 1.5 GB in the end (delta: 353.9 MB). Free memory was 1.1 GB in the beginning and 781.4 MB in the end (delta: 290.1 MB). Peak memory consumption was 644.0 MB. Max. memory is 11.5 GB. * Witness Printer took 32.27 ms. Allocated memory is still 1.5 GB. Free memory is still 781.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. SAFE Result, 9.4s OverallTime, 12 OverallIterations, 63 TraceHistogramMax, 1.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.5s HoareAnnotationTime, HoareTripleCheckerStatistics: 291 SDtfs, 371 SDslu, 1578 SDs, 0 SdLazy, 1584 SolverSat, 360 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 3260 GetRequests, 2929 SyntacticMatches, 111 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1104 ImplicationChecksByTransitivity, 1.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=88occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.7s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.84 AbsIntWeakeningRatio, 0.56 AbsIntAvgWeakeningVarsNumRemoved, 0.16 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 12 MinimizatonAttempts, 95 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 179 PreInvPairs, 366 NumberOfFragments, 126 HoareAnnotationTreeSize, 179 FomulaSimplifications, 35996 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 8 FomulaSimplificationsInter, 3901 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 5.7s InterpolantComputationTime, 3045 NumberOfCodeBlocks, 2666 NumberOfCodeBlocksAsserted, 65 NumberOfCheckSat, 4511 ConstructedInterpolants, 0 QuantifiedInterpolants, 2336491 SizeOfPredicates, 43 NumberOfNonLiveVariables, 2455 ConjunctsInSsa, 249 ConjunctsInUnsatCore, 30 InterpolantComputations, 2 PerfectInterpolantSequences, 55716/64983 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...