./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 02:35:49,711 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 02:35:49,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 02:35:49,800 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 02:35:49,801 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 02:35:49,805 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 02:35:49,807 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 02:35:49,814 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 02:35:49,817 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 02:35:49,823 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 02:35:49,824 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 02:35:49,826 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 02:35:49,827 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 02:35:49,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 02:35:49,832 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 02:35:49,836 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 02:35:49,842 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 02:35:49,843 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 02:35:49,845 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 02:35:49,853 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 02:35:49,855 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 02:35:49,857 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 02:35:49,860 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 02:35:49,861 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 02:35:49,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 02:35:49,871 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 02:35:49,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 02:35:49,874 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 02:35:49,875 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 02:35:49,876 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 02:35:49,877 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 02:35:49,879 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 02:35:49,881 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 02:35:49,882 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 02:35:49,883 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 02:35:49,884 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 02:35:49,885 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 02:35:49,885 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 02:35:49,885 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 02:35:49,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 02:35:49,887 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 02:35:49,888 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-64bit-Taipan_Default.epf [2021-11-13 02:35:49,926 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 02:35:49,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 02:35:49,932 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 02:35:49,932 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 02:35:49,932 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-13 02:35:49,933 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-13 02:35:49,933 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-13 02:35:49,933 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-13 02:35:49,940 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-13 02:35:49,940 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-13 02:35:49,941 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-13 02:35:49,942 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-13 02:35:49,942 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-13 02:35:49,942 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-13 02:35:49,943 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-13 02:35:49,943 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-13 02:35:49,944 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 02:35:49,944 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-13 02:35:49,945 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 02:35:49,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 02:35:49,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 02:35:49,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 02:35:49,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 02:35:49,946 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-13 02:35:49,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 02:35:49,947 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 02:35:49,947 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 02:35:49,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 02:35:49,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 02:35:49,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:35:49,950 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 02:35:49,950 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 02:35:49,950 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 02:35:49,951 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-13 02:35:49,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 02:35:49,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 02:35:49,952 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 02:35:49,952 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 02:35:49,952 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 [2021-11-13 02:35:50,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 02:35:50,235 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 02:35:50,237 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 02:35:50,238 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 02:35:50,239 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 02:35:50,240 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-13 02:35:50,316 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/data/3c2ace560/2f281e86458c4cabba23d9c5d9a3001b/FLAG23ada1dd9 [2021-11-13 02:35:50,766 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 02:35:50,767 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-13 02:35:50,774 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/data/3c2ace560/2f281e86458c4cabba23d9c5d9a3001b/FLAG23ada1dd9 [2021-11-13 02:35:51,134 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/data/3c2ace560/2f281e86458c4cabba23d9c5d9a3001b [2021-11-13 02:35:51,136 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 02:35:51,138 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 02:35:51,139 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 02:35:51,140 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 02:35:51,143 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 02:35:51,143 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,145 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@87625e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51, skipping insertion in model container [2021-11-13 02:35:51,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,152 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 02:35:51,165 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 02:35:51,344 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-13 02:35:51,345 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:35:51,354 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 02:35:51,367 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-13 02:35:51,368 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:35:51,381 INFO L208 MainTranslator]: Completed translation [2021-11-13 02:35:51,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51 WrapperNode [2021-11-13 02:35:51,381 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 02:35:51,383 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 02:35:51,383 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 02:35:51,383 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 02:35:51,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,406 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,425 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 02:35:51,426 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 02:35:51,426 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 02:35:51,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 02:35:51,435 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,436 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,437 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,437 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,443 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,444 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 02:35:51,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 02:35:51,447 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 02:35:51,447 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 02:35:51,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (1/1) ... [2021-11-13 02:35:51,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:35:51,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:51,503 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 02:35:51,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 02:35:51,548 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-13 02:35:51,548 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-13 02:35:51,548 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 02:35:51,548 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 02:35:51,548 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 02:35:51,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 02:35:51,803 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 02:35:51,803 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-13 02:35:51,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:35:51 BoogieIcfgContainer [2021-11-13 02:35:51,806 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 02:35:51,814 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 02:35:51,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 02:35:51,818 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 02:35:51,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 02:35:51" (1/3) ... [2021-11-13 02:35:51,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@90ade5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:35:51, skipping insertion in model container [2021-11-13 02:35:51,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:35:51" (2/3) ... [2021-11-13 02:35:51,820 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@90ade5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:35:51, skipping insertion in model container [2021-11-13 02:35:51,820 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:35:51" (3/3) ... [2021-11-13 02:35:51,821 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-2.c [2021-11-13 02:35:51,827 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 02:35:51,827 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-13 02:35:51,878 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 02:35:51,886 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 02:35:51,886 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-13 02:35:51,904 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 02:35:51,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-13 02:35:51,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:51,910 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:51,911 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:51,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:51,917 INFO L85 PathProgramCache]: Analyzing trace with hash 1639303625, now seen corresponding path program 1 times [2021-11-13 02:35:51,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:51,929 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491945231] [2021-11-13 02:35:51,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:51,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:52,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:52,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:52,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:52,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491945231] [2021-11-13 02:35:52,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491945231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:52,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:35:52,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 02:35:52,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704295292] [2021-11-13 02:35:52,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:52,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:35:52,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:52,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:35:52,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:52,162 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:52,263 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-13 02:35:52,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:35:52,266 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-13 02:35:52,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:52,274 INFO L225 Difference]: With dead ends: 27 [2021-11-13 02:35:52,275 INFO L226 Difference]: Without dead ends: 22 [2021-11-13 02:35:52,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 02:35:52,283 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 48.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.05ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 60.44ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:52,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 55 Unknown, 0 Unchecked, 3.05ms Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 60.44ms Time] [2021-11-13 02:35:52,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-13 02:35:52,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-13 02:35:52,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:35:52,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-13 02:35:52,325 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 7 [2021-11-13 02:35:52,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:52,326 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-13 02:35:52,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,326 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-13 02:35:52,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-13 02:35:52,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:52,328 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:52,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 02:35:52,328 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:52,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:52,330 INFO L85 PathProgramCache]: Analyzing trace with hash -721195135, now seen corresponding path program 1 times [2021-11-13 02:35:52,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:52,330 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053840218] [2021-11-13 02:35:52,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:52,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:52,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:52,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 02:35:52,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:52,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053840218] [2021-11-13 02:35:52,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053840218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:52,368 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:35:52,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-13 02:35:52,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061481708] [2021-11-13 02:35:52,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:52,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 02:35:52,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:52,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 02:35:52,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 02:35:52,372 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:52,392 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-13 02:35:52,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 02:35:52,392 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-13 02:35:52,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:52,395 INFO L225 Difference]: With dead ends: 24 [2021-11-13 02:35:52,395 INFO L226 Difference]: Without dead ends: 22 [2021-11-13 02:35:52,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 02:35:52,397 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.87ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.76ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:52,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 24 Invalid, 11 Unknown, 0 Unchecked, 0.87ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 13.76ms Time] [2021-11-13 02:35:52,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-13 02:35:52,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-11-13 02:35:52,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:35:52,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-13 02:35:52,406 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 8 [2021-11-13 02:35:52,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:52,407 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-13 02:35:52,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 02:35:52,407 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-13 02:35:52,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-13 02:35:52,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:52,409 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:52,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 02:35:52,409 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:52,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:52,410 INFO L85 PathProgramCache]: Analyzing trace with hash -793689855, now seen corresponding path program 1 times [2021-11-13 02:35:52,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:52,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981133624] [2021-11-13 02:35:52,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:52,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:52,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:52,510 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 02:35:52,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:52,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981133624] [2021-11-13 02:35:52,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981133624] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:52,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:35:52,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 02:35:52,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401139607] [2021-11-13 02:35:52,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:52,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:35:52,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:52,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:35:52,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:52,515 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:35:52,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:52,585 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-13 02:35:52,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:35:52,591 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-13 02:35:52,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:52,592 INFO L225 Difference]: With dead ends: 36 [2021-11-13 02:35:52,592 INFO L226 Difference]: Without dead ends: 34 [2021-11-13 02:35:52,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:52,594 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.58ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 54.15ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:52,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 33 Unknown, 0 Unchecked, 2.58ms Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 54.15ms Time] [2021-11-13 02:35:52,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-13 02:35:52,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-13 02:35:52,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-13 02:35:52,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-13 02:35:52,605 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2021-11-13 02:35:52,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:52,606 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-13 02:35:52,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:35:52,606 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-13 02:35:52,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-13 02:35:52,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:52,615 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:52,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-13 02:35:52,616 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:52,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:52,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1176736919, now seen corresponding path program 1 times [2021-11-13 02:35:52,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:52,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538919189] [2021-11-13 02:35:52,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:52,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:52,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:52,726 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 02:35:52,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:52,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538919189] [2021-11-13 02:35:52,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538919189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:52,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777606001] [2021-11-13 02:35:52,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:52,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:52,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:52,730 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:52,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 02:35:52,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:52,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 02:35:52,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:53,067 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 02:35:53,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:53,296 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 02:35:53,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777606001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:53,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941344021] [2021-11-13 02:35:53,322 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-13 02:35:53,322 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:53,328 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:35:53,335 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:53,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-13 02:35:53,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641148774] [2021-11-13 02:35:53,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:53,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 02:35:53,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:53,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 02:35:53,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-13 02:35:53,344 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 02:35:53,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:53,697 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-13 02:35:53,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 02:35:53,698 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2021-11-13 02:35:53,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:53,704 INFO L225 Difference]: With dead ends: 90 [2021-11-13 02:35:53,705 INFO L226 Difference]: Without dead ends: 64 [2021-11-13 02:35:53,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-13 02:35:53,718 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 121 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 129.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.66ms SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 160.52ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:53,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 67 Invalid, 223 Unknown, 0 Unchecked, 11.66ms Time], IncrementalHoareTripleChecker [55 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 160.52ms Time] [2021-11-13 02:35:53,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-13 02:35:53,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-13 02:35:53,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-13 02:35:53,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-13 02:35:53,742 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 24 [2021-11-13 02:35:53,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:53,743 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-13 02:35:53,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 02:35:53,745 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-13 02:35:53,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 02:35:53,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:53,747 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:53,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:53,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:53,961 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:53,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:53,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1108024065, now seen corresponding path program 2 times [2021-11-13 02:35:53,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:53,962 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870087844] [2021-11-13 02:35:53,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:53,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:53,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:54,032 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,032 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:54,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870087844] [2021-11-13 02:35:54,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870087844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:54,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068731107] [2021-11-13 02:35:54,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:35:54,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:54,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:54,034 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:54,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 02:35:54,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-13 02:35:54,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:54,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-13 02:35:54,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:54,186 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:54,280 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2068731107] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:54,281 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:35:54,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-13 02:35:54,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167136034] [2021-11-13 02:35:54,281 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:54,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 02:35:54,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:54,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 02:35:54,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-13 02:35:54,283 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:54,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:54,331 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-13 02:35:54,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 02:35:54,332 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2021-11-13 02:35:54,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:54,334 INFO L225 Difference]: With dead ends: 60 [2021-11-13 02:35:54,334 INFO L226 Difference]: Without dead ends: 59 [2021-11-13 02:35:54,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-13 02:35:54,336 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 10 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.77ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.25ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:54,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 59 Invalid, 33 Unknown, 0 Unchecked, 0.77ms Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 27.25ms Time] [2021-11-13 02:35:54,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-13 02:35:54,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-13 02:35:54,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-13 02:35:54,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-13 02:35:54,353 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 30 [2021-11-13 02:35:54,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:54,353 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-13 02:35:54,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:54,354 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-13 02:35:54,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-13 02:35:54,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:54,355 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:54,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:54,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:54,556 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:54,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:54,557 INFO L85 PathProgramCache]: Analyzing trace with hash -10992299, now seen corresponding path program 1 times [2021-11-13 02:35:54,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:54,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931861150] [2021-11-13 02:35:54,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:54,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:54,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:54,626 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,627 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:54,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931861150] [2021-11-13 02:35:54,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931861150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:54,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079102567] [2021-11-13 02:35:54,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:54,628 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:54,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:54,639 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:54,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 02:35:54,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:54,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-13 02:35:54,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:54,792 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:35:54,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079102567] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:54,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278162154] [2021-11-13 02:35:54,882 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:35:54,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:54,883 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:35:54,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:54,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-13 02:35:54,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743539056] [2021-11-13 02:35:54,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:54,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 02:35:54,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:54,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 02:35:54,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-13 02:35:54,889 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 02:35:54,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:54,982 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-13 02:35:54,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 02:35:54,983 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 31 [2021-11-13 02:35:54,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:54,989 INFO L225 Difference]: With dead ends: 69 [2021-11-13 02:35:54,989 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 02:35:54,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-13 02:35:54,992 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 41.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.42ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 51.54ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:54,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 132 Invalid, 77 Unknown, 0 Unchecked, 3.42ms Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 51.54ms Time] [2021-11-13 02:35:54,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 02:35:55,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-13 02:35:55,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2021-11-13 02:35:55,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-13 02:35:55,022 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 31 [2021-11-13 02:35:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:55,022 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-13 02:35:55,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 02:35:55,023 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-13 02:35:55,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-13 02:35:55,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:55,025 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:55,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:55,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:55,226 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:55,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:55,227 INFO L85 PathProgramCache]: Analyzing trace with hash 824601704, now seen corresponding path program 1 times [2021-11-13 02:35:55,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:55,227 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463802056] [2021-11-13 02:35:55,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:55,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:55,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:55,346 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-13 02:35:55,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:55,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463802056] [2021-11-13 02:35:55,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463802056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:55,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626688986] [2021-11-13 02:35:55,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:55,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:55,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:55,349 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:55,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 02:35:55,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:55,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-13 02:35:55,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:55,593 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-13 02:35:55,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:55,833 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-13 02:35:55,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626688986] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:55,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051255763] [2021-11-13 02:35:55,836 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:35:55,836 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:55,837 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:35:55,838 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:55,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-13 02:35:55,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180428572] [2021-11-13 02:35:55,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:55,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 02:35:55,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:55,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 02:35:55,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-13 02:35:55,840 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-13 02:35:56,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:56,086 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-13 02:35:56,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 02:35:56,087 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 50 [2021-11-13 02:35:56,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:56,095 INFO L225 Difference]: With dead ends: 134 [2021-11-13 02:35:56,096 INFO L226 Difference]: Without dead ends: 133 [2021-11-13 02:35:56,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-13 02:35:56,099 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 39 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 105.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.43ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 131.90ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:56,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 195 Invalid, 190 Unknown, 0 Unchecked, 3.43ms Time], IncrementalHoareTripleChecker [16 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 131.90ms Time] [2021-11-13 02:35:56,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-13 02:35:56,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-13 02:35:56,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-13 02:35:56,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-13 02:35:56,145 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2021-11-13 02:35:56,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:56,145 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-13 02:35:56,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-13 02:35:56,146 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-13 02:35:56,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-13 02:35:56,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:56,151 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-13 02:35:56,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:56,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:56,365 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:56,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:56,366 INFO L85 PathProgramCache]: Analyzing trace with hash -253469865, now seen corresponding path program 1 times [2021-11-13 02:35:56,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:56,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4868732] [2021-11-13 02:35:56,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:56,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:56,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:56,491 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-13 02:35:56,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:56,492 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4868732] [2021-11-13 02:35:56,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4868732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:56,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:35:56,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 02:35:56,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826182702] [2021-11-13 02:35:56,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:56,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:35:56,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:56,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:35:56,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:56,494 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:56,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:56,528 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-13 02:35:56,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:35:56,528 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2021-11-13 02:35:56,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:56,531 INFO L225 Difference]: With dead ends: 111 [2021-11-13 02:35:56,531 INFO L226 Difference]: Without dead ends: 110 [2021-11-13 02:35:56,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:56,532 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.73ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.61ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:56,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 55 Invalid, 33 Unknown, 0 Unchecked, 0.73ms Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 22.61ms Time] [2021-11-13 02:35:56,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-13 02:35:56,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-13 02:35:56,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-13 02:35:56,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-13 02:35:56,569 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 69 [2021-11-13 02:35:56,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:56,570 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-13 02:35:56,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:56,570 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-13 02:35:56,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-13 02:35:56,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:56,573 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-13 02:35:56,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-13 02:35:56,574 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:56,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:56,574 INFO L85 PathProgramCache]: Analyzing trace with hash -631086987, now seen corresponding path program 2 times [2021-11-13 02:35:56,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:56,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271092215] [2021-11-13 02:35:56,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:56,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:56,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:56,674 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-13 02:35:56,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:56,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271092215] [2021-11-13 02:35:56,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271092215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:35:56,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:35:56,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 02:35:56,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041593433] [2021-11-13 02:35:56,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:35:56,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:35:56,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:56,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:35:56,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:56,677 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:56,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:56,718 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-13 02:35:56,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:35:56,722 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 64 [2021-11-13 02:35:56,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:56,724 INFO L225 Difference]: With dead ends: 111 [2021-11-13 02:35:56,724 INFO L226 Difference]: Without dead ends: 110 [2021-11-13 02:35:56,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:35:56,725 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.60ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.59ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:56,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.60ms Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 32.59ms Time] [2021-11-13 02:35:56,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-13 02:35:56,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-13 02:35:56,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-13 02:35:56,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-13 02:35:56,748 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 64 [2021-11-13 02:35:56,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:56,749 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-13 02:35:56,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:35:56,749 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-13 02:35:56,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-13 02:35:56,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:56,761 INFO L514 BasicCegarLoop]: trace histogram [18, 15, 14, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 4, 1, 1, 1, 1] [2021-11-13 02:35:56,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-13 02:35:56,761 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:56,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:56,762 INFO L85 PathProgramCache]: Analyzing trace with hash 1107215024, now seen corresponding path program 2 times [2021-11-13 02:35:56,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:56,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934662511] [2021-11-13 02:35:56,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:56,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:56,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:56,949 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 59 proven. 238 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2021-11-13 02:35:56,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:56,950 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934662511] [2021-11-13 02:35:56,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934662511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:56,950 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461535290] [2021-11-13 02:35:56,951 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:35:56,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:56,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:56,952 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:56,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 02:35:57,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-13 02:35:57,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:57,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-13 02:35:57,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:57,436 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 303 proven. 85 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-11-13 02:35:57,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 303 proven. 88 refuted. 0 times theorem prover too weak. 493 trivial. 0 not checked. [2021-11-13 02:35:58,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461535290] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:58,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765866456] [2021-11-13 02:35:58,231 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:35:58,231 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:58,231 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:35:58,233 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:58,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-11-13 02:35:58,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062323833] [2021-11-13 02:35:58,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:58,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 02:35:58,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:58,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 02:35:58,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-11-13 02:35:58,236 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-13 02:35:58,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:58,625 INFO L93 Difference]: Finished difference Result 245 states and 452 transitions. [2021-11-13 02:35:58,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-13 02:35:58,627 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 162 [2021-11-13 02:35:58,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:58,629 INFO L225 Difference]: With dead ends: 245 [2021-11-13 02:35:58,629 INFO L226 Difference]: Without dead ends: 150 [2021-11-13 02:35:58,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=224, Invalid=588, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:35:58,631 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 243 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 168.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.77ms SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 208.08ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:58,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 86 Invalid, 331 Unknown, 0 Unchecked, 3.77ms Time], IncrementalHoareTripleChecker [142 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 208.08ms Time] [2021-11-13 02:35:58,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-13 02:35:58,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 135. [2021-11-13 02:35:58,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 106 states have (on average 1.0849056603773586) internal successors, (115), 103 states have internal predecessors, (115), 15 states have call successors, (15), 6 states have call predecessors, (15), 12 states have return successors, (77), 25 states have call predecessors, (77), 14 states have call successors, (77) [2021-11-13 02:35:58,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 207 transitions. [2021-11-13 02:35:58,647 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 207 transitions. Word has length 162 [2021-11-13 02:35:58,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:58,647 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 207 transitions. [2021-11-13 02:35:58,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-13 02:35:58,648 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 207 transitions. [2021-11-13 02:35:58,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-13 02:35:58,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:58,649 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 7, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-13 02:35:58,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:58,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-13 02:35:58,875 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:35:58,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:58,875 INFO L85 PathProgramCache]: Analyzing trace with hash -931986032, now seen corresponding path program 3 times [2021-11-13 02:35:58,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:58,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686524094] [2021-11-13 02:35:58,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:58,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:58,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:58,951 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 74 proven. 3 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-13 02:35:58,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:58,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686524094] [2021-11-13 02:35:58,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686524094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:58,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284703161] [2021-11-13 02:35:58,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:35:58,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:58,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:58,967 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:58,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 02:35:59,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:35:59,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:59,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-13 02:35:59,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:59,293 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 79 proven. 85 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-13 02:35:59,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:59,890 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 79 proven. 93 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-13 02:35:59,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284703161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:59,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229170344] [2021-11-13 02:35:59,893 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:35:59,893 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:59,893 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:35:59,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:59,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 13] total 17 [2021-11-13 02:35:59,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194299809] [2021-11-13 02:35:59,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:59,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 02:35:59,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:59,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 02:35:59,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-11-13 02:35:59,896 INFO L87 Difference]: Start difference. First operand 135 states and 207 transitions. Second operand has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-13 02:36:00,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:00,123 INFO L93 Difference]: Finished difference Result 196 states and 304 transitions. [2021-11-13 02:36:00,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 02:36:00,124 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) Word has length 89 [2021-11-13 02:36:00,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:00,127 INFO L225 Difference]: With dead ends: 196 [2021-11-13 02:36:00,127 INFO L226 Difference]: Without dead ends: 64 [2021-11-13 02:36:00,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 166 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:36:00,130 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 95 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 100.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.34ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 125.08ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:00,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 94 Invalid, 217 Unknown, 0 Unchecked, 2.34ms Time], IncrementalHoareTripleChecker [41 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 125.08ms Time] [2021-11-13 02:36:00,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-13 02:36:00,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-13 02:36:00,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-13 02:36:00,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-13 02:36:00,138 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 89 [2021-11-13 02:36:00,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:00,139 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-13 02:36:00,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-13 02:36:00,139 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-13 02:36:00,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 02:36:00,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:00,141 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-13 02:36:00,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:00,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:00,367 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:00,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:00,367 INFO L85 PathProgramCache]: Analyzing trace with hash -935145530, now seen corresponding path program 4 times [2021-11-13 02:36:00,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:00,367 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271613123] [2021-11-13 02:36:00,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:00,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:00,489 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-13 02:36:00,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:00,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271613123] [2021-11-13 02:36:00,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271613123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:00,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804987639] [2021-11-13 02:36:00,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:00,490 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:00,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:00,491 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:00,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 02:36:00,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:00,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-13 02:36:00,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:00,816 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 30 proven. 44 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-11-13 02:36:00,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:01,420 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 45 proven. 45 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-13 02:36:01,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804987639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:01,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564313482] [2021-11-13 02:36:01,427 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:01,427 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:01,428 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:01,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:01,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13] total 25 [2021-11-13 02:36:01,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237170836] [2021-11-13 02:36:01,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:01,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 02:36:01,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:01,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 02:36:01,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2021-11-13 02:36:01,431 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-13 02:36:01,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:01,568 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-13 02:36:01,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 02:36:01,569 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) Word has length 90 [2021-11-13 02:36:01,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:01,571 INFO L225 Difference]: With dead ends: 68 [2021-11-13 02:36:01,571 INFO L226 Difference]: Without dead ends: 67 [2021-11-13 02:36:01,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:36:01,572 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 34 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 69.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.58ms SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.78ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:01,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 202 Invalid, 154 Unknown, 0 Unchecked, 2.58ms Time], IncrementalHoareTripleChecker [20 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 85.78ms Time] [2021-11-13 02:36:01,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-13 02:36:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-13 02:36:01,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-13 02:36:01,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-13 02:36:01,579 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 90 [2021-11-13 02:36:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:01,579 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-13 02:36:01,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-13 02:36:01,580 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-13 02:36:01,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-13 02:36:01,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:01,585 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 13, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 3, 1, 1, 1, 1] [2021-11-13 02:36:01,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:01,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-13 02:36:01,799 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:01,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:01,799 INFO L85 PathProgramCache]: Analyzing trace with hash -983925103, now seen corresponding path program 3 times [2021-11-13 02:36:01,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:01,800 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253381196] [2021-11-13 02:36:01,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:01,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:01,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:02,002 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-13 02:36:02,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:02,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253381196] [2021-11-13 02:36:02,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253381196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:02,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068270489] [2021-11-13 02:36:02,003 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:02,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:02,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:02,004 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:02,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 02:36:02,081 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:02,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:02,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 02:36:02,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:02,544 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2021-11-13 02:36:02,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:03,836 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-11-13 02:36:03,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068270489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:03,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780514683] [2021-11-13 02:36:03,839 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:03,839 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:03,839 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:03,840 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:03,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2021-11-13 02:36:03,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720298950] [2021-11-13 02:36:03,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:03,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-13 02:36:03,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:03,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-13 02:36:03,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2021-11-13 02:36:03,842 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-13 02:36:04,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:04,166 INFO L93 Difference]: Finished difference Result 128 states and 176 transitions. [2021-11-13 02:36:04,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-13 02:36:04,166 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) Word has length 148 [2021-11-13 02:36:04,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:04,168 INFO L225 Difference]: With dead ends: 128 [2021-11-13 02:36:04,168 INFO L226 Difference]: Without dead ends: 127 [2021-11-13 02:36:04,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=385, Invalid=1255, Unknown=0, NotChecked=0, Total=1640 [2021-11-13 02:36:04,170 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 66 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 144.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.66ms SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 172.85ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:04,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 267 Invalid, 276 Unknown, 0 Unchecked, 4.66ms Time], IncrementalHoareTripleChecker [33 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 172.85ms Time] [2021-11-13 02:36:04,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-13 02:36:04,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 99. [2021-11-13 02:36:04,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 76 states have internal predecessors, (81), 11 states have call successors, (11), 6 states have call predecessors, (11), 9 states have return successors, (47), 16 states have call predecessors, (47), 10 states have call successors, (47) [2021-11-13 02:36:04,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 139 transitions. [2021-11-13 02:36:04,180 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 139 transitions. Word has length 148 [2021-11-13 02:36:04,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:04,181 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 139 transitions. [2021-11-13 02:36:04,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-13 02:36:04,181 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 139 transitions. [2021-11-13 02:36:04,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 378 [2021-11-13 02:36:04,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:04,188 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 31, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 18, 18, 12, 8, 1, 1, 1, 1] [2021-11-13 02:36:04,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:04,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:04,403 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:04,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:04,403 INFO L85 PathProgramCache]: Analyzing trace with hash 1924121871, now seen corresponding path program 4 times [2021-11-13 02:36:04,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:04,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987901483] [2021-11-13 02:36:04,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:04,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:04,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:04,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5045 backedges. 410 proven. 1234 refuted. 0 times theorem prover too weak. 3401 trivial. 0 not checked. [2021-11-13 02:36:04,700 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:04,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987901483] [2021-11-13 02:36:04,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987901483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:04,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946634665] [2021-11-13 02:36:04,701 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:04,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:04,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:04,702 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:04,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 02:36:04,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:04,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-13 02:36:04,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:05,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5045 backedges. 371 proven. 1723 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2021-11-13 02:36:05,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:07,283 INFO L134 CoverageAnalysis]: Checked inductivity of 5045 backedges. 371 proven. 1762 refuted. 0 times theorem prover too weak. 2912 trivial. 0 not checked. [2021-11-13 02:36:07,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946634665] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:07,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137714513] [2021-11-13 02:36:07,288 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:07,288 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:07,288 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:07,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:07,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2021-11-13 02:36:07,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580236919] [2021-11-13 02:36:07,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:07,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 02:36:07,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:07,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 02:36:07,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:36:07,297 INFO L87 Difference]: Start difference. First operand 99 states and 139 transitions. Second operand has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-13 02:36:07,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:07,794 INFO L93 Difference]: Finished difference Result 246 states and 392 transitions. [2021-11-13 02:36:07,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-13 02:36:07,795 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) Word has length 377 [2021-11-13 02:36:07,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:07,797 INFO L225 Difference]: With dead ends: 246 [2021-11-13 02:36:07,797 INFO L226 Difference]: Without dead ends: 152 [2021-11-13 02:36:07,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 788 GetRequests, 748 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 02:36:07,800 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 340 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 202.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.14ms SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 241.55ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:07,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 92 Invalid, 404 Unknown, 0 Unchecked, 4.14ms Time], IncrementalHoareTripleChecker [179 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 241.55ms Time] [2021-11-13 02:36:07,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-13 02:36:07,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 137. [2021-11-13 02:36:07,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 109 states have (on average 1.0458715596330275) internal successors, (114), 105 states have internal predecessors, (114), 15 states have call successors, (15), 8 states have call predecessors, (15), 12 states have return successors, (57), 23 states have call predecessors, (57), 14 states have call successors, (57) [2021-11-13 02:36:07,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 186 transitions. [2021-11-13 02:36:07,813 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 186 transitions. Word has length 377 [2021-11-13 02:36:07,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:07,813 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 186 transitions. [2021-11-13 02:36:07,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-13 02:36:07,814 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 186 transitions. [2021-11-13 02:36:07,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2021-11-13 02:36:07,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:07,824 INFO L514 BasicCegarLoop]: trace histogram [46, 43, 37, 23, 23, 23, 23, 22, 22, 22, 22, 22, 21, 21, 20, 20, 14, 9, 1, 1, 1, 1] [2021-11-13 02:36:07,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:08,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:08,039 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:08,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:08,040 INFO L85 PathProgramCache]: Analyzing trace with hash 540683272, now seen corresponding path program 5 times [2021-11-13 02:36:08,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:08,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500610905] [2021-11-13 02:36:08,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:08,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:08,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:08,351 INFO L134 CoverageAnalysis]: Checked inductivity of 6835 backedges. 573 proven. 1868 refuted. 0 times theorem prover too weak. 4394 trivial. 0 not checked. [2021-11-13 02:36:08,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:08,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500610905] [2021-11-13 02:36:08,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500610905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:08,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851393818] [2021-11-13 02:36:08,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:08,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:08,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:08,353 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:08,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 02:36:08,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-13 02:36:08,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:08,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-13 02:36:08,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:09,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6835 backedges. 1473 proven. 95 refuted. 0 times theorem prover too weak. 5267 trivial. 0 not checked. [2021-11-13 02:36:09,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:10,570 INFO L134 CoverageAnalysis]: Checked inductivity of 6835 backedges. 1473 proven. 103 refuted. 0 times theorem prover too weak. 5259 trivial. 0 not checked. [2021-11-13 02:36:10,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851393818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:10,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895621073] [2021-11-13 02:36:10,573 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:10,573 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:10,573 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:10,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:10,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10, 13] total 24 [2021-11-13 02:36:10,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430717643] [2021-11-13 02:36:10,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:10,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 02:36:10,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:10,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 02:36:10,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:36:10,578 INFO L87 Difference]: Start difference. First operand 137 states and 186 transitions. Second operand has 24 states, 24 states have (on average 5.416666666666667) internal successors, (130), 24 states have internal predecessors, (130), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (29), 15 states have call predecessors, (29), 15 states have call successors, (29) [2021-11-13 02:36:11,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:11,167 INFO L93 Difference]: Finished difference Result 272 states and 416 transitions. [2021-11-13 02:36:11,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-13 02:36:11,168 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.416666666666667) internal successors, (130), 24 states have internal predecessors, (130), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (29), 15 states have call predecessors, (29), 15 states have call successors, (29) Word has length 437 [2021-11-13 02:36:11,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:11,170 INFO L225 Difference]: With dead ends: 272 [2021-11-13 02:36:11,170 INFO L226 Difference]: Without dead ends: 140 [2021-11-13 02:36:11,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 872 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=481, Invalid=1499, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 02:36:11,173 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 285 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 198.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.12ms SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 244.74ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:11,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 120 Invalid, 485 Unknown, 0 Unchecked, 5.12ms Time], IncrementalHoareTripleChecker [147 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 244.74ms Time] [2021-11-13 02:36:11,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-13 02:36:11,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 122. [2021-11-13 02:36:11,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 98 states have (on average 1.0612244897959184) internal successors, (104), 94 states have internal predecessors, (104), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (30), 17 states have call predecessors, (30), 13 states have call successors, (30) [2021-11-13 02:36:11,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 148 transitions. [2021-11-13 02:36:11,184 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 148 transitions. Word has length 437 [2021-11-13 02:36:11,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:11,185 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 148 transitions. [2021-11-13 02:36:11,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.416666666666667) internal successors, (130), 24 states have internal predecessors, (130), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (29), 15 states have call predecessors, (29), 15 states have call successors, (29) [2021-11-13 02:36:11,185 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 148 transitions. [2021-11-13 02:36:11,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-13 02:36:11,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:11,191 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2021-11-13 02:36:11,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:11,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 02:36:11,419 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:11,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:11,419 INFO L85 PathProgramCache]: Analyzing trace with hash -758504673, now seen corresponding path program 6 times [2021-11-13 02:36:11,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:11,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453536972] [2021-11-13 02:36:11,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:11,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:11,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:11,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 509 proven. 990 refuted. 0 times theorem prover too weak. 1637 trivial. 0 not checked. [2021-11-13 02:36:11,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:11,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453536972] [2021-11-13 02:36:11,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453536972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:11,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12899085] [2021-11-13 02:36:11,626 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:11,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:11,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:11,631 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:11,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 02:36:11,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:11,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:11,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-13 02:36:11,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:12,272 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1778 proven. 484 refuted. 0 times theorem prover too weak. 874 trivial. 0 not checked. [2021-11-13 02:36:12,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:13,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 504 proven. 1101 refuted. 0 times theorem prover too weak. 1531 trivial. 0 not checked. [2021-11-13 02:36:13,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12899085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:13,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [886704325] [2021-11-13 02:36:13,841 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:13,841 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:13,841 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:13,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:13,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 19] total 24 [2021-11-13 02:36:13,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97973941] [2021-11-13 02:36:13,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:13,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 02:36:13,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:13,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 02:36:13,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-13 02:36:13,845 INFO L87 Difference]: Start difference. First operand 122 states and 148 transitions. Second operand has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-13 02:36:14,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:14,262 INFO L93 Difference]: Finished difference Result 234 states and 304 transitions. [2021-11-13 02:36:14,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-13 02:36:14,263 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) Word has length 299 [2021-11-13 02:36:14,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:14,266 INFO L225 Difference]: With dead ends: 234 [2021-11-13 02:36:14,266 INFO L226 Difference]: Without dead ends: 117 [2021-11-13 02:36:14,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 592 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 02:36:14,268 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 190 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 191.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.51ms SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 246.36ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:14,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 141 Invalid, 497 Unknown, 0 Unchecked, 3.51ms Time], IncrementalHoareTripleChecker [144 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 246.36ms Time] [2021-11-13 02:36:14,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-13 02:36:14,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 105. [2021-11-13 02:36:14,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 82 states have internal predecessors, (87), 13 states have call successors, (13), 10 states have call predecessors, (13), 7 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-11-13 02:36:14,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 126 transitions. [2021-11-13 02:36:14,278 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 126 transitions. Word has length 299 [2021-11-13 02:36:14,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:14,278 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 126 transitions. [2021-11-13 02:36:14,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-13 02:36:14,279 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 126 transitions. [2021-11-13 02:36:14,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-13 02:36:14,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:14,282 INFO L514 BasicCegarLoop]: trace histogram [36, 34, 29, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 16, 16, 11, 7, 1, 1, 1, 1] [2021-11-13 02:36:14,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:14,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-13 02:36:14,495 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:14,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:14,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1012331071, now seen corresponding path program 7 times [2021-11-13 02:36:14,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:14,495 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824170125] [2021-11-13 02:36:14,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:14,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:14,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:14,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 764 proven. 1095 refuted. 0 times theorem prover too weak. 2324 trivial. 0 not checked. [2021-11-13 02:36:14,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:14,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824170125] [2021-11-13 02:36:14,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824170125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:14,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490440140] [2021-11-13 02:36:14,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:14,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:14,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:14,725 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:14,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 02:36:14,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:14,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 02:36:14,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:15,470 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1214 refuted. 0 times theorem prover too weak. 2085 trivial. 0 not checked. [2021-11-13 02:36:15,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:17,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1290 refuted. 0 times theorem prover too weak. 2009 trivial. 0 not checked. [2021-11-13 02:36:17,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490440140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:17,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2146805343] [2021-11-13 02:36:17,507 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:17,507 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:17,508 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:17,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:17,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-13 02:36:17,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250996032] [2021-11-13 02:36:17,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:17,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 02:36:17,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:17,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 02:36:17,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-13 02:36:17,519 INFO L87 Difference]: Start difference. First operand 105 states and 126 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-13 02:36:18,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:18,138 INFO L93 Difference]: Finished difference Result 223 states and 281 transitions. [2021-11-13 02:36:18,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 02:36:18,139 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 344 [2021-11-13 02:36:18,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:18,141 INFO L225 Difference]: With dead ends: 223 [2021-11-13 02:36:18,141 INFO L226 Difference]: Without dead ends: 123 [2021-11-13 02:36:18,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 680 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 02:36:18,143 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 347 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 306.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.51ms SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 375.72ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:18,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [347 Valid, 205 Invalid, 820 Unknown, 0 Unchecked, 5.51ms Time], IncrementalHoareTripleChecker [244 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 375.72ms Time] [2021-11-13 02:36:18,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-13 02:36:18,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 111. [2021-11-13 02:36:18,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 87 states have internal predecessors, (92), 14 states have call successors, (14), 11 states have call predecessors, (14), 7 states have return successors, (28), 12 states have call predecessors, (28), 13 states have call successors, (28) [2021-11-13 02:36:18,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2021-11-13 02:36:18,158 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 344 [2021-11-13 02:36:18,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:18,159 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2021-11-13 02:36:18,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-13 02:36:18,160 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2021-11-13 02:36:18,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 764 [2021-11-13 02:36:18,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:18,168 INFO L514 BasicCegarLoop]: trace histogram [80, 75, 65, 41, 41, 41, 41, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2021-11-13 02:36:18,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:18,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-13 02:36:18,383 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:18,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:18,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1445636506, now seen corresponding path program 8 times [2021-11-13 02:36:18,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:18,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845910033] [2021-11-13 02:36:18,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:18,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:18,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:18,769 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 1123 proven. 4086 refuted. 0 times theorem prover too weak. 15975 trivial. 0 not checked. [2021-11-13 02:36:18,769 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:18,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845910033] [2021-11-13 02:36:18,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845910033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:18,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394216689] [2021-11-13 02:36:18,770 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:18,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:18,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:18,771 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:18,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 02:36:19,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-13 02:36:19,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:19,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-13 02:36:19,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:20,714 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 6000 proven. 1712 refuted. 0 times theorem prover too weak. 13472 trivial. 0 not checked. [2021-11-13 02:36:20,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:28,729 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 6467 proven. 1550 refuted. 0 times theorem prover too weak. 13167 trivial. 0 not checked. [2021-11-13 02:36:28,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394216689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:28,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433319110] [2021-11-13 02:36:28,732 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:28,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:28,733 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:28,735 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:28,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 32] total 55 [2021-11-13 02:36:28,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169173242] [2021-11-13 02:36:28,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:28,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-13 02:36:28,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:28,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-13 02:36:28,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=2567, Unknown=0, NotChecked=0, Total=2970 [2021-11-13 02:36:28,742 INFO L87 Difference]: Start difference. First operand 111 states and 134 transitions. Second operand has 55 states, 55 states have (on average 3.381818181818182) internal successors, (186), 55 states have internal predecessors, (186), 22 states have call successors, (26), 4 states have call predecessors, (26), 19 states have return successors, (44), 38 states have call predecessors, (44), 19 states have call successors, (44) [2021-11-13 02:36:30,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:30,390 INFO L93 Difference]: Finished difference Result 290 states and 396 transitions. [2021-11-13 02:36:30,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-13 02:36:30,390 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.381818181818182) internal successors, (186), 55 states have internal predecessors, (186), 22 states have call successors, (26), 4 states have call predecessors, (26), 19 states have return successors, (44), 38 states have call predecessors, (44), 19 states have call successors, (44) Word has length 763 [2021-11-13 02:36:30,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:30,393 INFO L225 Difference]: With dead ends: 290 [2021-11-13 02:36:30,393 INFO L226 Difference]: Without dead ends: 184 [2021-11-13 02:36:30,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1600 GetRequests, 1500 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3263 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1637, Invalid=8665, Unknown=0, NotChecked=0, Total=10302 [2021-11-13 02:36:30,399 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 319 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 917 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 405.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.50ms SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 504.08ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:30,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [319 Valid, 137 Invalid, 1090 Unknown, 0 Unchecked, 6.50ms Time], IncrementalHoareTripleChecker [173 Valid, 917 Invalid, 0 Unknown, 0 Unchecked, 504.08ms Time] [2021-11-13 02:36:30,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-13 02:36:30,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 144. [2021-11-13 02:36:30,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 113 states have internal predecessors, (118), 18 states have call successors, (18), 12 states have call predecessors, (18), 10 states have return successors, (55), 18 states have call predecessors, (55), 17 states have call successors, (55) [2021-11-13 02:36:30,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2021-11-13 02:36:30,414 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 763 [2021-11-13 02:36:30,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:30,417 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2021-11-13 02:36:30,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.381818181818182) internal successors, (186), 55 states have internal predecessors, (186), 22 states have call successors, (26), 4 states have call predecessors, (26), 19 states have return successors, (44), 38 states have call predecessors, (44), 19 states have call successors, (44) [2021-11-13 02:36:30,418 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2021-11-13 02:36:30,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1235 [2021-11-13 02:36:30,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:30,432 INFO L514 BasicCegarLoop]: trace histogram [128, 123, 104, 65, 65, 65, 65, 62, 62, 62, 62, 62, 61, 61, 60, 60, 39, 24, 1, 1, 1, 1] [2021-11-13 02:36:30,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:30,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-13 02:36:30,659 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:30,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:30,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1823166736, now seen corresponding path program 9 times [2021-11-13 02:36:30,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:30,659 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009113432] [2021-11-13 02:36:30,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:30,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:30,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:31,299 INFO L134 CoverageAnalysis]: Checked inductivity of 55852 backedges. 2055 proven. 8179 refuted. 0 times theorem prover too weak. 45618 trivial. 0 not checked. [2021-11-13 02:36:31,299 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:31,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009113432] [2021-11-13 02:36:31,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009113432] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:31,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752727433] [2021-11-13 02:36:31,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:31,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:31,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:31,303 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:31,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 02:36:31,661 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:31,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:31,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 1537 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 02:36:31,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:33,514 INFO L134 CoverageAnalysis]: Checked inductivity of 55852 backedges. 26981 proven. 5467 refuted. 0 times theorem prover too weak. 23404 trivial. 0 not checked. [2021-11-13 02:36:33,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:37,379 INFO L134 CoverageAnalysis]: Checked inductivity of 55852 backedges. 2440 proven. 9781 refuted. 0 times theorem prover too weak. 43631 trivial. 0 not checked. [2021-11-13 02:36:37,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752727433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:37,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881360279] [2021-11-13 02:36:37,383 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:37,383 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:37,383 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:37,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:37,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 27] total 32 [2021-11-13 02:36:37,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656727410] [2021-11-13 02:36:37,386 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:37,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-13 02:36:37,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:37,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-13 02:36:37,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2021-11-13 02:36:37,391 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-13 02:36:38,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:38,191 INFO L93 Difference]: Finished difference Result 334 states and 486 transitions. [2021-11-13 02:36:38,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 02:36:38,192 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) Word has length 1234 [2021-11-13 02:36:38,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:38,195 INFO L225 Difference]: With dead ends: 334 [2021-11-13 02:36:38,196 INFO L226 Difference]: Without dead ends: 195 [2021-11-13 02:36:38,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2526 GetRequests, 2466 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=963, Invalid=2577, Unknown=0, NotChecked=0, Total=3540 [2021-11-13 02:36:38,200 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 795 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 406 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 260.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 795 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.98ms SdHoareTripleChecker+Time, 406 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 332.88ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:38,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [795 Valid, 125 Invalid, 731 Unknown, 0 Unchecked, 3.98ms Time], IncrementalHoareTripleChecker [406 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 332.88ms Time] [2021-11-13 02:36:38,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-13 02:36:38,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 182. [2021-11-13 02:36:38,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 147 states have (on average 1.034013605442177) internal successors, (152), 143 states have internal predecessors, (152), 23 states have call successors, (23), 17 states have call predecessors, (23), 11 states have return successors, (64), 21 states have call predecessors, (64), 22 states have call successors, (64) [2021-11-13 02:36:38,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 239 transitions. [2021-11-13 02:36:38,215 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 239 transitions. Word has length 1234 [2021-11-13 02:36:38,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:38,216 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 239 transitions. [2021-11-13 02:36:38,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-13 02:36:38,217 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 239 transitions. [2021-11-13 02:36:38,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 967 [2021-11-13 02:36:38,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:38,227 INFO L514 BasicCegarLoop]: trace histogram [99, 98, 80, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 48, 48, 31, 19, 1, 1, 1, 1] [2021-11-13 02:36:38,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:38,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:38,451 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:38,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:38,451 INFO L85 PathProgramCache]: Analyzing trace with hash -106641351, now seen corresponding path program 10 times [2021-11-13 02:36:38,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:38,451 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286691617] [2021-11-13 02:36:38,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:38,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:38,947 INFO L134 CoverageAnalysis]: Checked inductivity of 34080 backedges. 3203 proven. 6227 refuted. 0 times theorem prover too weak. 24650 trivial. 0 not checked. [2021-11-13 02:36:38,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:38,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286691617] [2021-11-13 02:36:38,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286691617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:38,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79668008] [2021-11-13 02:36:38,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:36:38,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:38,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:38,949 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:38,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 02:36:39,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:39,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 1817 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-13 02:36:39,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:40,915 INFO L134 CoverageAnalysis]: Checked inductivity of 34080 backedges. 18655 proven. 2667 refuted. 0 times theorem prover too weak. 12758 trivial. 0 not checked. [2021-11-13 02:36:40,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:46,061 INFO L134 CoverageAnalysis]: Checked inductivity of 34080 backedges. 2659 proven. 6933 refuted. 0 times theorem prover too weak. 24488 trivial. 0 not checked. [2021-11-13 02:36:46,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79668008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:46,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324264738] [2021-11-13 02:36:46,064 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:46,064 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:46,064 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:46,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:46,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 29 [2021-11-13 02:36:46,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170124926] [2021-11-13 02:36:46,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:46,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 02:36:46,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:46,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 02:36:46,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2021-11-13 02:36:46,081 INFO L87 Difference]: Start difference. First operand 182 states and 239 transitions. Second operand has 29 states, 29 states have (on average 6.310344827586207) internal successors, (183), 29 states have internal predecessors, (183), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) [2021-11-13 02:36:46,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:46,752 INFO L93 Difference]: Finished difference Result 360 states and 489 transitions. [2021-11-13 02:36:46,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 02:36:46,753 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 6.310344827586207) internal successors, (183), 29 states have internal predecessors, (183), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) Word has length 966 [2021-11-13 02:36:46,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:46,756 INFO L225 Difference]: With dead ends: 360 [2021-11-13 02:36:46,757 INFO L226 Difference]: Without dead ends: 183 [2021-11-13 02:36:46,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1976 GetRequests, 1929 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=560, Invalid=1602, Unknown=0, NotChecked=0, Total=2162 [2021-11-13 02:36:46,760 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 461 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 372.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 461 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.35ms SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 447.59ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:46,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [461 Valid, 204 Invalid, 956 Unknown, 0 Unchecked, 5.35ms Time], IncrementalHoareTripleChecker [377 Valid, 579 Invalid, 0 Unknown, 0 Unchecked, 447.59ms Time] [2021-11-13 02:36:46,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-13 02:36:46,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 147. [2021-11-13 02:36:46,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 116 states have internal predecessors, (121), 19 states have call successors, (19), 14 states have call predecessors, (19), 9 states have return successors, (45), 16 states have call predecessors, (45), 18 states have call successors, (45) [2021-11-13 02:36:46,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 185 transitions. [2021-11-13 02:36:46,776 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 185 transitions. Word has length 966 [2021-11-13 02:36:46,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:46,779 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 185 transitions. [2021-11-13 02:36:46,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 6.310344827586207) internal successors, (183), 29 states have internal predecessors, (183), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) [2021-11-13 02:36:46,779 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 185 transitions. [2021-11-13 02:36:46,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1326 [2021-11-13 02:36:46,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:46,796 INFO L514 BasicCegarLoop]: trace histogram [136, 134, 110, 68, 68, 68, 68, 67, 67, 67, 67, 67, 67, 67, 66, 66, 42, 26, 1, 1, 1, 1] [2021-11-13 02:36:46,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:47,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:47,011 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:47,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:47,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1320735689, now seen corresponding path program 11 times [2021-11-13 02:36:47,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:47,011 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084820634] [2021-11-13 02:36:47,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:47,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:47,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:47,857 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 4508 proven. 10243 refuted. 0 times theorem prover too weak. 49671 trivial. 0 not checked. [2021-11-13 02:36:47,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:47,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084820634] [2021-11-13 02:36:47,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084820634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:47,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950501283] [2021-11-13 02:36:47,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:47,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:47,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:47,859 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:47,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 02:36:48,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-13 02:36:48,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:48,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 1479 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-13 02:36:48,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:50,466 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 5069 proven. 8146 refuted. 0 times theorem prover too weak. 51207 trivial. 0 not checked. [2021-11-13 02:36:50,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:55,471 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 5069 proven. 8311 refuted. 0 times theorem prover too weak. 51042 trivial. 0 not checked. [2021-11-13 02:36:55,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950501283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:55,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [749796480] [2021-11-13 02:36:55,474 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:36:55,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:55,475 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:36:55,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:55,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18, 29] total 36 [2021-11-13 02:36:55,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211068383] [2021-11-13 02:36:55,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:55,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-13 02:36:55,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:55,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-13 02:36:55,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1050, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 02:36:55,484 INFO L87 Difference]: Start difference. First operand 147 states and 185 transitions. Second operand has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 28 states have call successors, (35), 1 states have call predecessors, (35), 16 states have return successors, (48), 21 states have call predecessors, (48), 28 states have call successors, (48) [2021-11-13 02:36:56,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:56,690 INFO L93 Difference]: Finished difference Result 355 states and 490 transitions. [2021-11-13 02:36:56,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-13 02:36:56,691 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 28 states have call successors, (35), 1 states have call predecessors, (35), 16 states have return successors, (48), 21 states have call predecessors, (48), 28 states have call successors, (48) Word has length 1325 [2021-11-13 02:36:56,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:56,695 INFO L225 Difference]: With dead ends: 355 [2021-11-13 02:36:56,695 INFO L226 Difference]: Without dead ends: 213 [2021-11-13 02:36:56,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2720 GetRequests, 2648 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1114 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1209, Invalid=3903, Unknown=0, NotChecked=0, Total=5112 [2021-11-13 02:36:56,699 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 885 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 707 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 521.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 885 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 1494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.73ms SdHoareTripleChecker+Time, 707 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 630.16ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:56,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [885 Valid, 240 Invalid, 1494 Unknown, 0 Unchecked, 6.73ms Time], IncrementalHoareTripleChecker [707 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 630.16ms Time] [2021-11-13 02:36:56,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-13 02:36:56,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 189. [2021-11-13 02:36:56,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 150 states have internal predecessors, (158), 25 states have call successors, (25), 20 states have call predecessors, (25), 10 states have return successors, (63), 18 states have call predecessors, (63), 24 states have call successors, (63) [2021-11-13 02:36:56,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 246 transitions. [2021-11-13 02:36:56,714 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 246 transitions. Word has length 1325 [2021-11-13 02:36:56,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:56,715 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 246 transitions. [2021-11-13 02:36:56,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 28 states have call successors, (35), 1 states have call predecessors, (35), 16 states have return successors, (48), 21 states have call predecessors, (48), 28 states have call successors, (48) [2021-11-13 02:36:56,716 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 246 transitions. [2021-11-13 02:36:56,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 908 [2021-11-13 02:36:56,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:56,725 INFO L514 BasicCegarLoop]: trace histogram [93, 92, 75, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 45, 45, 29, 18, 1, 1, 1, 1] [2021-11-13 02:36:56,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:56,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-13 02:36:56,939 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:36:56,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:56,939 INFO L85 PathProgramCache]: Analyzing trace with hash -1937754584, now seen corresponding path program 12 times [2021-11-13 02:36:56,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:56,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184763293] [2021-11-13 02:36:56,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:56,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:57,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:57,405 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3304 proven. 5088 refuted. 0 times theorem prover too weak. 21616 trivial. 0 not checked. [2021-11-13 02:36:57,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:57,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184763293] [2021-11-13 02:36:57,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184763293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:57,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708850366] [2021-11-13 02:36:57,406 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:57,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:57,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:57,411 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:57,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 02:36:57,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:57,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:57,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 02:36:57,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:59,241 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3735 proven. 5527 refuted. 0 times theorem prover too weak. 20746 trivial. 0 not checked. [2021-11-13 02:36:59,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:03,415 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3735 proven. 5699 refuted. 0 times theorem prover too weak. 20574 trivial. 0 not checked. [2021-11-13 02:37:03,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708850366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:03,415 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189292686] [2021-11-13 02:37:03,419 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:37:03,419 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:03,420 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:37:03,421 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:03,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 31] total 36 [2021-11-13 02:37:03,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575102757] [2021-11-13 02:37:03,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:03,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-13 02:37:03,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:03,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-13 02:37:03,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 02:37:03,426 INFO L87 Difference]: Start difference. First operand 189 states and 246 transitions. Second operand has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) [2021-11-13 02:37:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:04,315 INFO L93 Difference]: Finished difference Result 398 states and 537 transitions. [2021-11-13 02:37:04,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-13 02:37:04,316 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) Word has length 907 [2021-11-13 02:37:04,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:04,320 INFO L225 Difference]: With dead ends: 398 [2021-11-13 02:37:04,320 INFO L226 Difference]: Without dead ends: 214 [2021-11-13 02:37:04,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1806 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=805, Invalid=2387, Unknown=0, NotChecked=0, Total=3192 [2021-11-13 02:37:04,324 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 556 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 883 mSolverCounterSat, 684 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 470.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 1567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.65ms SdHoareTripleChecker+Time, 684 IncrementalHoareTripleChecker+Valid, 883 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 592.12ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:04,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [556 Valid, 292 Invalid, 1567 Unknown, 0 Unchecked, 5.65ms Time], IncrementalHoareTripleChecker [684 Valid, 883 Invalid, 0 Unknown, 0 Unchecked, 592.12ms Time] [2021-11-13 02:37:04,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-13 02:37:04,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 166. [2021-11-13 02:37:04,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 133 states have (on average 1.0225563909774436) internal successors, (136), 132 states have internal predecessors, (136), 22 states have call successors, (22), 16 states have call predecessors, (22), 10 states have return successors, (56), 17 states have call predecessors, (56), 21 states have call successors, (56) [2021-11-13 02:37:04,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 214 transitions. [2021-11-13 02:37:04,338 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 214 transitions. Word has length 907 [2021-11-13 02:37:04,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:04,339 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 214 transitions. [2021-11-13 02:37:04,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) [2021-11-13 02:37:04,340 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 214 transitions. [2021-11-13 02:37:04,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1065 [2021-11-13 02:37:04,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:04,374 INFO L514 BasicCegarLoop]: trace histogram [109, 108, 88, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 53, 53, 34, 21, 1, 1, 1, 1] [2021-11-13 02:37:04,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:04,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-13 02:37:04,591 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:37:04,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:04,592 INFO L85 PathProgramCache]: Analyzing trace with hash -2147256016, now seen corresponding path program 13 times [2021-11-13 02:37:04,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:04,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798712153] [2021-11-13 02:37:04,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:04,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:04,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:05,852 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6794 proven. 10214 refuted. 0 times theorem prover too weak. 24405 trivial. 0 not checked. [2021-11-13 02:37:05,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:05,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798712153] [2021-11-13 02:37:05,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798712153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:05,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892233824] [2021-11-13 02:37:05,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:37:05,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:05,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:05,853 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:05,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 02:37:06,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:06,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1998 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-13 02:37:06,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:08,983 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6686 proven. 7802 refuted. 0 times theorem prover too weak. 26925 trivial. 0 not checked. [2021-11-13 02:37:08,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:36,333 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 7863 proven. 7339 refuted. 0 times theorem prover too weak. 26211 trivial. 0 not checked. [2021-11-13 02:37:36,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892233824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:36,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749753285] [2021-11-13 02:37:36,335 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:37:36,335 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:36,336 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:37:36,337 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:36,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 41] total 59 [2021-11-13 02:37:36,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914364887] [2021-11-13 02:37:36,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:36,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-13 02:37:36,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:36,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-13 02:37:36,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=2770, Unknown=0, NotChecked=0, Total=3540 [2021-11-13 02:37:36,343 INFO L87 Difference]: Start difference. First operand 166 states and 214 transitions. Second operand has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-13 02:37:36,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:36,631 INFO L93 Difference]: Finished difference Result 197 states and 270 transitions. [2021-11-13 02:37:36,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-13 02:37:36,632 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) Word has length 1064 [2021-11-13 02:37:36,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:36,636 INFO L225 Difference]: With dead ends: 197 [2021-11-13 02:37:36,636 INFO L226 Difference]: Without dead ends: 196 [2021-11-13 02:37:36,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2347 GetRequests, 2285 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=871, Invalid=3161, Unknown=0, NotChecked=0, Total=4032 [2021-11-13 02:37:36,639 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 81 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 142.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.85ms SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 188.82ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:36,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 324 Invalid, 326 Unknown, 0 Unchecked, 2.85ms Time], IncrementalHoareTripleChecker [44 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 188.82ms Time] [2021-11-13 02:37:36,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-13 02:37:36,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 186. [2021-11-13 02:37:36,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 147 states have internal predecessors, (152), 24 states have call successors, (24), 16 states have call predecessors, (24), 12 states have return successors, (80), 22 states have call predecessors, (80), 23 states have call successors, (80) [2021-11-13 02:37:36,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 256 transitions. [2021-11-13 02:37:36,655 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 256 transitions. Word has length 1064 [2021-11-13 02:37:36,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:36,656 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 256 transitions. [2021-11-13 02:37:36,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-13 02:37:36,656 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 256 transitions. [2021-11-13 02:37:36,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2150 [2021-11-13 02:37:36,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:36,695 INFO L514 BasicCegarLoop]: trace histogram [220, 218, 178, 110, 110, 110, 110, 109, 109, 109, 109, 109, 109, 109, 108, 108, 68, 42, 1, 1, 1, 1] [2021-11-13 02:37:36,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:36,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:36,915 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:37:36,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:36,915 INFO L85 PathProgramCache]: Analyzing trace with hash 91315753, now seen corresponding path program 14 times [2021-11-13 02:37:36,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:36,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419444527] [2021-11-13 02:37:36,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:36,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:37,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:38,327 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8611 proven. 19696 refuted. 0 times theorem prover too weak. 142011 trivial. 0 not checked. [2021-11-13 02:37:38,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:38,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419444527] [2021-11-13 02:37:38,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419444527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:38,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177313051] [2021-11-13 02:37:38,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:37:38,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:38,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:38,330 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:38,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 02:37:39,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 80 check-sat command(s) [2021-11-13 02:37:39,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:39,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 2098 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 02:37:39,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:42,550 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8641 proven. 15301 refuted. 0 times theorem prover too weak. 146376 trivial. 0 not checked. [2021-11-13 02:37:42,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:49,981 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8641 proven. 15515 refuted. 0 times theorem prover too weak. 146162 trivial. 0 not checked. [2021-11-13 02:37:49,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177313051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:49,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [587699327] [2021-11-13 02:37:49,985 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:37:49,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:49,985 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:37:49,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:49,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 31] total 40 [2021-11-13 02:37:49,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313932081] [2021-11-13 02:37:49,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:49,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-13 02:37:49,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:49,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-13 02:37:49,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1306, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 02:37:49,992 INFO L87 Difference]: Start difference. First operand 186 states and 256 transitions. Second operand has 40 states, 40 states have (on average 5.675) internal successors, (227), 40 states have internal predecessors, (227), 30 states have call successors, (38), 1 states have call predecessors, (38), 19 states have return successors, (54), 25 states have call predecessors, (54), 30 states have call successors, (54) [2021-11-13 02:37:51,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:51,578 INFO L93 Difference]: Finished difference Result 430 states and 657 transitions. [2021-11-13 02:37:51,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-13 02:37:51,579 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.675) internal successors, (227), 40 states have internal predecessors, (227), 30 states have call successors, (38), 1 states have call predecessors, (38), 19 states have return successors, (54), 25 states have call predecessors, (54), 30 states have call successors, (54) Word has length 2149 [2021-11-13 02:37:51,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:51,584 INFO L225 Difference]: With dead ends: 430 [2021-11-13 02:37:51,585 INFO L226 Difference]: Without dead ends: 249 [2021-11-13 02:37:51,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4377 GetRequests, 4296 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1465 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1500, Invalid=4980, Unknown=0, NotChecked=0, Total=6480 [2021-11-13 02:37:51,591 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 1410 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 950 mSolverCounterSat, 1281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 760.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1410 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 2231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.66ms SdHoareTripleChecker+Time, 1281 IncrementalHoareTripleChecker+Valid, 950 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 925.18ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:51,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1410 Valid, 279 Invalid, 2231 Unknown, 0 Unchecked, 8.66ms Time], IncrementalHoareTripleChecker [1281 Valid, 950 Invalid, 0 Unknown, 0 Unchecked, 925.18ms Time] [2021-11-13 02:37:51,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-13 02:37:51,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 236. [2021-11-13 02:37:51,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 191 states have (on average 1.0261780104712042) internal successors, (196), 187 states have internal predecessors, (196), 31 states have call successors, (31), 23 states have call predecessors, (31), 13 states have return successors, (95), 25 states have call predecessors, (95), 30 states have call successors, (95) [2021-11-13 02:37:51,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 322 transitions. [2021-11-13 02:37:51,610 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 322 transitions. Word has length 2149 [2021-11-13 02:37:51,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:51,612 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 322 transitions. [2021-11-13 02:37:51,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.675) internal successors, (227), 40 states have internal predecessors, (227), 30 states have call successors, (38), 1 states have call predecessors, (38), 19 states have return successors, (54), 25 states have call predecessors, (54), 30 states have call successors, (54) [2021-11-13 02:37:51,613 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 322 transitions. [2021-11-13 02:37:51,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2150 [2021-11-13 02:37:51,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:51,650 INFO L514 BasicCegarLoop]: trace histogram [220, 218, 178, 110, 110, 110, 110, 109, 109, 109, 109, 109, 109, 109, 108, 108, 68, 42, 1, 1, 1, 1] [2021-11-13 02:37:51,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:51,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-13 02:37:51,866 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:37:51,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:51,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1909203223, now seen corresponding path program 15 times [2021-11-13 02:37:51,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:51,867 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217994441] [2021-11-13 02:37:51,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:51,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:52,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:53,308 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8354 proven. 19339 refuted. 0 times theorem prover too weak. 142625 trivial. 0 not checked. [2021-11-13 02:37:53,309 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:53,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217994441] [2021-11-13 02:37:53,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217994441] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:53,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187789005] [2021-11-13 02:37:53,310 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:37:53,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:53,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:53,315 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:53,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 02:37:54,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:37:54,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:54,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 2663 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-13 02:37:54,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:57,516 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 80420 proven. 10882 refuted. 0 times theorem prover too weak. 79016 trivial. 0 not checked. [2021-11-13 02:37:57,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:06,528 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8339 proven. 20314 refuted. 0 times theorem prover too weak. 141665 trivial. 0 not checked. [2021-11-13 02:38:06,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187789005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:06,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [955468407] [2021-11-13 02:38:06,531 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:38:06,531 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:06,531 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:38:06,532 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:06,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 35] total 40 [2021-11-13 02:38:06,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536198536] [2021-11-13 02:38:06,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:06,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-13 02:38:06,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:06,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-13 02:38:06,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 02:38:06,537 INFO L87 Difference]: Start difference. First operand 236 states and 322 transitions. Second operand has 40 states, 40 states have (on average 5.75) internal successors, (230), 40 states have internal predecessors, (230), 34 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 34 states have call successors, (52) [2021-11-13 02:38:07,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:07,610 INFO L93 Difference]: Finished difference Result 480 states and 673 transitions. [2021-11-13 02:38:07,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-13 02:38:07,611 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.75) internal successors, (230), 40 states have internal predecessors, (230), 34 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 34 states have call successors, (52) Word has length 2149 [2021-11-13 02:38:07,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:07,616 INFO L225 Difference]: With dead ends: 480 [2021-11-13 02:38:07,616 INFO L226 Difference]: Without dead ends: 249 [2021-11-13 02:38:07,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4356 GetRequests, 4292 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=999, Invalid=3033, Unknown=0, NotChecked=0, Total=4032 [2021-11-13 02:38:07,620 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 951 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 868 mSolverCounterSat, 963 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 555.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 951 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.48ms SdHoareTripleChecker+Time, 963 IncrementalHoareTripleChecker+Valid, 868 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 702.51ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:07,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [951 Valid, 277 Invalid, 1831 Unknown, 0 Unchecked, 6.48ms Time], IncrementalHoareTripleChecker [963 Valid, 868 Invalid, 0 Unknown, 0 Unchecked, 702.51ms Time] [2021-11-13 02:38:07,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-13 02:38:07,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 189. [2021-11-13 02:38:07,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 152 states have (on average 1.019736842105263) internal successors, (155), 150 states have internal predecessors, (155), 25 states have call successors, (25), 18 states have call predecessors, (25), 11 states have return successors, (68), 20 states have call predecessors, (68), 24 states have call successors, (68) [2021-11-13 02:38:07,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 248 transitions. [2021-11-13 02:38:07,635 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 248 transitions. Word has length 2149 [2021-11-13 02:38:07,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:07,637 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 248 transitions. [2021-11-13 02:38:07,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.75) internal successors, (230), 40 states have internal predecessors, (230), 34 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 34 states have call successors, (52) [2021-11-13 02:38:07,638 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 248 transitions. [2021-11-13 02:38:07,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3484 [2021-11-13 02:38:07,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:07,728 INFO L514 BasicCegarLoop]: trace histogram [356, 354, 288, 178, 178, 178, 178, 177, 177, 177, 177, 177, 177, 177, 176, 176, 110, 68, 1, 1, 1, 1] [2021-11-13 02:38:07,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-13 02:38:07,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:07,929 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:38:07,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:07,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1237945431, now seen corresponding path program 16 times [2021-11-13 02:38:07,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:07,930 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952568388] [2021-11-13 02:38:07,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:07,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:08,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:10,449 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 15997 proven. 36900 refuted. 0 times theorem prover too weak. 395888 trivial. 0 not checked. [2021-11-13 02:38:10,450 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:10,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952568388] [2021-11-13 02:38:10,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952568388] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:10,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464048332] [2021-11-13 02:38:10,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:38:10,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:10,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:10,455 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:10,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 02:38:12,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:12,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 6465 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-13 02:38:12,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:16,687 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 18068 proven. 38879 refuted. 0 times theorem prover too weak. 391838 trivial. 0 not checked. [2021-11-13 02:38:16,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:30,622 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 18068 proven. 39266 refuted. 0 times theorem prover too weak. 391451 trivial. 0 not checked. [2021-11-13 02:38:30,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464048332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:30,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727877049] [2021-11-13 02:38:30,625 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:38:30,625 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:30,626 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:38:30,626 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:30,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 43] total 48 [2021-11-13 02:38:30,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372665260] [2021-11-13 02:38:30,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:30,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-13 02:38:30,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:30,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-13 02:38:30,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1907, Unknown=0, NotChecked=0, Total=2256 [2021-11-13 02:38:30,635 INFO L87 Difference]: Start difference. First operand 189 states and 248 transitions. Second operand has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) [2021-11-13 02:38:32,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:32,456 INFO L93 Difference]: Finished difference Result 440 states and 643 transitions. [2021-11-13 02:38:32,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-13 02:38:32,457 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) Word has length 3483 [2021-11-13 02:38:32,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:32,462 INFO L225 Difference]: With dead ends: 440 [2021-11-13 02:38:32,462 INFO L226 Difference]: Without dead ends: 256 [2021-11-13 02:38:32,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7054 GetRequests, 6960 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1996 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2024, Invalid=6718, Unknown=0, NotChecked=0, Total=8742 [2021-11-13 02:38:32,467 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 1556 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 1023 mSolverCounterSat, 1752 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 857.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1556 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 2775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.78ms SdHoareTripleChecker+Time, 1752 IncrementalHoareTripleChecker+Valid, 1023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1039.52ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:32,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1556 Valid, 283 Invalid, 2775 Unknown, 0 Unchecked, 7.78ms Time], IncrementalHoareTripleChecker [1752 Valid, 1023 Invalid, 0 Unknown, 0 Unchecked, 1039.52ms Time] [2021-11-13 02:38:32,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-13 02:38:32,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 243. [2021-11-13 02:38:32,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 197 states have (on average 1.0253807106598984) internal successors, (202), 194 states have internal predecessors, (202), 33 states have call successors, (33), 26 states have call predecessors, (33), 12 states have return successors, (92), 22 states have call predecessors, (92), 32 states have call successors, (92) [2021-11-13 02:38:32,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 327 transitions. [2021-11-13 02:38:32,485 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 327 transitions. Word has length 3483 [2021-11-13 02:38:32,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:32,487 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 327 transitions. [2021-11-13 02:38:32,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) [2021-11-13 02:38:32,488 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 327 transitions. [2021-11-13 02:38:32,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2399 [2021-11-13 02:38:32,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:32,534 INFO L514 BasicCegarLoop]: trace histogram [245, 244, 198, 122, 122, 122, 122, 122, 122, 122, 122, 122, 122, 122, 121, 121, 76, 47, 1, 1, 1, 1] [2021-11-13 02:38:32,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-13 02:38:32,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-13 02:38:32,759 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:38:32,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:32,759 INFO L85 PathProgramCache]: Analyzing trace with hash -6182688, now seen corresponding path program 17 times [2021-11-13 02:38:32,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:32,759 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280848822] [2021-11-13 02:38:32,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:32,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:33,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:34,093 INFO L134 CoverageAnalysis]: Checked inductivity of 212264 backedges. 12461 proven. 19385 refuted. 0 times theorem prover too weak. 180418 trivial. 0 not checked. [2021-11-13 02:38:34,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:34,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280848822] [2021-11-13 02:38:34,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280848822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:34,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315557311] [2021-11-13 02:38:34,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:38:34,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:34,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:34,096 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:34,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 02:38:35,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-13 02:38:35,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:35,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 1471 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-13 02:38:35,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:38,498 INFO L134 CoverageAnalysis]: Checked inductivity of 212264 backedges. 10863 proven. 16946 refuted. 0 times theorem prover too weak. 184455 trivial. 0 not checked. [2021-11-13 02:38:38,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:47,271 INFO L134 CoverageAnalysis]: Checked inductivity of 212264 backedges. 10855 proven. 17160 refuted. 0 times theorem prover too weak. 184249 trivial. 0 not checked. [2021-11-13 02:38:47,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315557311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:38:47,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1334696419] [2021-11-13 02:38:47,274 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:38:47,274 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:47,274 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:38:47,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:38:47,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 20, 32] total 42 [2021-11-13 02:38:47,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214312270] [2021-11-13 02:38:47,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:47,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-13 02:38:47,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:47,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-13 02:38:47,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1418, Unknown=0, NotChecked=0, Total=1722 [2021-11-13 02:38:47,280 INFO L87 Difference]: Start difference. First operand 243 states and 327 transitions. Second operand has 42 states, 42 states have (on average 5.5476190476190474) internal successors, (233), 42 states have internal predecessors, (233), 31 states have call successors, (40), 1 states have call predecessors, (40), 19 states have return successors, (56), 25 states have call predecessors, (56), 31 states have call successors, (56) [2021-11-13 02:38:48,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:48,225 INFO L93 Difference]: Finished difference Result 518 states and 719 transitions. [2021-11-13 02:38:48,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 02:38:48,226 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.5476190476190474) internal successors, (233), 42 states have internal predecessors, (233), 31 states have call successors, (40), 1 states have call predecessors, (40), 19 states have return successors, (56), 25 states have call predecessors, (56), 31 states have call successors, (56) Word has length 2398 [2021-11-13 02:38:48,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:48,230 INFO L225 Difference]: With dead ends: 518 [2021-11-13 02:38:48,230 INFO L226 Difference]: Without dead ends: 280 [2021-11-13 02:38:48,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4859 GetRequests, 4779 SyntacticMatches, 13 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1364 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1135, Invalid=3557, Unknown=0, NotChecked=0, Total=4692 [2021-11-13 02:38:48,234 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 742 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 994 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 742 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 1658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.25ms SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 994 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 575.89ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:48,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [742 Valid, 319 Invalid, 1658 Unknown, 0 Unchecked, 4.25ms Time], IncrementalHoareTripleChecker [664 Valid, 994 Invalid, 0 Unknown, 0 Unchecked, 575.89ms Time] [2021-11-13 02:38:48,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-13 02:38:48,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 208. [2021-11-13 02:38:48,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 167 states have (on average 1.0179640718562875) internal successors, (170), 166 states have internal predecessors, (170), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (81), 21 states have call predecessors, (81), 27 states have call successors, (81) [2021-11-13 02:38:48,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 279 transitions. [2021-11-13 02:38:48,251 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 279 transitions. Word has length 2398 [2021-11-13 02:38:48,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:48,253 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 279 transitions. [2021-11-13 02:38:48,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.5476190476190474) internal successors, (233), 42 states have internal predecessors, (233), 31 states have call successors, (40), 1 states have call predecessors, (40), 19 states have return successors, (56), 25 states have call predecessors, (56), 31 states have call successors, (56) [2021-11-13 02:38:48,253 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 279 transitions. [2021-11-13 02:38:48,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2811 [2021-11-13 02:38:48,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:48,314 INFO L514 BasicCegarLoop]: trace histogram [287, 286, 232, 143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 142, 142, 89, 55, 1, 1, 1, 1] [2021-11-13 02:38:48,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 02:38:48,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-13 02:38:48,535 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:38:48,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:48,536 INFO L85 PathProgramCache]: Analyzing trace with hash 2068019993, now seen corresponding path program 18 times [2021-11-13 02:38:48,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:48,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917757263] [2021-11-13 02:38:48,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:48,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:49,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 50344 proven. 69909 refuted. 0 times theorem prover too weak. 171523 trivial. 0 not checked. [2021-11-13 02:38:51,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:51,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917757263] [2021-11-13 02:38:51,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917757263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:51,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726460185] [2021-11-13 02:38:51,497 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:38:51,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:51,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:51,498 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:51,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 02:38:52,941 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:38:52,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:52,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 5223 conjuncts, 573 conjunts are in the unsatisfiable core [2021-11-13 02:38:52,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:58,971 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 49486 proven. 53497 refuted. 0 times theorem prover too weak. 188793 trivial. 0 not checked. [2021-11-13 02:38:58,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:31,606 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 53101 proven. 51887 refuted. 0 times theorem prover too weak. 186788 trivial. 0 not checked. [2021-11-13 02:41:31,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726460185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:31,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1856264013] [2021-11-13 02:41:31,608 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:41:31,608 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:31,609 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:41:31,609 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:31,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 53] total 73 [2021-11-13 02:41:31,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69634686] [2021-11-13 02:41:31,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:31,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-13 02:41:31,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:31,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-13 02:41:31,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=4249, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 02:41:31,616 INFO L87 Difference]: Start difference. First operand 208 states and 279 transitions. Second operand has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-13 02:41:31,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:31,880 INFO L93 Difference]: Finished difference Result 239 states and 339 transitions. [2021-11-13 02:41:31,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 02:41:31,881 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) Word has length 2810 [2021-11-13 02:41:31,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:31,885 INFO L225 Difference]: With dead ends: 239 [2021-11-13 02:41:31,885 INFO L226 Difference]: Without dead ends: 238 [2021-11-13 02:41:31,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6195 GetRequests, 6119 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1274, Invalid=4732, Unknown=0, NotChecked=0, Total=6006 [2021-11-13 02:41:31,886 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 77 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 116.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.48ms SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 162.23ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:31,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 227 Invalid, 290 Unknown, 0 Unchecked, 1.48ms Time], IncrementalHoareTripleChecker [44 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 162.23ms Time] [2021-11-13 02:41:31,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-13 02:41:31,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 228. [2021-11-13 02:41:31,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 183 states have (on average 1.0163934426229508) internal successors, (186), 181 states have internal predecessors, (186), 30 states have call successors, (30), 20 states have call predecessors, (30), 14 states have return successors, (109), 26 states have call predecessors, (109), 29 states have call successors, (109) [2021-11-13 02:41:31,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 325 transitions. [2021-11-13 02:41:31,904 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 325 transitions. Word has length 2810 [2021-11-13 02:41:31,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:31,906 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 325 transitions. [2021-11-13 02:41:31,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-13 02:41:31,907 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 325 transitions. [2021-11-13 02:41:32,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5642 [2021-11-13 02:41:32,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:32,096 INFO L514 BasicCegarLoop]: trace histogram [576, 574, 466, 288, 288, 288, 288, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-13 02:41:32,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 02:41:32,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-13 02:41:32,296 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:41:32,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:32,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1218820887, now seen corresponding path program 19 times [2021-11-13 02:41:32,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:32,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752080121] [2021-11-13 02:41:32,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:32,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:33,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:36,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 29084 proven. 67761 refuted. 0 times theorem prover too weak. 1082587 trivial. 0 not checked. [2021-11-13 02:41:36,169 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:36,169 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752080121] [2021-11-13 02:41:36,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752080121] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:36,169 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880027817] [2021-11-13 02:41:36,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:41:36,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:36,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:36,170 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:36,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 02:41:39,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:39,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 10451 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-13 02:41:39,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:46,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71094 refuted. 0 times theorem prover too weak. 1075808 trivial. 0 not checked. [2021-11-13 02:41:46,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:42:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71574 refuted. 0 times theorem prover too weak. 1075328 trivial. 0 not checked. [2021-11-13 02:42:07,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880027817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:42:07,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953896313] [2021-11-13 02:42:07,700 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:42:07,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:42:07,701 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:42:07,702 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:42:07,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 47] total 52 [2021-11-13 02:42:07,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361906871] [2021-11-13 02:42:07,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:42:07,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-13 02:42:07,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:42:07,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-13 02:42:07,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=2248, Unknown=0, NotChecked=0, Total=2652 [2021-11-13 02:42:07,713 INFO L87 Difference]: Start difference. First operand 228 states and 325 transitions. Second operand has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-13 02:42:10,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:42:10,011 INFO L93 Difference]: Finished difference Result 526 states and 840 transitions. [2021-11-13 02:42:10,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-13 02:42:10,015 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) Word has length 5641 [2021-11-13 02:42:10,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:42:10,023 INFO L225 Difference]: With dead ends: 526 [2021-11-13 02:42:10,023 INFO L226 Difference]: Without dead ends: 303 [2021-11-13 02:42:10,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11379 GetRequests, 11276 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2433 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2404, Invalid=8102, Unknown=0, NotChecked=0, Total=10506 [2021-11-13 02:42:10,032 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 2076 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 1352 mSolverCounterSat, 2538 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1134.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2076 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 3890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.36ms SdHoareTripleChecker+Time, 2538 IncrementalHoareTripleChecker+Valid, 1352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1401.65ms IncrementalHoareTripleChecker+Time [2021-11-13 02:42:10,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2076 Valid, 353 Invalid, 3890 Unknown, 0 Unchecked, 8.36ms Time], IncrementalHoareTripleChecker [2538 Valid, 1352 Invalid, 0 Unknown, 0 Unchecked, 1401.65ms Time] [2021-11-13 02:42:10,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-13 02:42:10,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 290. [2021-11-13 02:42:10,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 231 states have internal predecessors, (240), 39 states have call successors, (39), 29 states have call predecessors, (39), 15 states have return successors, (130), 29 states have call predecessors, (130), 38 states have call successors, (130) [2021-11-13 02:42:10,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 409 transitions. [2021-11-13 02:42:10,061 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 409 transitions. Word has length 5641 [2021-11-13 02:42:10,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:42:10,064 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 409 transitions. [2021-11-13 02:42:10,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-13 02:42:10,065 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 409 transitions. [2021-11-13 02:42:10,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5636 [2021-11-13 02:42:10,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:42:10,255 INFO L514 BasicCegarLoop]: trace histogram [575, 574, 465, 287, 287, 287, 287, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-13 02:42:10,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 02:42:10,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-13 02:42:10,455 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:42:10,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:42:10,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1300885345, now seen corresponding path program 20 times [2021-11-13 02:42:10,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:42:10,457 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144681144] [2021-11-13 02:42:10,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:42:10,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:42:12,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:42:14,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1176956 backedges. 27926 proven. 67065 refuted. 0 times theorem prover too weak. 1081965 trivial. 0 not checked. [2021-11-13 02:42:14,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:42:14,149 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144681144] [2021-11-13 02:42:14,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144681144] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:42:14,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003400954] [2021-11-13 02:42:14,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:42:14,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:14,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:42:14,152 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:42:14,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 02:42:17,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 135 check-sat command(s) [2021-11-13 02:42:17,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:42:17,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 3429 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 02:42:17,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:42:25,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1176956 backedges. 31502 proven. 52534 refuted. 0 times theorem prover too weak. 1092920 trivial. 0 not checked. [2021-11-13 02:42:25,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:42:44,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1176956 backedges. 31502 proven. 52915 refuted. 0 times theorem prover too weak. 1092539 trivial. 0 not checked. [2021-11-13 02:42:44,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003400954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:42:44,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032700816] [2021-11-13 02:42:44,350 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:42:44,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:42:44,352 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:42:44,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:42:44,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 23, 39] total 50 [2021-11-13 02:42:44,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851113348] [2021-11-13 02:42:44,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:42:44,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-13 02:42:44,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:42:44,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-13 02:42:44,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=2044, Unknown=0, NotChecked=0, Total=2450 [2021-11-13 02:42:44,360 INFO L87 Difference]: Start difference. First operand 290 states and 409 transitions. Second operand has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) [2021-11-13 02:42:45,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:42:45,706 INFO L93 Difference]: Finished difference Result 615 states and 907 transitions. [2021-11-13 02:42:45,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 02:42:45,710 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) Word has length 5635 [2021-11-13 02:42:45,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:42:45,717 INFO L225 Difference]: With dead ends: 615 [2021-11-13 02:42:45,717 INFO L226 Difference]: Without dead ends: 330 [2021-11-13 02:42:45,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11345 GetRequests, 11258 SyntacticMatches, 6 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1572, Invalid=5234, Unknown=0, NotChecked=0, Total=6806 [2021-11-13 02:42:45,722 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 857 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 1735 mSolverCounterSat, 612 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 669.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 857 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 2347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.92ms SdHoareTripleChecker+Time, 612 IncrementalHoareTripleChecker+Valid, 1735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 821.27ms IncrementalHoareTripleChecker+Time [2021-11-13 02:42:45,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [857 Valid, 508 Invalid, 2347 Unknown, 0 Unchecked, 5.92ms Time], IncrementalHoareTripleChecker [612 Valid, 1735 Invalid, 0 Unknown, 0 Unchecked, 821.27ms Time] [2021-11-13 02:42:45,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-13 02:42:45,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 237. [2021-11-13 02:42:45,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 189 states have internal predecessors, (194), 32 states have call successors, (32), 23 states have call predecessors, (32), 13 states have return successors, (97), 24 states have call predecessors, (97), 31 states have call successors, (97) [2021-11-13 02:42:45,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 323 transitions. [2021-11-13 02:42:45,746 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 323 transitions. Word has length 5635 [2021-11-13 02:42:45,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:42:45,750 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 323 transitions. [2021-11-13 02:42:45,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) [2021-11-13 02:42:45,750 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 323 transitions. [2021-11-13 02:42:46,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13742 [2021-11-13 02:42:46,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:42:46,972 INFO L514 BasicCegarLoop]: trace histogram [1405, 1395, 1138, 706, 706, 706, 706, 698, 698, 698, 698, 698, 697, 697, 696, 696, 432, 267, 1, 1, 1, 1] [2021-11-13 02:42:47,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 02:42:47,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:47,173 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:42:47,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:42:47,176 INFO L85 PathProgramCache]: Analyzing trace with hash -500659774, now seen corresponding path program 21 times [2021-11-13 02:42:47,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:42:47,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641927932] [2021-11-13 02:42:47,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:42:47,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:42:52,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:43:03,130 INFO L134 CoverageAnalysis]: Checked inductivity of 7010782 backedges. 37224 proven. 175274 refuted. 0 times theorem prover too weak. 6798284 trivial. 0 not checked. [2021-11-13 02:43:03,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:43:03,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641927932] [2021-11-13 02:43:03,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641927932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:43:03,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871839511] [2021-11-13 02:43:03,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:43:03,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:43:03,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:43:03,132 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:43:03,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-13 02:43:07,466 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:43:07,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:43:07,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 16991 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-13 02:43:07,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:43:25,485 INFO L134 CoverageAnalysis]: Checked inductivity of 7010782 backedges. 3152748 proven. 114510 refuted. 0 times theorem prover too weak. 3743524 trivial. 0 not checked. [2021-11-13 02:43:25,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:44:05,069 INFO L134 CoverageAnalysis]: Checked inductivity of 7010782 backedges. 43232 proven. 193733 refuted. 0 times theorem prover too weak. 6773817 trivial. 0 not checked. [2021-11-13 02:44:05,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871839511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:44:05,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056767208] [2021-11-13 02:44:05,074 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:44:05,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:44:05,075 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 02:44:05,075 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:44:05,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 42] total 47 [2021-11-13 02:44:05,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578262006] [2021-11-13 02:44:05,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:44:05,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-13 02:44:05,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:44:05,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-13 02:44:05,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1843, Unknown=0, NotChecked=0, Total=2162 [2021-11-13 02:44:05,094 INFO L87 Difference]: Start difference. First operand 237 states and 323 transitions. Second operand has 47 states, 47 states have (on average 5.829787234042553) internal successors, (274), 47 states have internal predecessors, (274), 42 states have call successors, (49), 11 states have call predecessors, (49), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2021-11-13 02:44:06,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:44:06,361 INFO L93 Difference]: Finished difference Result 545 states and 825 transitions. [2021-11-13 02:44:06,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-13 02:44:06,362 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 5.829787234042553) internal successors, (274), 47 states have internal predecessors, (274), 42 states have call successors, (49), 11 states have call predecessors, (49), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) Word has length 13741 [2021-11-13 02:44:06,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:44:06,371 INFO L225 Difference]: With dead ends: 545 [2021-11-13 02:44:06,371 INFO L226 Difference]: Without dead ends: 313 [2021-11-13 02:44:06,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27579 GetRequests, 27484 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2150 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2423, Invalid=6507, Unknown=0, NotChecked=0, Total=8930 [2021-11-13 02:44:06,376 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 792 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 398 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 291.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 792 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.98ms SdHoareTripleChecker+Time, 398 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 355.17ms IncrementalHoareTripleChecker+Time [2021-11-13 02:44:06,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [792 Valid, 177 Invalid, 878 Unknown, 0 Unchecked, 2.98ms Time], IncrementalHoareTripleChecker [398 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 355.17ms Time] [2021-11-13 02:44:06,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-11-13 02:44:06,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 250. [2021-11-13 02:44:06,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 201 states have (on average 1.0149253731343284) internal successors, (204), 200 states have internal predecessors, (204), 34 states have call successors, (34), 24 states have call predecessors, (34), 14 states have return successors, (110), 25 states have call predecessors, (110), 33 states have call successors, (110) [2021-11-13 02:44:06,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 348 transitions. [2021-11-13 02:44:06,398 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 348 transitions. Word has length 13741 [2021-11-13 02:44:06,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:44:06,402 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 348 transitions. [2021-11-13 02:44:06,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 5.829787234042553) internal successors, (274), 47 states have internal predecessors, (274), 42 states have call successors, (49), 11 states have call predecessors, (49), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2021-11-13 02:44:06,403 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 348 transitions. [2021-11-13 02:44:06,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7382 [2021-11-13 02:44:06,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:44:06,744 INFO L514 BasicCegarLoop]: trace histogram [753, 752, 609, 376, 376, 376, 376, 376, 376, 376, 376, 376, 376, 376, 375, 375, 233, 144, 1, 1, 1, 1] [2021-11-13 02:44:06,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-13 02:44:06,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:44:06,945 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-13 02:44:06,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:44:06,947 INFO L85 PathProgramCache]: Analyzing trace with hash 459728632, now seen corresponding path program 22 times [2021-11-13 02:44:06,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:44:06,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402039269] [2021-11-13 02:44:06,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:44:06,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:44:10,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:44:17,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2020769 backedges. 357292 proven. 476645 refuted. 0 times theorem prover too weak. 1186832 trivial. 0 not checked. [2021-11-13 02:44:17,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:44:17,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402039269] [2021-11-13 02:44:17,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402039269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:44:17,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753255237] [2021-11-13 02:44:17,616 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:44:17,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:44:17,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:44:17,617 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:44:17,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7a76f9f-c0a4-413b-bf69-8cb75f200dae/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-13 02:44:21,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:44:21,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 13666 conjuncts, 1505 conjunts are in the unsatisfiable core [2021-11-13 02:44:21,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:44:37,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2020769 backedges. 351088 proven. 364481 refuted. 0 times theorem prover too weak. 1305200 trivial. 0 not checked. [2021-11-13 02:44:37,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:45:52,522 WARN L227 SmtUtils]: Spent 12.08s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-13 02:46:04,827 WARN L227 SmtUtils]: Spent 12.16s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-13 02:46:16,962 WARN L227 SmtUtils]: Spent 12.10s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)