./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci05.c --full-output --architecture 32bit -------------------------------------------------------------------------------- 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_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/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_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/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 32bit --witnessprinter.graph.data.programhash 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:52:49,743 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:52:49,746 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:52:49,823 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:52:49,823 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:52:49,829 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:52:49,832 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:52:49,837 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:52:49,840 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:52:49,846 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:52:49,847 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:52:49,849 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:52:49,849 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:52:49,852 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:52:49,855 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:52:49,857 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:52:49,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:52:49,860 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:52:49,865 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:52:49,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:52:49,876 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:52:49,878 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:52:49,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:52:49,882 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:52:49,892 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:52:49,893 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:52:49,893 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:52:49,895 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:52:49,896 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:52:49,897 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:52:49,898 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:52:49,899 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:52:49,901 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:52:49,902 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:52:49,904 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:52:49,904 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:52:49,905 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:52:49,905 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:52:49,905 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:52:49,906 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:52:49,907 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:52:49,908 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-12 22:52:49,950 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:52:49,950 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:52:49,951 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:52:49,952 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:52:49,952 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:52:49,952 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:52:49,952 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:52:49,953 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:52:49,953 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:52:49,953 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:52:49,960 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:52:49,961 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:52:49,961 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:52:49,961 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:52:49,961 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:52:49,962 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:52:49,963 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:52:49,963 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:52:49,963 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-12 22:52:49,963 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:52:49,963 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:52:49,964 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:52:49,964 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:52:49,964 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:52:49,964 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:52:49,965 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-12 22:52:49,965 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:52:49,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:52:49,965 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:52:49,966 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:52:49,966 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:52:49,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:52:49,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:52:49,967 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:52:49,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:52:49,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:52:49,968 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:52:49,968 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:52:49,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:52:49,969 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:52:49,969 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:52:49,969 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_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd [2021-11-12 22:52:50,223 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:52:50,256 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:52:50,260 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:52:50,261 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:52:50,262 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:52:50,264 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:52:50,347 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/data/bfc2336a6/f9a47b7f55b241c1b02ecc75726320a4/FLAG3a9c0b6fc [2021-11-12 22:52:50,867 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:52:50,867 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:52:50,880 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/data/bfc2336a6/f9a47b7f55b241c1b02ecc75726320a4/FLAG3a9c0b6fc [2021-11-12 22:52:51,234 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/data/bfc2336a6/f9a47b7f55b241c1b02ecc75726320a4 [2021-11-12 22:52:51,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:52:51,242 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:52:51,247 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:52:51,248 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:52:51,251 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:52:51,252 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,255 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44218c8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51, skipping insertion in model container [2021-11-12 22:52:51,256 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,264 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:52:51,282 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:52:51,488 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_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:52:51,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:52:51,520 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:52:51,549 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_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:52:51,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:52:51,566 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:52:51,567 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51 WrapperNode [2021-11-12 22:52:51,567 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:52:51,568 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:52:51,569 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:52:51,569 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:52:51,577 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,589 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,609 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:52:51,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:52:51,610 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:52:51,610 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:52:51,619 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,619 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,621 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,621 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,625 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,627 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,630 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:52:51,647 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:52:51,647 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:52:51,647 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:52:51,648 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (1/1) ... [2021-11-12 22:52:51,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:52:51,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:51,681 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:52:51,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:52:51,724 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-12 22:52:51,724 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-12 22:52:51,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:52:51,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:52:51,725 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:52:51,725 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:52:52,049 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:52:52,067 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 22:52:52,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:52:52 BoogieIcfgContainer [2021-11-12 22:52:52,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:52:52,072 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:52:52,072 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:52:52,076 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:52:52,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:52:51" (1/3) ... [2021-11-12 22:52:52,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e311947 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:52:52, skipping insertion in model container [2021-11-12 22:52:52,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:51" (2/3) ... [2021-11-12 22:52:52,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e311947 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:52:52, skipping insertion in model container [2021-11-12 22:52:52,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:52:52" (3/3) ... [2021-11-12 22:52:52,079 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci05.c [2021-11-12 22:52:52,085 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:52:52,085 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-12 22:52:52,136 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:52:52,143 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 [2021-11-12 22:52:52,143 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-12 22:52:52,179 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 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) [2021-11-12 22:52:52,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-12 22:52:52,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:52,185 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-12 22:52:52,186 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:52,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:52,195 INFO L85 PathProgramCache]: Analyzing trace with hash -1991701821, now seen corresponding path program 1 times [2021-11-12 22:52:52,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:52,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558060272] [2021-11-12 22:52:52,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:52,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:52,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:52,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:52:52,492 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:52,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558060272] [2021-11-12 22:52:52,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558060272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:52,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:52,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 22:52:52,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373532588] [2021-11-12 22:52:52,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:52,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:52:52,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:52,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:52:52,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:52:52,544 INFO L87 Difference]: Start difference. First operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 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, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-12 22:52:52,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:52,693 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-11-12 22:52:52,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:52:52,696 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 6 [2021-11-12 22:52:52,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:52,704 INFO L225 Difference]: With dead ends: 25 [2021-11-12 22:52:52,704 INFO L226 Difference]: Without dead ends: 21 [2021-11-12 22:52:52,713 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 [2021-11-12 22:52:52,719 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.86ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.39ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 77.25ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:52,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 19 Invalid, 46 Unknown, 0 Unchecked, 7.39ms Time], IncrementalHoareTripleChecker [7 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 77.25ms Time] [2021-11-12 22:52:52,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-12 22:52:52,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-12 22:52:52,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 17 states have internal predecessors, (19), 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) [2021-11-12 22:52:52,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-12 22:52:52,777 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 6 [2021-11-12 22:52:52,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:52,777 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-12 22:52:52,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-12 22:52:52,778 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-12 22:52:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-12 22:52:52,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:52,784 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:52,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:52:52,786 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:52,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:52,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1613214265, now seen corresponding path program 1 times [2021-11-12 22:52:52,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:52,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436710090] [2021-11-12 22:52:52,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:52,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:52,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:52:52,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:52,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436710090] [2021-11-12 22:52:52,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436710090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:52,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:52,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 22:52:52,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853765799] [2021-11-12 22:52:52,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:52,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:52:52,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:52,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:52:52,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:52:52,859 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 2 states have (on average 3.0) 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) [2021-11-12 22:52:52,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:52,893 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-12 22:52:52,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:52:52,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) 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 [2021-11-12 22:52:52,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:52,896 INFO L225 Difference]: With dead ends: 23 [2021-11-12 22:52:52,896 INFO L226 Difference]: Without dead ends: 21 [2021-11-12 22:52:52,897 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 [2021-11-12 22:52:52,899 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.44ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.33ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:52,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 22 Invalid, 11 Unknown, 0 Unchecked, 1.44ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 26.33ms Time] [2021-11-12 22:52:52,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-12 22:52:52,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-11-12 22:52:52,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 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) [2021-11-12 22:52:52,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-12 22:52:52,908 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2021-11-12 22:52:52,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:52,909 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-12 22:52:52,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) 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) [2021-11-12 22:52:52,909 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-12 22:52:52,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-12 22:52:52,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:52,911 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:52,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 22:52:52,912 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:52,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:52,912 INFO L85 PathProgramCache]: Analyzing trace with hash -796740598, now seen corresponding path program 1 times [2021-11-12 22:52:52,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:52,913 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398610742] [2021-11-12 22:52:52,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:52,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:52,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:53,013 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:52:53,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:53,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398610742] [2021-11-12 22:52:53,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398610742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:53,014 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:53,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:52:53,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535466366] [2021-11-12 22:52:53,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:53,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:52:53,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:53,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:52:53,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:52:53,017 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2021-11-12 22:52:53,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:53,059 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-11-12 22:52:53,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:52:53,060 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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 28 [2021-11-12 22:52:53,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:53,062 INFO L225 Difference]: With dead ends: 35 [2021-11-12 22:52:53,062 INFO L226 Difference]: Without dead ends: 33 [2021-11-12 22:52:53,062 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 [2021-11-12 22:52:53,064 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.05ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.25ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.37ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:53,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 48 Invalid, 30 Unknown, 0 Unchecked, 1.25ms Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 31.37ms Time] [2021-11-12 22:52:53,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-12 22:52:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2021-11-12 22:52:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 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) [2021-11-12 22:52:53,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-11-12 22:52:53,085 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 28 [2021-11-12 22:52:53,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:53,085 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-11-12 22:52:53,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2021-11-12 22:52:53,086 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-11-12 22:52:53,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-12 22:52:53,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:53,088 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:53,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-12 22:52:53,089 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:53,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:53,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1082308036, now seen corresponding path program 1 times [2021-11-12 22:52:53,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:53,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993632386] [2021-11-12 22:52:53,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:53,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:53,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:53,172 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:52:53,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:53,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993632386] [2021-11-12 22:52:53,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993632386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:53,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265317716] [2021-11-12 22:52:53,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:53,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:53,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:53,177 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:53,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:52:53,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:53,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:52:53,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:53,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:53,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265317716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:53,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645012245] [2021-11-12 22:52:53,836 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-12 22:52:53,836 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:53,842 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) [2021-11-12 22:52:53,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:52:53,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-12 22:52:53,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054184058] [2021-11-12 22:52:53,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:53,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-12 22:52:53,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:53,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-12 22:52:53,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:52:53,870 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-11-12 22:52:54,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:54,250 INFO L93 Difference]: Finished difference Result 89 states and 127 transitions. [2021-11-12 22:52:54,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:52:54,251 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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 29 [2021-11-12 22:52:54,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:54,253 INFO L225 Difference]: With dead ends: 89 [2021-11-12 22:52:54,254 INFO L226 Difference]: Without dead ends: 63 [2021-11-12 22:52:54,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:52:54,258 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 171 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 147.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.31ms SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 186.23ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:54,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 55 Invalid, 226 Unknown, 0 Unchecked, 4.31ms Time], IncrementalHoareTripleChecker [65 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 186.23ms Time] [2021-11-12 22:52:54,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-12 22:52:54,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2021-11-12 22:52:54,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 40 states have internal predecessors, (41), 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) [2021-11-12 22:52:54,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2021-11-12 22:52:54,276 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 29 [2021-11-12 22:52:54,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:54,283 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2021-11-12 22:52:54,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-11-12 22:52:54,284 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2021-11-12 22:52:54,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-12 22:52:54,286 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:54,286 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:54,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:54,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:54,487 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:54,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:54,488 INFO L85 PathProgramCache]: Analyzing trace with hash -924275326, now seen corresponding path program 2 times [2021-11-12 22:52:54,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:54,488 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297599149] [2021-11-12 22:52:54,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:54,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:54,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:54,576 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:52:54,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:54,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297599149] [2021-11-12 22:52:54,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297599149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:54,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302924592] [2021-11-12 22:52:54,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:52:54,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:54,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:54,591 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:54,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:52:54,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-12 22:52:54,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:54,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:52:54,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:52:54,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:54,927 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:52:54,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302924592] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:54,928 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:52:54,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-12 22:52:54,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692933219] [2021-11-12 22:52:54,929 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:54,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:52:54,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:54,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:52:54,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:52:54,931 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-12 22:52:54,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:54,989 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2021-11-12 22:52:54,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:52:54,990 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 29 [2021-11-12 22:52:54,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:54,992 INFO L225 Difference]: With dead ends: 59 [2021-11-12 22:52:54,993 INFO L226 Difference]: Without dead ends: 58 [2021-11-12 22:52:54,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:52:54,995 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.99ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.23ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:54,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 53 Invalid, 28 Unknown, 0 Unchecked, 0.99ms Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 40.23ms Time] [2021-11-12 22:52:54,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-12 22:52:55,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2021-11-12 22:52:55,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 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) [2021-11-12 22:52:55,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2021-11-12 22:52:55,026 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 29 [2021-11-12 22:52:55,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:55,026 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2021-11-12 22:52:55,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-12 22:52:55,027 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2021-11-12 22:52:55,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-12 22:52:55,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:55,029 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] [2021-11-12 22:52:55,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:55,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:55,243 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:55,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:55,244 INFO L85 PathProgramCache]: Analyzing trace with hash -619328111, now seen corresponding path program 1 times [2021-11-12 22:52:55,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:55,245 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942829814] [2021-11-12 22:52:55,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:55,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:55,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:55,349 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:52:55,349 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:55,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942829814] [2021-11-12 22:52:55,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942829814] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:55,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100586762] [2021-11-12 22:52:55,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:55,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:55,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:55,352 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:55,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:52:55,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:55,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:52:55,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:55,520 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:52:55,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:55,648 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:52:55,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100586762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:55,652 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [93282136] [2021-11-12 22:52:55,657 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:52:55,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:55,659 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) [2021-11-12 22:52:55,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:52:55,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-12 22:52:55,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210042748] [2021-11-12 22:52:55,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:55,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:52:55,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:55,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:52:55,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:52:55,680 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-11-12 22:52:55,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:55,796 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2021-11-12 22:52:55,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:52:55,798 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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 24 [2021-11-12 22:52:55,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:55,801 INFO L225 Difference]: With dead ends: 68 [2021-11-12 22:52:55,801 INFO L226 Difference]: Without dead ends: 67 [2021-11-12 22:52:55,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:52:55,803 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 16 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.96ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:55,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 123 Invalid, 76 Unknown, 0 Unchecked, 2.96ms Time], IncrementalHoareTripleChecker [9 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 70.74ms Time] [2021-11-12 22:52:55,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-12 22:52:55,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2021-11-12 22:52:55,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 50 states have internal predecessors, (54), 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) [2021-11-12 22:52:55,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2021-11-12 22:52:55,833 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 24 [2021-11-12 22:52:55,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:55,834 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2021-11-12 22:52:55,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-11-12 22:52:55,835 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2021-11-12 22:52:55,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-12 22:52:55,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:55,838 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] [2021-11-12 22:52:55,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:56,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 22:52:56,051 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:56,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:56,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1640577773, now seen corresponding path program 1 times [2021-11-12 22:52:56,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:56,052 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479368861] [2021-11-12 22:52:56,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:56,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:56,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:56,169 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-12 22:52:56,169 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:56,169 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479368861] [2021-11-12 22:52:56,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479368861] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:56,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612534864] [2021-11-12 22:52:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:56,171 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:56,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:56,179 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:56,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:52:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:56,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:52:56,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:56,401 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-12 22:52:56,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:56,658 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-12 22:52:56,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612534864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:56,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [673815030] [2021-11-12 22:52:56,661 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:52:56,661 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:56,662 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) [2021-11-12 22:52:56,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:52:56,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-12 22:52:56,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72068047] [2021-11-12 22:52:56,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:56,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-12 22:52:56,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:56,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-12 22:52:56,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:52:56,666 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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) [2021-11-12 22:52:56,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:56,908 INFO L93 Difference]: Finished difference Result 133 states and 198 transitions. [2021-11-12 22:52:56,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 22:52:56,915 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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 49 [2021-11-12 22:52:56,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:56,927 INFO L225 Difference]: With dead ends: 133 [2021-11-12 22:52:56,933 INFO L226 Difference]: Without dead ends: 132 [2021-11-12 22:52:56,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:52:56,939 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 43 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 109.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.56ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 142.29ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:56,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 183 Invalid, 173 Unknown, 0 Unchecked, 3.56ms Time], IncrementalHoareTripleChecker [16 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 142.29ms Time] [2021-11-12 22:52:56,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-12 22:52:56,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-11-12 22:52:56,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-12 22:52:56,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-12 22:52:56,989 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 49 [2021-11-12 22:52:56,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:56,990 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-12 22:52:56,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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) [2021-11-12 22:52:56,990 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-12 22:52:56,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-12 22:52:57,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:57,006 INFO L514 BasicCegarLoop]: trace histogram [12, 9, 8, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 1, 1, 1] [2021-11-12 22:52:57,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:57,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-12 22:52:57,223 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:57,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:57,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1641222587, now seen corresponding path program 1 times [2021-11-12 22:52:57,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:57,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588445775] [2021-11-12 22:52:57,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:57,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 298 trivial. 0 not checked. [2021-11-12 22:52:57,349 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:57,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588445775] [2021-11-12 22:52:57,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588445775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:57,350 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:57,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:52:57,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629365154] [2021-11-12 22:52:57,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:57,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:52:57,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:57,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:52:57,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:52:57,352 INFO L87 Difference]: Start difference. First operand 97 states and 158 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) [2021-11-12 22:52:57,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:57,391 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-11-12 22:52:57,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:52:57,392 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 102 [2021-11-12 22:52:57,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:57,400 INFO L225 Difference]: With dead ends: 110 [2021-11-12 22:52:57,400 INFO L226 Difference]: Without dead ends: 109 [2021-11-12 22:52:57,401 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 [2021-11-12 22:52:57,402 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.75ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.37ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:57,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 52 Invalid, 33 Unknown, 0 Unchecked, 0.75ms Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 23.37ms Time] [2021-11-12 22:52:57,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-12 22:52:57,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2021-11-12 22:52:57,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-12 22:52:57,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-12 22:52:57,456 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 102 [2021-11-12 22:52:57,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:57,457 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-12 22:52:57,457 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) [2021-11-12 22:52:57,457 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-12 22:52:57,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-12 22:52:57,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:57,460 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1] [2021-11-12 22:52:57,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 22:52:57,461 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:57,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:57,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1579393548, now seen corresponding path program 2 times [2021-11-12 22:52:57,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:57,462 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142960257] [2021-11-12 22:52:57,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:57,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:57,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:57,537 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-12 22:52:57,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:57,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142960257] [2021-11-12 22:52:57,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142960257] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:57,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:57,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:52:57,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443634993] [2021-11-12 22:52:57,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:57,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:52:57,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:57,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:52:57,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:52:57,541 INFO L87 Difference]: Start difference. First operand 97 states and 158 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) [2021-11-12 22:52:57,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:57,569 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-11-12 22:52:57,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:52:57,570 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 [2021-11-12 22:52:57,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:57,572 INFO L225 Difference]: With dead ends: 110 [2021-11-12 22:52:57,572 INFO L226 Difference]: Without dead ends: 109 [2021-11-12 22:52:57,573 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 [2021-11-12 22:52:57,574 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.57ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.91ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:57,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 42 Invalid, 25 Unknown, 0 Unchecked, 0.57ms Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 18.91ms Time] [2021-11-12 22:52:57,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-12 22:52:57,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2021-11-12 22:52:57,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-12 22:52:57,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-12 22:52:57,593 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 69 [2021-11-12 22:52:57,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:57,594 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-12 22:52:57,594 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) [2021-11-12 22:52:57,594 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-12 22:52:57,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-12 22:52:57,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:57,597 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] [2021-11-12 22:52:57,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:52:57,598 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:57,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:57,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1714226486, now seen corresponding path program 2 times [2021-11-12 22:52:57,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:57,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113494626] [2021-11-12 22:52:57,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:57,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:57,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:57,772 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 59 proven. 238 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2021-11-12 22:52:57,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:57,772 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113494626] [2021-11-12 22:52:57,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113494626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:57,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207025394] [2021-11-12 22:52:57,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:52:57,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:57,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:57,774 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:57,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:52:57,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:52:57,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:57,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:52:57,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:58,186 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 303 proven. 85 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-11-12 22:52:58,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:59,006 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 303 proven. 88 refuted. 0 times theorem prover too weak. 493 trivial. 0 not checked. [2021-11-12 22:52:59,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207025394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:59,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1559503608] [2021-11-12 22:52:59,010 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:52:59,010 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:59,011 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) [2021-11-12 22:52:59,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:52:59,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-11-12 22:52:59,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820210244] [2021-11-12 22:52:59,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:59,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-12 22:52:59,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:59,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-12 22:52:59,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:52:59,015 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 17 states, 17 states have (on average 5.176470588235294) internal successors, (88), 17 states have internal predecessors, (88), 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) [2021-11-12 22:52:59,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:59,436 INFO L93 Difference]: Finished difference Result 244 states and 451 transitions. [2021-11-12 22:52:59,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-12 22:52:59,437 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.176470588235294) internal successors, (88), 17 states have internal predecessors, (88), 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 161 [2021-11-12 22:52:59,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:59,440 INFO L225 Difference]: With dead ends: 244 [2021-11-12 22:52:59,440 INFO L226 Difference]: Without dead ends: 149 [2021-11-12 22:52:59,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=224, Invalid=588, Unknown=0, NotChecked=0, Total=812 [2021-11-12 22:52:59,445 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 229 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 190.79ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.12ms SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 233.09ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:59,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 91 Invalid, 355 Unknown, 0 Unchecked, 4.12ms Time], IncrementalHoareTripleChecker [111 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 233.09ms Time] [2021-11-12 22:52:59,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-12 22:52:59,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 134. [2021-11-12 22:52:59,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 102 states have internal predecessors, (114), 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) [2021-11-12 22:52:59,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 206 transitions. [2021-11-12 22:52:59,481 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 206 transitions. Word has length 161 [2021-11-12 22:52:59,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:59,481 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 206 transitions. [2021-11-12 22:52:59,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.176470588235294) internal successors, (88), 17 states have internal predecessors, (88), 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) [2021-11-12 22:52:59,482 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 206 transitions. [2021-11-12 22:52:59,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-12 22:52:59,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:59,486 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1] [2021-11-12 22:52:59,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:59,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:59,707 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:52:59,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:59,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1025640740, now seen corresponding path program 3 times [2021-11-12 22:52:59,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:59,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811902310] [2021-11-12 22:52:59,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:59,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:59,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:59,765 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 69 proven. 3 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2021-11-12 22:52:59,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:59,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811902310] [2021-11-12 22:52:59,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811902310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:59,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985733305] [2021-11-12 22:52:59,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:52:59,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:59,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:59,768 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:59,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:52:59,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:52:59,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:59,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:52:59,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:00,096 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 61 proven. 85 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-12 22:53:00,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 61 proven. 93 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-12 22:53:00,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985733305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:00,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1908979989] [2021-11-12 22:53:00,666 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:00,666 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:00,666 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) [2021-11-12 22:53:00,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:00,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 13] total 17 [2021-11-12 22:53:00,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436036347] [2021-11-12 22:53:00,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:00,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-12 22:53:00,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:00,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-12 22:53:00,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:53:00,670 INFO L87 Difference]: Start difference. First operand 134 states and 206 transitions. Second operand has 17 states, 17 states have (on average 5.0) internal successors, (85), 17 states have internal predecessors, (85), 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) [2021-11-12 22:53:00,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:00,861 INFO L93 Difference]: Finished difference Result 195 states and 303 transitions. [2021-11-12 22:53:00,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:53:00,862 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 17 states have internal predecessors, (85), 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 82 [2021-11-12 22:53:00,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:00,863 INFO L225 Difference]: With dead ends: 195 [2021-11-12 22:53:00,863 INFO L226 Difference]: Without dead ends: 63 [2021-11-12 22:53:00,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 152 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:53:00,866 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 84 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 81.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.61ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 100.34ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:00,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 64 Invalid, 169 Unknown, 0 Unchecked, 1.61ms Time], IncrementalHoareTripleChecker [36 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 100.34ms Time] [2021-11-12 22:53:00,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-12 22:53:00,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-12 22:53:00,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 49 states have (on average 1.0816326530612246) 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) [2021-11-12 22:53:00,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-12 22:53:00,873 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 82 [2021-11-12 22:53:00,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:00,873 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-12 22:53:00,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.0) internal successors, (85), 17 states have internal predecessors, (85), 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) [2021-11-12 22:53:00,874 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-12 22:53:00,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-12 22:53:00,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:00,875 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] [2021-11-12 22:53:00,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:01,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-12 22:53:01,091 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:01,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:01,092 INFO L85 PathProgramCache]: Analyzing trace with hash 389721563, now seen corresponding path program 4 times [2021-11-12 22:53:01,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:01,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259152526] [2021-11-12 22:53:01,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:01,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:01,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:01,225 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-12 22:53:01,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:01,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259152526] [2021-11-12 22:53:01,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259152526] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:01,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667528749] [2021-11-12 22:53:01,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:53:01,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:01,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:01,228 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:01,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 22:53:01,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:01,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:53:01,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:01,577 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 30 proven. 44 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-11-12 22:53:01,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:02,158 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 45 proven. 45 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-12 22:53:02,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667528749] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:02,159 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320230136] [2021-11-12 22:53:02,161 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:02,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:02,162 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) [2021-11-12 22:53:02,163 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:02,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13] total 25 [2021-11-12 22:53:02,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266920537] [2021-11-12 22:53:02,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:02,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-12 22:53:02,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:02,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-12 22:53:02,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2021-11-12 22:53:02,166 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 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) [2021-11-12 22:53:02,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:02,287 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2021-11-12 22:53:02,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:53:02,288 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 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 89 [2021-11-12 22:53:02,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:02,290 INFO L225 Difference]: With dead ends: 67 [2021-11-12 22:53:02,290 INFO L226 Difference]: Without dead ends: 66 [2021-11-12 22:53:02,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2021-11-12 22:53:02,292 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 31 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.75ms SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.37ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:02,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 145 Invalid, 131 Unknown, 0 Unchecked, 1.75ms Time], IncrementalHoareTripleChecker [18 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 70.37ms Time] [2021-11-12 22:53:02,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-12 22:53:02,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2021-11-12 22:53:02,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 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) [2021-11-12 22:53:02,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-11-12 22:53:02,300 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 89 [2021-11-12 22:53:02,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:02,301 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-11-12 22:53:02,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 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) [2021-11-12 22:53:02,302 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-11-12 22:53:02,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 22:53:02,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:02,304 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] [2021-11-12 22:53:02,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:02,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:02,519 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:02,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:02,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1272021628, now seen corresponding path program 3 times [2021-11-12 22:53:02,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:02,520 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975566935] [2021-11-12 22:53:02,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:02,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:02,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:02,725 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-12 22:53:02,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:02,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975566935] [2021-11-12 22:53:02,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975566935] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:02,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107259989] [2021-11-12 22:53:02,726 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:53:02,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:02,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:02,728 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:02,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:53:02,826 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:53:02,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:02,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-12 22:53:02,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:03,209 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2021-11-12 22:53:03,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:04,463 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-11-12 22:53:04,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107259989] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:04,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [12930327] [2021-11-12 22:53:04,475 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:04,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:04,475 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) [2021-11-12 22:53:04,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:04,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2021-11-12 22:53:04,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117423541] [2021-11-12 22:53:04,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:04,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 22:53:04,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:04,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 22:53:04,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:53:04,482 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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) [2021-11-12 22:53:04,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:04,789 INFO L93 Difference]: Finished difference Result 127 states and 175 transitions. [2021-11-12 22:53:04,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-12 22:53:04,790 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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 147 [2021-11-12 22:53:04,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:04,792 INFO L225 Difference]: With dead ends: 127 [2021-11-12 22:53:04,792 INFO L226 Difference]: Without dead ends: 126 [2021-11-12 22:53:04,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=385, Invalid=1255, Unknown=0, NotChecked=0, Total=1640 [2021-11-12 22:53:04,793 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 56 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 131.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.62ms SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 158.24ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:04,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 235 Invalid, 246 Unknown, 0 Unchecked, 3.62ms Time], IncrementalHoareTripleChecker [33 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 158.24ms Time] [2021-11-12 22:53:04,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-12 22:53:04,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2021-11-12 22:53:04,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 75 states have internal predecessors, (80), 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) [2021-11-12 22:53:04,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 138 transitions. [2021-11-12 22:53:04,805 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 138 transitions. Word has length 147 [2021-11-12 22:53:04,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:04,806 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 138 transitions. [2021-11-12 22:53:04,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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) [2021-11-12 22:53:04,806 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 138 transitions. [2021-11-12 22:53:04,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-12 22:53:04,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:04,812 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] [2021-11-12 22:53:04,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:05,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:05,039 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:05,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:05,040 INFO L85 PathProgramCache]: Analyzing trace with hash -966947876, now seen corresponding path program 4 times [2021-11-12 22:53:05,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:05,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628236392] [2021-11-12 22:53:05,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:05,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:05,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:05,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 405 proven. 1064 refuted. 0 times theorem prover too weak. 2714 trivial. 0 not checked. [2021-11-12 22:53:05,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:05,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628236392] [2021-11-12 22:53:05,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628236392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:05,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332924649] [2021-11-12 22:53:05,262 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:53:05,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:05,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:05,263 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:05,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 22:53:05,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:05,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:53:05,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:06,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 390 proven. 1469 refuted. 0 times theorem prover too weak. 2324 trivial. 0 not checked. [2021-11-12 22:53:06,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:07,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 390 proven. 1508 refuted. 0 times theorem prover too weak. 2285 trivial. 0 not checked. [2021-11-12 22:53:07,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332924649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:07,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [186717607] [2021-11-12 22:53:07,721 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:07,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:07,722 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) [2021-11-12 22:53:07,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:07,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2021-11-12 22:53:07,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645549880] [2021-11-12 22:53:07,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:07,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 22:53:07,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:07,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 22:53:07,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:53:07,726 INFO L87 Difference]: Start difference. First operand 98 states and 138 transitions. Second operand has 24 states, 24 states have (on average 5.458333333333333) internal successors, (131), 24 states have internal predecessors, (131), 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) [2021-11-12 22:53:08,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:08,171 INFO L93 Difference]: Finished difference Result 245 states and 391 transitions. [2021-11-12 22:53:08,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-12 22:53:08,172 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.458333333333333) internal successors, (131), 24 states have internal predecessors, (131), 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 343 [2021-11-12 22:53:08,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:08,174 INFO L225 Difference]: With dead ends: 245 [2021-11-12 22:53:08,174 INFO L226 Difference]: Without dead ends: 151 [2021-11-12 22:53:08,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 720 GetRequests, 680 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2021-11-12 22:53:08,178 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 239 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 156.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.90ms SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 185.84ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:08,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 88 Invalid, 360 Unknown, 0 Unchecked, 2.90ms Time], IncrementalHoareTripleChecker [118 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 185.84ms Time] [2021-11-12 22:53:08,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-12 22:53:08,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 136. [2021-11-12 22:53:08,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 104 states have internal predecessors, (113), 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) [2021-11-12 22:53:08,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 185 transitions. [2021-11-12 22:53:08,191 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 185 transitions. Word has length 343 [2021-11-12 22:53:08,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:08,192 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 185 transitions. [2021-11-12 22:53:08,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.458333333333333) internal successors, (131), 24 states have internal predecessors, (131), 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) [2021-11-12 22:53:08,192 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 185 transitions. [2021-11-12 22:53:08,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-12 22:53:08,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:08,197 INFO L514 BasicCegarLoop]: trace histogram [30, 28, 24, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 13, 13, 9, 6, 1, 1, 1] [2021-11-12 22:53:08,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:08,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-12 22:53:08,415 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:08,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:08,416 INFO L85 PathProgramCache]: Analyzing trace with hash -747865753, now seen corresponding path program 5 times [2021-11-12 22:53:08,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:08,416 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667554171] [2021-11-12 22:53:08,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:08,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:08,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:08,690 INFO L134 CoverageAnalysis]: Checked inductivity of 2841 backedges. 498 proven. 945 refuted. 0 times theorem prover too weak. 1398 trivial. 0 not checked. [2021-11-12 22:53:08,690 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:08,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667554171] [2021-11-12 22:53:08,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667554171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:08,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513157079] [2021-11-12 22:53:08,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:53:08,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:08,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:08,695 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:08,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 22:53:08,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-12 22:53:08,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:08,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:53:08,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:09,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2841 backedges. 863 proven. 95 refuted. 0 times theorem prover too weak. 1883 trivial. 0 not checked. [2021-11-12 22:53:09,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 2841 backedges. 863 proven. 103 refuted. 0 times theorem prover too weak. 1875 trivial. 0 not checked. [2021-11-12 22:53:10,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [513157079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:10,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098617564] [2021-11-12 22:53:10,425 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:10,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:10,425 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) [2021-11-12 22:53:10,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:10,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10, 13] total 24 [2021-11-12 22:53:10,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269389621] [2021-11-12 22:53:10,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:10,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 22:53:10,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:10,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 22:53:10,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:53:10,430 INFO L87 Difference]: Start difference. First operand 136 states and 185 transitions. Second operand has 24 states, 24 states have (on average 5.333333333333333) internal successors, (128), 24 states have internal predecessors, (128), 15 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 16 states have call predecessors, (30), 15 states have call successors, (30) [2021-11-12 22:53:11,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:11,012 INFO L93 Difference]: Finished difference Result 271 states and 415 transitions. [2021-11-12 22:53:11,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-12 22:53:11,013 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.333333333333333) internal successors, (128), 24 states have internal predecessors, (128), 15 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 16 states have call predecessors, (30), 15 states have call successors, (30) Word has length 284 [2021-11-12 22:53:11,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:11,015 INFO L225 Difference]: With dead ends: 271 [2021-11-12 22:53:11,015 INFO L226 Difference]: Without dead ends: 139 [2021-11-12 22:53:11,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 566 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=479, Invalid=1501, Unknown=0, NotChecked=0, Total=1980 [2021-11-12 22:53:11,019 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 262 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 189.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.31ms SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 246.91ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:11,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 87 Invalid, 424 Unknown, 0 Unchecked, 3.31ms Time], IncrementalHoareTripleChecker [130 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 246.91ms Time] [2021-11-12 22:53:11,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-12 22:53:11,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 121. [2021-11-12 22:53:11,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 93 states have internal predecessors, (103), 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) [2021-11-12 22:53:11,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 147 transitions. [2021-11-12 22:53:11,041 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 147 transitions. Word has length 284 [2021-11-12 22:53:11,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:11,042 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 147 transitions. [2021-11-12 22:53:11,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.333333333333333) internal successors, (128), 24 states have internal predecessors, (128), 15 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 16 states have call predecessors, (30), 15 states have call successors, (30) [2021-11-12 22:53:11,043 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 147 transitions. [2021-11-12 22:53:11,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-12 22:53:11,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:11,049 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] [2021-11-12 22:53:11,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:11,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-12 22:53:11,271 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:11,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:11,272 INFO L85 PathProgramCache]: Analyzing trace with hash -870810129, now seen corresponding path program 6 times [2021-11-12 22:53:11,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:11,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986688817] [2021-11-12 22:53:11,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:11,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:11,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:11,509 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 509 proven. 990 refuted. 0 times theorem prover too weak. 1637 trivial. 0 not checked. [2021-11-12 22:53:11,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:11,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986688817] [2021-11-12 22:53:11,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986688817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:11,510 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485560656] [2021-11-12 22:53:11,510 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:53:11,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:11,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:11,511 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:11,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:53:11,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:53:11,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:11,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:53:11,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:12,317 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1778 proven. 484 refuted. 0 times theorem prover too weak. 874 trivial. 0 not checked. [2021-11-12 22:53:12,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:14,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 504 proven. 1101 refuted. 0 times theorem prover too weak. 1531 trivial. 0 not checked. [2021-11-12 22:53:14,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485560656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:14,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932564437] [2021-11-12 22:53:14,265 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:14,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:14,266 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) [2021-11-12 22:53:14,267 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:14,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 19] total 24 [2021-11-12 22:53:14,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355378570] [2021-11-12 22:53:14,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:14,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 22:53:14,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:14,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 22:53:14,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:53:14,270 INFO L87 Difference]: Start difference. First operand 121 states and 147 transitions. Second operand has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 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) [2021-11-12 22:53:14,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:14,736 INFO L93 Difference]: Finished difference Result 233 states and 303 transitions. [2021-11-12 22:53:14,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-12 22:53:14,737 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 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 298 [2021-11-12 22:53:14,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:14,739 INFO L225 Difference]: With dead ends: 233 [2021-11-12 22:53:14,739 INFO L226 Difference]: Without dead ends: 116 [2021-11-12 22:53:14,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 590 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 22:53:14,742 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 167 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 237.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.41ms SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 285.86ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:14,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 143 Invalid, 552 Unknown, 0 Unchecked, 3.41ms Time], IncrementalHoareTripleChecker [111 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 285.86ms Time] [2021-11-12 22:53:14,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-12 22:53:14,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 104. [2021-11-12 22:53:14,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 83 states have (on average 1.036144578313253) internal successors, (86), 81 states have internal predecessors, (86), 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) [2021-11-12 22:53:14,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2021-11-12 22:53:14,754 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 298 [2021-11-12 22:53:14,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:14,755 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2021-11-12 22:53:14,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 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) [2021-11-12 22:53:14,756 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2021-11-12 22:53:14,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-12 22:53:14,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:14,764 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] [2021-11-12 22:53:14,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:14,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-12 22:53:14,979 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:14,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:14,980 INFO L85 PathProgramCache]: Analyzing trace with hash -1996421230, now seen corresponding path program 7 times [2021-11-12 22:53:14,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:14,980 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219823548] [2021-11-12 22:53:14,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:14,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:15,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:15,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 764 proven. 1095 refuted. 0 times theorem prover too weak. 2324 trivial. 0 not checked. [2021-11-12 22:53:15,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:15,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219823548] [2021-11-12 22:53:15,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219823548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:15,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752575583] [2021-11-12 22:53:15,278 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:53:15,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:15,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:15,280 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:15,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 22:53:15,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:15,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:53:15,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:16,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1214 refuted. 0 times theorem prover too weak. 2085 trivial. 0 not checked. [2021-11-12 22:53:16,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:18,434 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1290 refuted. 0 times theorem prover too weak. 2009 trivial. 0 not checked. [2021-11-12 22:53:18,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752575583] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:18,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084814137] [2021-11-12 22:53:18,436 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:18,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:18,437 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) [2021-11-12 22:53:18,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:18,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-12 22:53:18,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827670262] [2021-11-12 22:53:18,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:18,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-12 22:53:18,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:18,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-12 22:53:18,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-12 22:53:18,441 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 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) [2021-11-12 22:53:19,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:19,008 INFO L93 Difference]: Finished difference Result 222 states and 280 transitions. [2021-11-12 22:53:19,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-12 22:53:19,009 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 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 343 [2021-11-12 22:53:19,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:19,011 INFO L225 Difference]: With dead ends: 222 [2021-11-12 22:53:19,011 INFO L226 Difference]: Without dead ends: 122 [2021-11-12 22:53:19,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 678 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:53:19,013 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 341 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 291.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.53ms SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 360.28ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:19,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 207 Invalid, 877 Unknown, 0 Unchecked, 4.53ms Time], IncrementalHoareTripleChecker [240 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 360.28ms Time] [2021-11-12 22:53:19,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-12 22:53:19,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 110. [2021-11-12 22:53:19,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 86 states have internal predecessors, (91), 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) [2021-11-12 22:53:19,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 133 transitions. [2021-11-12 22:53:19,027 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 133 transitions. Word has length 343 [2021-11-12 22:53:19,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:19,028 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 133 transitions. [2021-11-12 22:53:19,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 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) [2021-11-12 22:53:19,028 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 133 transitions. [2021-11-12 22:53:19,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 665 [2021-11-12 22:53:19,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:19,035 INFO L514 BasicCegarLoop]: trace histogram [70, 65, 57, 36, 36, 36, 36, 33, 33, 33, 33, 33, 32, 32, 31, 31, 21, 13, 1, 1, 1] [2021-11-12 22:53:19,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:19,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:19,251 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:19,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:19,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1199324559, now seen corresponding path program 8 times [2021-11-12 22:53:19,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:19,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622436524] [2021-11-12 22:53:19,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:19,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:19,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:19,610 INFO L134 CoverageAnalysis]: Checked inductivity of 16045 backedges. 971 proven. 3742 refuted. 0 times theorem prover too weak. 11332 trivial. 0 not checked. [2021-11-12 22:53:19,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:19,610 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622436524] [2021-11-12 22:53:19,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622436524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:19,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886225843] [2021-11-12 22:53:19,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:53:19,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:19,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:19,614 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:19,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 22:53:19,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-11-12 22:53:19,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:19,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-12 22:53:19,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:21,244 INFO L134 CoverageAnalysis]: Checked inductivity of 16045 backedges. 4568 proven. 1093 refuted. 0 times theorem prover too weak. 10384 trivial. 0 not checked. [2021-11-12 22:53:21,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:27,359 INFO L134 CoverageAnalysis]: Checked inductivity of 16045 backedges. 4897 proven. 996 refuted. 0 times theorem prover too weak. 10152 trivial. 0 not checked. [2021-11-12 22:53:27,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886225843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:27,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74973381] [2021-11-12 22:53:27,365 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:27,365 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:27,366 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) [2021-11-12 22:53:27,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:27,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 29] total 55 [2021-11-12 22:53:27,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675638687] [2021-11-12 22:53:27,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:27,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-12 22:53:27,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:27,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-12 22:53:27,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=2578, Unknown=0, NotChecked=0, Total=2970 [2021-11-12 22:53:27,376 INFO L87 Difference]: Start difference. First operand 110 states and 133 transitions. Second operand has 55 states, 55 states have (on average 3.4) internal successors, (187), 55 states have internal predecessors, (187), 24 states have call successors, (27), 5 states have call predecessors, (27), 19 states have return successors, (43), 36 states have call predecessors, (43), 20 states have call successors, (43) [2021-11-12 22:53:29,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:29,069 INFO L93 Difference]: Finished difference Result 287 states and 392 transitions. [2021-11-12 22:53:29,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-12 22:53:29,069 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.4) internal successors, (187), 55 states have internal predecessors, (187), 24 states have call successors, (27), 5 states have call predecessors, (27), 19 states have return successors, (43), 36 states have call predecessors, (43), 20 states have call successors, (43) Word has length 664 [2021-11-12 22:53:29,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:29,072 INFO L225 Difference]: With dead ends: 287 [2021-11-12 22:53:29,073 INFO L226 Difference]: Without dead ends: 181 [2021-11-12 22:53:29,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1404 GetRequests, 1304 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1631, Invalid=8671, Unknown=0, NotChecked=0, Total=10302 [2021-11-12 22:53:29,078 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 378 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 702 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 400.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.29ms SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 472.26ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:29,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 82 Invalid, 928 Unknown, 0 Unchecked, 6.29ms Time], IncrementalHoareTripleChecker [226 Valid, 702 Invalid, 0 Unknown, 0 Unchecked, 472.26ms Time] [2021-11-12 22:53:29,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-12 22:53:29,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 143. [2021-11-12 22:53:29,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 112 states have internal predecessors, (117), 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) [2021-11-12 22:53:29,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 190 transitions. [2021-11-12 22:53:29,091 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 190 transitions. Word has length 664 [2021-11-12 22:53:29,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:29,092 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 190 transitions. [2021-11-12 22:53:29,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.4) internal successors, (187), 55 states have internal predecessors, (187), 24 states have call successors, (27), 5 states have call predecessors, (27), 19 states have return successors, (43), 36 states have call predecessors, (43), 20 states have call successors, (43) [2021-11-12 22:53:29,092 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 190 transitions. [2021-11-12 22:53:29,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 815 [2021-11-12 22:53:29,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:29,100 INFO L514 BasicCegarLoop]: trace histogram [84, 82, 68, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 40, 40, 26, 16, 1, 1, 1] [2021-11-12 22:53:29,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:29,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-12 22:53:29,323 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:29,324 INFO L85 PathProgramCache]: Analyzing trace with hash 2062038860, now seen corresponding path program 9 times [2021-11-12 22:53:29,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:29,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241440953] [2021-11-12 22:53:29,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:29,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:29,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:29,764 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2275 proven. 5134 refuted. 0 times theorem prover too weak. 16766 trivial. 0 not checked. [2021-11-12 22:53:29,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:29,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241440953] [2021-11-12 22:53:29,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241440953] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:29,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450494163] [2021-11-12 22:53:29,765 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:53:29,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:29,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:29,771 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:29,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 22:53:30,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:53:30,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:30,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 1014 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-12 22:53:30,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:31,365 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2669 proven. 5499 refuted. 0 times theorem prover too weak. 16007 trivial. 0 not checked. [2021-11-12 22:53:31,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:35,754 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2669 proven. 5667 refuted. 0 times theorem prover too weak. 15839 trivial. 0 not checked. [2021-11-12 22:53:35,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450494163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:35,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496275129] [2021-11-12 22:53:35,763 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:35,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:35,764 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) [2021-11-12 22:53:35,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:35,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 31] total 36 [2021-11-12 22:53:35,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913905521] [2021-11-12 22:53:35,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:35,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 22:53:35,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:35,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 22:53:35,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1052, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 22:53:35,772 INFO L87 Difference]: Start difference. First operand 143 states and 190 transitions. Second operand has 36 states, 36 states have (on average 5.416666666666667) internal successors, (195), 36 states have internal predecessors, (195), 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) [2021-11-12 22:53:36,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:36,774 INFO L93 Difference]: Finished difference Result 333 states and 485 transitions. [2021-11-12 22:53:36,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-12 22:53:36,775 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.416666666666667) internal successors, (195), 36 states have internal predecessors, (195), 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 814 [2021-11-12 22:53:36,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:36,779 INFO L225 Difference]: With dead ends: 333 [2021-11-12 22:53:36,779 INFO L226 Difference]: Without dead ends: 194 [2021-11-12 22:53:36,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1689 GetRequests, 1622 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1076, Invalid=3346, Unknown=0, NotChecked=0, Total=4422 [2021-11-12 22:53:36,784 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 740 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 517 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 401.80ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 740 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 1085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.11ms SdHoareTripleChecker+Time, 517 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 489.43ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:36,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [740 Valid, 171 Invalid, 1085 Unknown, 0 Unchecked, 7.11ms Time], IncrementalHoareTripleChecker [517 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 489.43ms Time] [2021-11-12 22:53:36,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-12 22:53:36,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 181. [2021-11-12 22:53:36,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 146 states have (on average 1.0342465753424657) internal successors, (151), 142 states have internal predecessors, (151), 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) [2021-11-12 22:53:36,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 238 transitions. [2021-11-12 22:53:36,800 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 238 transitions. Word has length 814 [2021-11-12 22:53:36,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:36,802 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 238 transitions. [2021-11-12 22:53:36,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.416666666666667) internal successors, (195), 36 states have internal predecessors, (195), 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) [2021-11-12 22:53:36,802 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 238 transitions. [2021-11-12 22:53:36,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 815 [2021-11-12 22:53:36,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:36,810 INFO L514 BasicCegarLoop]: trace histogram [84, 82, 68, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 40, 40, 26, 16, 1, 1, 1] [2021-11-12 22:53:36,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:37,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:37,027 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:37,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:37,028 INFO L85 PathProgramCache]: Analyzing trace with hash 528555464, now seen corresponding path program 10 times [2021-11-12 22:53:37,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:37,028 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044671798] [2021-11-12 22:53:37,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:37,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:37,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:37,505 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2270 proven. 4945 refuted. 0 times theorem prover too weak. 16960 trivial. 0 not checked. [2021-11-12 22:53:37,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:37,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044671798] [2021-11-12 22:53:37,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044671798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:37,506 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981069718] [2021-11-12 22:53:37,506 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:53:37,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:37,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:37,507 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:37,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-12 22:53:37,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:37,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 1536 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:53:37,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:39,136 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 12343 proven. 2667 refuted. 0 times theorem prover too weak. 9165 trivial. 0 not checked. [2021-11-12 22:53:39,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:42,937 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2261 proven. 5308 refuted. 0 times theorem prover too weak. 16606 trivial. 0 not checked. [2021-11-12 22:53:42,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981069718] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:42,938 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1971421809] [2021-11-12 22:53:42,940 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:53:42,940 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:53:42,941 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) [2021-11-12 22:53:42,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:53:42,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 27] total 32 [2021-11-12 22:53:42,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79367502] [2021-11-12 22:53:42,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:53:42,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 22:53:42,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:53:42,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 22:53:42,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:53:42,947 INFO L87 Difference]: Start difference. First operand 181 states and 238 transitions. Second operand has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 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) [2021-11-12 22:53:43,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:53:43,764 INFO L93 Difference]: Finished difference Result 359 states and 488 transitions. [2021-11-12 22:53:43,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-12 22:53:43,765 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 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 814 [2021-11-12 22:53:43,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:53:43,769 INFO L225 Difference]: With dead ends: 359 [2021-11-12 22:53:43,769 INFO L226 Difference]: Without dead ends: 182 [2021-11-12 22:53:43,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1672 GetRequests, 1622 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 22:53:43,774 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 370 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 286 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 389.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.01ms SdHoareTripleChecker+Time, 286 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 484.44ms IncrementalHoareTripleChecker+Time [2021-11-12 22:53:43,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 198 Invalid, 889 Unknown, 0 Unchecked, 6.01ms Time], IncrementalHoareTripleChecker [286 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 484.44ms Time] [2021-11-12 22:53:43,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-12 22:53:43,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 146. [2021-11-12 22:53:43,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 115 states have internal predecessors, (120), 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) [2021-11-12 22:53:43,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 184 transitions. [2021-11-12 22:53:43,794 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 184 transitions. Word has length 814 [2021-11-12 22:53:43,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:53:43,797 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 184 transitions. [2021-11-12 22:53:43,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 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) [2021-11-12 22:53:43,797 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 184 transitions. [2021-11-12 22:53:43,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1732 [2021-11-12 22:53:43,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:53:43,827 INFO L514 BasicCegarLoop]: trace histogram [178, 175, 144, 89, 89, 89, 89, 88, 88, 88, 88, 88, 87, 87, 86, 86, 55, 34, 1, 1, 1] [2021-11-12 22:53:43,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-12 22:53:44,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:44,051 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:53:44,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:53:44,052 INFO L85 PathProgramCache]: Analyzing trace with hash 894786304, now seen corresponding path program 11 times [2021-11-12 22:53:44,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:53:44,052 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59365528] [2021-11-12 22:53:44,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:44,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:53:44,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 110449 backedges. 4323 proven. 14460 refuted. 0 times theorem prover too weak. 91666 trivial. 0 not checked. [2021-11-12 22:53:45,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:45,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59365528] [2021-11-12 22:53:45,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59365528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:45,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001445952] [2021-11-12 22:53:45,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:53:45,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:45,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:45,116 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:45,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-12 22:53:45,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 85 check-sat command(s) [2021-11-12 22:53:45,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:45,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 2067 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-12 22:53:45,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:49,387 INFO L134 CoverageAnalysis]: Checked inductivity of 110449 backedges. 33815 proven. 7802 refuted. 0 times theorem prover too weak. 68832 trivial. 0 not checked. [2021-11-12 22:53:49,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:54:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 110449 backedges. 34992 proven. 7339 refuted. 0 times theorem prover too weak. 68118 trivial. 0 not checked. [2021-11-12 22:54:18,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001445952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:54:18,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1271265965] [2021-11-12 22:54:18,688 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:54:18,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:54:18,689 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) [2021-11-12 22:54:18,690 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:54:18,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24, 41] total 73 [2021-11-12 22:54:18,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257278760] [2021-11-12 22:54:18,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:54:18,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-12 22:54:18,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:54:18,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-12 22:54:18,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=677, Invalid=4579, Unknown=0, NotChecked=0, Total=5256 [2021-11-12 22:54:18,699 INFO L87 Difference]: Start difference. First operand 146 states and 184 transitions. Second operand has 73 states, 73 states have (on average 3.4383561643835616) internal successors, (251), 73 states have internal predecessors, (251), 31 states have call successors, (35), 3 states have call predecessors, (35), 28 states have return successors, (63), 52 states have call predecessors, (63), 29 states have call successors, (63) [2021-11-12 22:54:22,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:54:22,616 INFO L93 Difference]: Finished difference Result 439 states and 651 transitions. [2021-11-12 22:54:22,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-12 22:54:22,617 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.4383561643835616) internal successors, (251), 73 states have internal predecessors, (251), 31 states have call successors, (35), 3 states have call predecessors, (35), 28 states have return successors, (63), 52 states have call predecessors, (63), 29 states have call successors, (63) Word has length 1731 [2021-11-12 22:54:22,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:54:22,626 INFO L225 Difference]: With dead ends: 439 [2021-11-12 22:54:22,626 INFO L226 Difference]: Without dead ends: 297 [2021-11-12 22:54:22,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3581 GetRequests, 3427 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8207 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3228, Invalid=20952, Unknown=0, NotChecked=0, Total=24180 [2021-11-12 22:54:22,639 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 646 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 1924 mSolverCounterSat, 482 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1050.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 2406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.41ms SdHoareTripleChecker+Time, 482 IncrementalHoareTripleChecker+Valid, 1924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1256.67ms IncrementalHoareTripleChecker+Time [2021-11-12 22:54:22,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [646 Valid, 163 Invalid, 2406 Unknown, 0 Unchecked, 12.41ms Time], IncrementalHoareTripleChecker [482 Valid, 1924 Invalid, 0 Unknown, 0 Unchecked, 1256.67ms Time] [2021-11-12 22:54:22,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-11-12 22:54:22,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 244. [2021-11-12 22:54:22,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 196 states have (on average 1.0255102040816326) internal successors, (201), 192 states have internal predecessors, (201), 31 states have call successors, (31), 20 states have call predecessors, (31), 16 states have return successors, (127), 31 states have call predecessors, (127), 30 states have call successors, (127) [2021-11-12 22:54:22,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 359 transitions. [2021-11-12 22:54:22,664 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 359 transitions. Word has length 1731 [2021-11-12 22:54:22,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:54:22,665 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 359 transitions. [2021-11-12 22:54:22,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.4383561643835616) internal successors, (251), 73 states have internal predecessors, (251), 31 states have call successors, (35), 3 states have call predecessors, (35), 28 states have return successors, (63), 52 states have call predecessors, (63), 29 states have call successors, (63) [2021-11-12 22:54:22,666 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 359 transitions. [2021-11-12 22:54:22,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4335 [2021-11-12 22:54:22,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:54:22,868 INFO L514 BasicCegarLoop]: trace histogram [443, 441, 358, 221, 221, 221, 221, 221, 221, 221, 221, 221, 220, 220, 219, 219, 137, 85, 1, 1, 1] [2021-11-12 22:54:22,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:54:23,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:54:23,090 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:54:23,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:54:23,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1834971600, now seen corresponding path program 12 times [2021-11-12 22:54:23,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:54:23,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180317350] [2021-11-12 22:54:23,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:54:23,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:54:24,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:54:26,958 INFO L134 CoverageAnalysis]: Checked inductivity of 695970 backedges. 8757 proven. 50423 refuted. 0 times theorem prover too weak. 636790 trivial. 0 not checked. [2021-11-12 22:54:26,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:54:26,960 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180317350] [2021-11-12 22:54:26,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180317350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:54:26,960 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045470226] [2021-11-12 22:54:26,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:54:26,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:54:26,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:54:26,962 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:54:26,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-12 22:54:28,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:54:28,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:54:28,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 5365 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-12 22:54:28,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:54:34,433 INFO L134 CoverageAnalysis]: Checked inductivity of 695970 backedges. 237581 proven. 5527 refuted. 0 times theorem prover too weak. 452862 trivial. 0 not checked. [2021-11-12 22:54:34,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:54:49,516 INFO L134 CoverageAnalysis]: Checked inductivity of 695970 backedges. 7598 proven. 51957 refuted. 0 times theorem prover too weak. 636415 trivial. 0 not checked. [2021-11-12 22:54:49,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045470226] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:54:49,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [460285138] [2021-11-12 22:54:49,520 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:54:49,521 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:54:49,521 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) [2021-11-12 22:54:49,522 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:54:49,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 31] total 33 [2021-11-12 22:54:49,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501268902] [2021-11-12 22:54:49,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:54:49,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-12 22:54:49,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:54:49,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-12 22:54:49,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=873, Unknown=0, NotChecked=0, Total=1056 [2021-11-12 22:54:49,532 INFO L87 Difference]: Start difference. First operand 244 states and 359 transitions. Second operand has 33 states, 33 states have (on average 6.242424242424242) internal successors, (206), 33 states have internal predecessors, (206), 30 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (47), 16 states have call predecessors, (47), 30 states have call successors, (47) [2021-11-12 22:54:50,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:54:50,150 INFO L93 Difference]: Finished difference Result 473 states and 734 transitions. [2021-11-12 22:54:50,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-12 22:54:50,153 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 6.242424242424242) internal successors, (206), 33 states have internal predecessors, (206), 30 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (47), 16 states have call predecessors, (47), 30 states have call successors, (47) Word has length 4334 [2021-11-12 22:54:50,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:54:50,157 INFO L225 Difference]: With dead ends: 473 [2021-11-12 22:54:50,158 INFO L226 Difference]: Without dead ends: 233 [2021-11-12 22:54:50,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8719 GetRequests, 8665 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=724, Invalid=2138, Unknown=0, NotChecked=0, Total=2862 [2021-11-12 22:54:50,163 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 332 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 322.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 1047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.47ms SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 396.34ms IncrementalHoareTripleChecker+Time [2021-11-12 22:54:50,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 242 Invalid, 1047 Unknown, 0 Unchecked, 3.47ms Time], IncrementalHoareTripleChecker [275 Valid, 772 Invalid, 0 Unknown, 0 Unchecked, 396.34ms Time] [2021-11-12 22:54:50,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-12 22:54:50,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 185. [2021-11-12 22:54:50,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 146 states have internal predecessors, (151), 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) [2021-11-12 22:54:50,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 255 transitions. [2021-11-12 22:54:50,181 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 255 transitions. Word has length 4334 [2021-11-12 22:54:50,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:54:50,183 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 255 transitions. [2021-11-12 22:54:50,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 6.242424242424242) internal successors, (206), 33 states have internal predecessors, (206), 30 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (47), 16 states have call predecessors, (47), 30 states have call successors, (47) [2021-11-12 22:54:50,184 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 255 transitions. [2021-11-12 22:54:50,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3223 [2021-11-12 22:54:50,270 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:54:50,272 INFO L514 BasicCegarLoop]: trace histogram [330, 327, 267, 165, 165, 165, 165, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1] [2021-11-12 22:54:50,303 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-12 22:54:50,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:54:50,479 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:54:50,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:54:50,480 INFO L85 PathProgramCache]: Analyzing trace with hash 800786632, now seen corresponding path program 13 times [2021-11-12 22:54:50,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:54:50,480 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014882143] [2021-11-12 22:54:50,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:54:50,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:54:51,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:54:52,730 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 8292 proven. 33199 refuted. 0 times theorem prover too weak. 342693 trivial. 0 not checked. [2021-11-12 22:54:52,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:54:52,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014882143] [2021-11-12 22:54:52,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014882143] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:54:52,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241141282] [2021-11-12 22:54:52,731 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:54:52,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:54:52,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:54:52,739 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:54:52,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-12 22:54:54,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:54:54,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 5984 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-12 22:54:54,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:54:58,644 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 180306 proven. 20720 refuted. 0 times theorem prover too weak. 183158 trivial. 0 not checked. [2021-11-12 22:54:58,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:09,208 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 9938 proven. 37065 refuted. 0 times theorem prover too weak. 337181 trivial. 0 not checked. [2021-11-12 22:55:09,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241141282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:55:09,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409235604] [2021-11-12 22:55:09,212 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:55:09,212 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:55:09,212 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) [2021-11-12 22:55:09,214 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:55:09,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 37] total 42 [2021-11-12 22:55:09,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78835535] [2021-11-12 22:55:09,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:55:09,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-12 22:55:09,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:09,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-12 22:55:09,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2021-11-12 22:55:09,226 INFO L87 Difference]: Start difference. First operand 185 states and 255 transitions. Second operand has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-12 22:55:10,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:10,814 INFO L93 Difference]: Finished difference Result 471 states and 704 transitions. [2021-11-12 22:55:10,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-12 22:55:10,816 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) Word has length 3222 [2021-11-12 22:55:10,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:10,824 INFO L225 Difference]: With dead ends: 471 [2021-11-12 22:55:10,825 INFO L226 Difference]: Without dead ends: 290 [2021-11-12 22:55:10,829 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6535 GetRequests, 6440 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2152 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2082, Invalid=6848, Unknown=0, NotChecked=0, Total=8930 [2021-11-12 22:55:10,830 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 1442 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 1020 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 603.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1442 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 1790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.20ms SdHoareTripleChecker+Time, 1020 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 722.53ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:10,830 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1442 Valid, 209 Invalid, 1790 Unknown, 0 Unchecked, 6.20ms Time], IncrementalHoareTripleChecker [1020 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 722.53ms Time] [2021-11-12 22:55:10,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-12 22:55:10,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 235. [2021-11-12 22:55:10,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 190 states have (on average 1.0263157894736843) internal successors, (195), 186 states have internal predecessors, (195), 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) [2021-11-12 22:55:10,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 321 transitions. [2021-11-12 22:55:10,849 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 321 transitions. Word has length 3222 [2021-11-12 22:55:10,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:10,852 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 321 transitions. [2021-11-12 22:55:10,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-12 22:55:10,852 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 321 transitions. [2021-11-12 22:55:10,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2149 [2021-11-12 22:55:10,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:10,895 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] [2021-11-12 22:55:10,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:11,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:11,123 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:55:11,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:11,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1593613230, now seen corresponding path program 14 times [2021-11-12 22:55:11,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:11,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265870679] [2021-11-12 22:55:11,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:11,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:11,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:12,354 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 8354 proven. 19339 refuted. 0 times theorem prover too weak. 142625 trivial. 0 not checked. [2021-11-12 22:55:12,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:12,354 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265870679] [2021-11-12 22:55:12,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265870679] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:12,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052933780] [2021-11-12 22:55:12,356 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:55:12,356 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:12,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:12,357 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:12,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-12 22:55:13,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-12 22:55:13,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:55:13,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-12 22:55:13,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:55:17,063 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 9766 proven. 14976 refuted. 0 times theorem prover too weak. 145576 trivial. 0 not checked. [2021-11-12 22:55:17,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:25,733 INFO L134 CoverageAnalysis]: Checked inductivity of 170318 backedges. 9758 proven. 15190 refuted. 0 times theorem prover too weak. 145370 trivial. 0 not checked. [2021-11-12 22:55:25,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052933780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:55:25,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383733018] [2021-11-12 22:55:25,736 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:55:25,736 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:55:25,737 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) [2021-11-12 22:55:25,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:55:25,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 32] total 43 [2021-11-12 22:55:25,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886126508] [2021-11-12 22:55:25,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:55:25,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-12 22:55:25,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:25,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-12 22:55:25,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1494, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:55:25,744 INFO L87 Difference]: Start difference. First operand 235 states and 321 transitions. Second operand has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) [2021-11-12 22:55:27,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:27,151 INFO L93 Difference]: Finished difference Result 494 states and 710 transitions. [2021-11-12 22:55:27,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-12 22:55:27,152 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) Word has length 2148 [2021-11-12 22:55:27,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:27,158 INFO L225 Difference]: With dead ends: 494 [2021-11-12 22:55:27,159 INFO L226 Difference]: Without dead ends: 263 [2021-11-12 22:55:27,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4357 GetRequests, 4275 SyntacticMatches, 14 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1145, Invalid=3685, Unknown=0, NotChecked=0, Total=4830 [2021-11-12 22:55:27,163 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 703 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 1195 mSolverCounterSat, 801 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 760.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 703 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 1996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.06ms SdHoareTripleChecker+Time, 801 IncrementalHoareTripleChecker+Valid, 1195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 937.06ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:27,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [703 Valid, 353 Invalid, 1996 Unknown, 0 Unchecked, 7.06ms Time], IncrementalHoareTripleChecker [801 Valid, 1195 Invalid, 0 Unknown, 0 Unchecked, 937.06ms Time] [2021-11-12 22:55:27,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-12 22:55:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 194. [2021-11-12 22:55:27,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 154 states have internal predecessors, (159), 26 states have call successors, (26), 19 states have call predecessors, (26), 11 states have return successors, (70), 20 states have call predecessors, (70), 25 states have call successors, (70) [2021-11-12 22:55:27,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 255 transitions. [2021-11-12 22:55:27,190 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 255 transitions. Word has length 2148 [2021-11-12 22:55:27,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:27,192 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 255 transitions. [2021-11-12 22:55:27,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) [2021-11-12 22:55:27,193 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 255 transitions. [2021-11-12 22:55:27,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5230 [2021-11-12 22:55:27,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:27,530 INFO L514 BasicCegarLoop]: trace histogram [535, 531, 433, 268, 268, 268, 268, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1] [2021-11-12 22:55:27,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:27,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-12 22:55:27,730 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:55:27,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:27,733 INFO L85 PathProgramCache]: Analyzing trace with hash -689990423, now seen corresponding path program 15 times [2021-11-12 22:55:27,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:27,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52382788] [2021-11-12 22:55:27,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:27,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:29,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1013638 backedges. 14730 proven. 60403 refuted. 0 times theorem prover too weak. 938505 trivial. 0 not checked. [2021-11-12 22:55:32,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:32,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52382788] [2021-11-12 22:55:32,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52382788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:32,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196965149] [2021-11-12 22:55:32,222 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:55:32,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:32,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:32,224 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:32,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-12 22:55:33,588 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:55:33,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:55:33,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 6472 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-12 22:55:33,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:55:40,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1013638 backedges. 467153 proven. 37926 refuted. 0 times theorem prover too weak. 508559 trivial. 0 not checked. [2021-11-12 22:55:40,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:57,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1013638 backedges. 17523 proven. 66730 refuted. 0 times theorem prover too weak. 929385 trivial. 0 not checked. [2021-11-12 22:55:57,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196965149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:55:57,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1253666215] [2021-11-12 22:55:57,138 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:55:57,138 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:55:57,139 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) [2021-11-12 22:55:57,140 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:55:57,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 40] total 45 [2021-11-12 22:55:57,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136022839] [2021-11-12 22:55:57,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:55:57,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-12 22:55:57,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:57,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-12 22:55:57,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1694, Unknown=0, NotChecked=0, Total=1980 [2021-11-12 22:55:57,153 INFO L87 Difference]: Start difference. First operand 194 states and 255 transitions. Second operand has 45 states, 45 states have (on average 5.933333333333334) internal successors, (267), 45 states have internal predecessors, (267), 40 states have call successors, (47), 5 states have call predecessors, (47), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-12 22:55:58,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:58,810 INFO L93 Difference]: Finished difference Result 511 states and 721 transitions. [2021-11-12 22:55:58,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-12 22:55:58,811 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 5.933333333333334) internal successors, (267), 45 states have internal predecessors, (267), 40 states have call successors, (47), 5 states have call predecessors, (47), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) Word has length 5229 [2021-11-12 22:55:58,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:58,819 INFO L225 Difference]: With dead ends: 511 [2021-11-12 22:55:58,819 INFO L226 Difference]: Without dead ends: 321 [2021-11-12 22:55:58,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10563 GetRequests, 10454 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2985 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2724, Invalid=9048, Unknown=0, NotChecked=0, Total=11772 [2021-11-12 22:55:58,824 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 987 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 776 mSolverCounterSat, 537 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 458.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 987 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 1313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.48ms SdHoareTripleChecker+Time, 537 IncrementalHoareTripleChecker+Valid, 776 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 571.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:58,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [987 Valid, 215 Invalid, 1313 Unknown, 0 Unchecked, 4.48ms Time], IncrementalHoareTripleChecker [537 Valid, 776 Invalid, 0 Unknown, 0 Unchecked, 571.46ms Time] [2021-11-12 22:55:58,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-11-12 22:55:58,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 207. [2021-11-12 22:55:58,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 165 states have internal predecessors, (169), 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) [2021-11-12 22:55:58,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 278 transitions. [2021-11-12 22:55:58,846 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 278 transitions. Word has length 5229 [2021-11-12 22:55:58,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:58,849 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 278 transitions. [2021-11-12 22:55:58,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 5.933333333333334) internal successors, (267), 45 states have internal predecessors, (267), 40 states have call successors, (47), 5 states have call predecessors, (47), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-12 22:55:58,850 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 278 transitions. [2021-11-12 22:55:58,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2810 [2021-11-12 22:55:58,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:58,919 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] [2021-11-12 22:55:58,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:59,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-12 22:55:59,119 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:55:59,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:59,120 INFO L85 PathProgramCache]: Analyzing trace with hash -436556749, now seen corresponding path program 16 times [2021-11-12 22:55:59,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:59,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075264152] [2021-11-12 22:55:59,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:59,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:59,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:02,449 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 50344 proven. 69909 refuted. 0 times theorem prover too weak. 171523 trivial. 0 not checked. [2021-11-12 22:56:02,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:02,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075264152] [2021-11-12 22:56:02,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075264152] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:02,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087942091] [2021-11-12 22:56:02,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:56:02,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:02,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:56:02,451 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:56:02,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-12 22:56:03,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:03,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 5222 conjuncts, 573 conjunts are in the unsatisfiable core [2021-11-12 22:56:03,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:09,837 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 49486 proven. 53497 refuted. 0 times theorem prover too weak. 188793 trivial. 0 not checked. [2021-11-12 22:56:09,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:31,411 WARN L227 SmtUtils]: Spent 5.10s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-12 22:57:36,654 WARN L227 SmtUtils]: Spent 5.21s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-12 22:57:41,829 WARN L227 SmtUtils]: Spent 5.14s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-12 22:58:49,902 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 53101 proven. 51887 refuted. 0 times theorem prover too weak. 186788 trivial. 0 not checked. [2021-11-12 22:58:49,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087942091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:58:49,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2072570290] [2021-11-12 22:58:49,905 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:58:49,906 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:58:49,906 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) [2021-11-12 22:58:49,908 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:58:49,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 53] total 73 [2021-11-12 22:58:49,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563720436] [2021-11-12 22:58:49,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:58:49,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-12 22:58:49,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:58:49,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-12 22:58:49,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=4249, Unknown=0, NotChecked=0, Total=5402 [2021-11-12 22:58:49,916 INFO L87 Difference]: Start difference. First operand 207 states and 278 transitions. Second operand has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 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) [2021-11-12 22:58:50,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:58:50,295 INFO L93 Difference]: Finished difference Result 238 states and 338 transitions. [2021-11-12 22:58:50,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-12 22:58:50,296 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 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 2809 [2021-11-12 22:58:50,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:58:50,306 INFO L225 Difference]: With dead ends: 238 [2021-11-12 22:58:50,306 INFO L226 Difference]: Without dead ends: 237 [2021-11-12 22:58:50,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6193 GetRequests, 6117 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1274, Invalid=4732, Unknown=0, NotChecked=0, Total=6006 [2021-11-12 22:58:50,309 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 95 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 191.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.69ms SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 247.73ms IncrementalHoareTripleChecker+Time [2021-11-12 22:58:50,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 408 Invalid, 404 Unknown, 0 Unchecked, 3.69ms Time], IncrementalHoareTripleChecker [74 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 247.73ms Time] [2021-11-12 22:58:50,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-12 22:58:50,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 227. [2021-11-12 22:58:50,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 180 states have internal predecessors, (185), 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) [2021-11-12 22:58:50,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 324 transitions. [2021-11-12 22:58:50,333 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 324 transitions. Word has length 2809 [2021-11-12 22:58:50,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:58:50,336 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 324 transitions. [2021-11-12 22:58:50,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 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) [2021-11-12 22:58:50,337 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 324 transitions. [2021-11-12 22:58:50,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8467 [2021-11-12 22:58:50,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:58:50,806 INFO L514 BasicCegarLoop]: trace histogram [865, 861, 700, 433, 433, 433, 433, 431, 431, 431, 431, 431, 430, 430, 429, 429, 267, 165, 1, 1, 1] [2021-11-12 22:58:50,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:58:51,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-12 22:58:51,007 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:58:51,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:58:51,009 INFO L85 PathProgramCache]: Analyzing trace with hash -139819960, now seen corresponding path program 17 times [2021-11-12 22:58:51,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:58:51,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809258854] [2021-11-12 22:58:51,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:58:51,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:58:54,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:59:01,567 INFO L134 CoverageAnalysis]: Checked inductivity of 2659990 backedges. 28168 proven. 113158 refuted. 0 times theorem prover too weak. 2518664 trivial. 0 not checked. [2021-11-12 22:59:01,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:59:01,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809258854] [2021-11-12 22:59:01,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809258854] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:59:01,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040503994] [2021-11-12 22:59:01,569 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:59:01,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:59:01,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:59:01,570 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:59:01,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06d5364d-bd64-47ea-8a1b-cdd12738b4a2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-12 22:59:16,129 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 452 check-sat command(s) [2021-11-12 22:59:16,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:59:16,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 11192 conjuncts, 1149 conjunts are in the unsatisfiable core [2021-11-12 22:59:16,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:59:32,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2659990 backedges. 821009 proven. 213263 refuted. 0 times theorem prover too weak. 1625718 trivial. 0 not checked. [2021-11-12 22:59:32,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:00:45,390 WARN L227 SmtUtils]: Spent 11.95s 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) [2021-11-12 23:00:57,355 WARN L227 SmtUtils]: Spent 11.90s 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) [2021-11-12 23:01:09,390 WARN L227 SmtUtils]: Spent 12.00s 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) [2021-11-12 23:01:21,524 WARN L227 SmtUtils]: Spent 12.07s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)