./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Fibonacci04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-24 10:24:17,004 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-24 10:24:17,007 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-24 10:24:17,065 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-24 10:24:17,066 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-24 10:24:17,071 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-24 10:24:17,074 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-24 10:24:17,080 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-24 10:24:17,083 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-24 10:24:17,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-24 10:24:17,095 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-24 10:24:17,097 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-24 10:24:17,098 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-24 10:24:17,102 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-24 10:24:17,105 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-24 10:24:17,111 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-24 10:24:17,113 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-24 10:24:17,114 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-24 10:24:17,118 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-24 10:24:17,127 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-24 10:24:17,130 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-24 10:24:17,132 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-24 10:24:17,136 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-24 10:24:17,138 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-24 10:24:17,149 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-24 10:24:17,150 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-24 10:24:17,150 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-24 10:24:17,153 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-24 10:24:17,154 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-24 10:24:17,156 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-24 10:24:17,157 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-24 10:24:17,158 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-24 10:24:17,161 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-24 10:24:17,163 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-24 10:24:17,165 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-24 10:24:17,165 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-24 10:24:17,167 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-24 10:24:17,167 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-24 10:24:17,167 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-24 10:24:17,169 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-24 10:24:17,170 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-24 10:24:17,171 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-24 10:24:17,228 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-24 10:24:17,233 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-24 10:24:17,235 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-24 10:24:17,235 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-24 10:24:17,235 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-24 10:24:17,236 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-24 10:24:17,236 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-24 10:24:17,236 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-24 10:24:17,244 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-24 10:24:17,245 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-24 10:24:17,246 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-24 10:24:17,247 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-24 10:24:17,247 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-24 10:24:17,248 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-24 10:24:17,248 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-24 10:24:17,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-24 10:24:17,249 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-24 10:24:17,250 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-24 10:24:17,250 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-24 10:24:17,250 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-24 10:24:17,251 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-24 10:24:17,251 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-24 10:24:17,251 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-24 10:24:17,251 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-24 10:24:17,252 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-24 10:24:17,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-24 10:24:17,252 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-24 10:24:17,253 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-24 10:24:17,253 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-24 10:24:17,253 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-24 10:24:17,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:24:17,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-24 10:24:17,254 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-24 10:24:17,255 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-24 10:24:17,255 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-24 10:24:17,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-24 10:24:17,256 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-24 10:24:17,256 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-24 10:24:17,256 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-24 10:24:17,256 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_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 [2021-10-24 10:24:17,683 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-24 10:24:17,741 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-24 10:24:17,745 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-24 10:24:17,746 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-24 10:24:17,748 INFO L275 PluginConnector]: CDTParser initialized [2021-10-24 10:24:17,749 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/../../sv-benchmarks/c/recursive/Fibonacci04.c [2021-10-24 10:24:17,836 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/data/6c8b1d05d/723635743e7347d9a4d0849c477ffa01/FLAG835526280 [2021-10-24 10:24:18,392 INFO L306 CDTParser]: Found 1 translation units. [2021-10-24 10:24:18,394 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/sv-benchmarks/c/recursive/Fibonacci04.c [2021-10-24 10:24:18,412 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/data/6c8b1d05d/723635743e7347d9a4d0849c477ffa01/FLAG835526280 [2021-10-24 10:24:18,739 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/data/6c8b1d05d/723635743e7347d9a4d0849c477ffa01 [2021-10-24 10:24:18,745 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-24 10:24:18,748 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-24 10:24:18,754 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-24 10:24:18,755 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-24 10:24:18,760 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-24 10:24:18,761 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:24:18" (1/1) ... [2021-10-24 10:24:18,764 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d46cfd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:18, skipping insertion in model container [2021-10-24 10:24:18,764 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:24:18" (1/1) ... [2021-10-24 10:24:18,774 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-24 10:24:18,795 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-24 10:24:19,016 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_7c48edd2-4f12-4a56-9a42-08f09a485d54/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-10-24 10:24:19,030 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:24:19,044 INFO L203 MainTranslator]: Completed pre-run [2021-10-24 10:24:19,066 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_7c48edd2-4f12-4a56-9a42-08f09a485d54/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-10-24 10:24:19,067 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:24:19,088 INFO L208 MainTranslator]: Completed translation [2021-10-24 10:24:19,089 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19 WrapperNode [2021-10-24 10:24:19,090 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-24 10:24:19,092 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-24 10:24:19,092 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-24 10:24:19,092 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-24 10:24:19,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,111 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,134 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-24 10:24:19,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-24 10:24:19,136 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-24 10:24:19,136 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-24 10:24:19,148 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,149 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,172 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,179 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-24 10:24:19,184 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-24 10:24:19,185 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-24 10:24:19,185 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-24 10:24:19,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (1/1) ... [2021-10-24 10:24:19,196 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:24:19,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:19,229 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-24 10:24:19,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-24 10:24:19,333 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-10-24 10:24:19,333 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-10-24 10:24:19,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-24 10:24:19,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-24 10:24:19,336 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-24 10:24:19,336 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-24 10:24:19,650 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-24 10:24:19,650 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-24 10:24:19,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:24:19 BoogieIcfgContainer [2021-10-24 10:24:19,653 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-24 10:24:19,655 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-24 10:24:19,655 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-24 10:24:19,660 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-24 10:24:19,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 10:24:18" (1/3) ... [2021-10-24 10:24:19,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f6d86af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:24:19, skipping insertion in model container [2021-10-24 10:24:19,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:24:19" (2/3) ... [2021-10-24 10:24:19,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f6d86af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:24:19, skipping insertion in model container [2021-10-24 10:24:19,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:24:19" (3/3) ... [2021-10-24 10:24:19,664 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2021-10-24 10:24:19,671 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-24 10:24:19,671 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-24 10:24:19,762 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-24 10:24:19,769 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 [2021-10-24 10:24:19,769 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-24 10:24:19,789 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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) [2021-10-24 10:24:19,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-24 10:24:19,796 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:19,797 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:19,798 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:19,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:19,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1615401540, now seen corresponding path program 1 times [2021-10-24 10:24:19,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:19,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172680299] [2021-10-24 10:24:19,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:19,821 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:19,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:20,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:24:20,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:20,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172680299] [2021-10-24 10:24:20,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172680299] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-24 10:24:20,158 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-24 10:24:20,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-24 10:24:20,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183838944] [2021-10-24 10:24:20,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-24 10:24:20,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:20,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-24 10:24:20,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-24 10:24:20,188 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:24:20,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:20,319 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-10-24 10:24:20,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-24 10:24:20,323 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-24 10:24:20,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:20,336 INFO L225 Difference]: With dead ends: 27 [2021-10-24 10:24:20,337 INFO L226 Difference]: Without dead ends: 17 [2021-10-24 10:24:20,341 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-24 10:24:20,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-10-24 10:24:20,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-10-24 10:24:20,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-24 10:24:20,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-10-24 10:24:20,387 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2021-10-24 10:24:20,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:20,388 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-10-24 10:24:20,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:24:20,388 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-10-24 10:24:20,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-24 10:24:20,390 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:20,390 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:20,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-24 10:24:20,391 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:20,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:20,392 INFO L82 PathProgramCache]: Analyzing trace with hash -2136894566, now seen corresponding path program 1 times [2021-10-24 10:24:20,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:20,393 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325946872] [2021-10-24 10:24:20,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:20,393 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:20,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:20,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:24:20,468 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:20,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325946872] [2021-10-24 10:24:20,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325946872] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-24 10:24:20,469 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-24 10:24:20,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-24 10:24:20,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296960520] [2021-10-24 10:24:20,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-24 10:24:20,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:20,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-24 10:24:20,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-24 10:24:20,473 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:24:20,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:20,530 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-10-24 10:24:20,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-24 10:24:20,531 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-24 10:24:20,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:20,533 INFO L225 Difference]: With dead ends: 23 [2021-10-24 10:24:20,533 INFO L226 Difference]: Without dead ends: 19 [2021-10-24 10:24:20,534 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-24 10:24:20,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-10-24 10:24:20,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2021-10-24 10:24:20,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-24 10:24:20,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-10-24 10:24:20,542 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2021-10-24 10:24:20,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:20,543 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-10-24 10:24:20,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:24:20,543 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-10-24 10:24:20,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-24 10:24:20,545 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:20,545 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:20,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-24 10:24:20,546 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:20,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:20,547 INFO L82 PathProgramCache]: Analyzing trace with hash -338238899, now seen corresponding path program 1 times [2021-10-24 10:24:20,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:20,548 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864287595] [2021-10-24 10:24:20,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:20,548 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:20,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:20,710 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-24 10:24:20,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:20,710 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864287595] [2021-10-24 10:24:20,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864287595] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:24:20,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390703807] [2021-10-24 10:24:20,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:20,712 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:20,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:20,725 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:24:20,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-24 10:24:20,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:20,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-24 10:24:20,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:24:21,026 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-24 10:24:21,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:24:21,494 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-24 10:24:21,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390703807] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:24:21,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [236170433] [2021-10-24 10:24:21,541 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-24 10:24:21,542 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:24:21,547 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:608) 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) [2021-10-24 10:24:21,548 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:24:21,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2021-10-24 10:24:21,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772755830] [2021-10-24 10:24:21,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-24 10:24:21,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:21,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-24 10:24:21,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-24 10:24:21,553 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-10-24 10:24:21,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:21,743 INFO L93 Difference]: Finished difference Result 41 states and 59 transitions. [2021-10-24 10:24:21,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-24 10:24:21,744 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) Word has length 22 [2021-10-24 10:24:21,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:21,749 INFO L225 Difference]: With dead ends: 41 [2021-10-24 10:24:21,749 INFO L226 Difference]: Without dead ends: 24 [2021-10-24 10:24:21,754 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 176.3ms TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2021-10-24 10:24:21,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-10-24 10:24:21,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-10-24 10:24:21,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-10-24 10:24:21,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2021-10-24 10:24:21,779 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 22 [2021-10-24 10:24:21,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:21,781 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2021-10-24 10:24:21,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-10-24 10:24:21,785 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2021-10-24 10:24:21,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-24 10:24:21,789 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:21,789 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:21,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-24 10:24:22,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-24 10:24:22,005 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:22,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:22,006 INFO L82 PathProgramCache]: Analyzing trace with hash 271867855, now seen corresponding path program 1 times [2021-10-24 10:24:22,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:22,007 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499132679] [2021-10-24 10:24:22,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:22,008 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:22,207 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-10-24 10:24:22,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:22,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499132679] [2021-10-24 10:24:22,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499132679] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:24:22,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509602477] [2021-10-24 10:24:22,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:22,209 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:22,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:22,225 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:24:22,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-24 10:24:22,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:22,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-24 10:24:22,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:24:22,551 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-10-24 10:24:22,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:24:23,199 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-10-24 10:24:23,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509602477] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:24:23,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902459859] [2021-10-24 10:24:23,211 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-24 10:24:23,211 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:24:23,212 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:608) 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) [2021-10-24 10:24:23,215 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:24:23,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 12 [2021-10-24 10:24:23,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315074901] [2021-10-24 10:24:23,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-24 10:24:23,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:23,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-24 10:24:23,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-10-24 10:24:23,219 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-10-24 10:24:23,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:23,394 INFO L93 Difference]: Finished difference Result 43 states and 73 transitions. [2021-10-24 10:24:23,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-24 10:24:23,396 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) Word has length 50 [2021-10-24 10:24:23,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:23,408 INFO L225 Difference]: With dead ends: 43 [2021-10-24 10:24:23,409 INFO L226 Difference]: Without dead ends: 37 [2021-10-24 10:24:23,410 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 139.4ms TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2021-10-24 10:24:23,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-10-24 10:24:23,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2021-10-24 10:24:23,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 23 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (30), 9 states have call predecessors, (30), 6 states have call successors, (30) [2021-10-24 10:24:23,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 59 transitions. [2021-10-24 10:24:23,444 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 59 transitions. Word has length 50 [2021-10-24 10:24:23,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:23,446 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 59 transitions. [2021-10-24 10:24:23,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-10-24 10:24:23,447 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 59 transitions. [2021-10-24 10:24:23,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-10-24 10:24:23,465 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:23,466 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:23,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-24 10:24:23,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:23,693 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:23,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:23,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1320545923, now seen corresponding path program 2 times [2021-10-24 10:24:23,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:23,695 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024779530] [2021-10-24 10:24:23,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:23,695 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:23,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:24,019 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 64 proven. 158 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-10-24 10:24:24,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:24,021 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024779530] [2021-10-24 10:24:24,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024779530] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:24:24,026 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527066721] [2021-10-24 10:24:24,026 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:24:24,026 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:24,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:24,033 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:24:24,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-24 10:24:24,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-10-24 10:24:24,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:24:24,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-24 10:24:24,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:24:24,635 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 12 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2021-10-24 10:24:24,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:24:25,541 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 14 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-10-24 10:24:25,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527066721] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:24:25,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936560511] [2021-10-24 10:24:25,545 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-24 10:24:25,545 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:24:25,545 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:608) 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) [2021-10-24 10:24:25,546 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:24:25,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2021-10-24 10:24:25,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031250408] [2021-10-24 10:24:25,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-24 10:24:25,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:25,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-24 10:24:25,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-10-24 10:24:25,549 INFO L87 Difference]: Start difference. First operand 34 states and 59 transitions. Second operand has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 15 states have internal predecessors, (47), 8 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (16), 9 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-24 10:24:25,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:25,947 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2021-10-24 10:24:25,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-24 10:24:25,948 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 15 states have internal predecessors, (47), 8 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (16), 9 states have call predecessors, (16), 8 states have call successors, (16) Word has length 103 [2021-10-24 10:24:25,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:25,951 INFO L225 Difference]: With dead ends: 91 [2021-10-24 10:24:25,951 INFO L226 Difference]: Without dead ends: 59 [2021-10-24 10:24:25,955 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 284.5ms TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2021-10-24 10:24:25,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-24 10:24:25,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2021-10-24 10:24:25,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 36 states have internal predecessors, (41), 10 states have call successors, (10), 5 states have call predecessors, (10), 8 states have return successors, (31), 14 states have call predecessors, (31), 10 states have call successors, (31) [2021-10-24 10:24:25,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 82 transitions. [2021-10-24 10:24:25,983 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 82 transitions. Word has length 103 [2021-10-24 10:24:25,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:25,986 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 82 transitions. [2021-10-24 10:24:25,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 15 states have internal predecessors, (47), 8 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (16), 9 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-24 10:24:25,988 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 82 transitions. [2021-10-24 10:24:25,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-10-24 10:24:25,994 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:25,994 INFO L512 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:26,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-24 10:24:26,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:26,209 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:26,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:26,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1362250110, now seen corresponding path program 3 times [2021-10-24 10:24:26,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:26,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47909990] [2021-10-24 10:24:26,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:26,211 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:26,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 231 proven. 68 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2021-10-24 10:24:26,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:26,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47909990] [2021-10-24 10:24:26,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47909990] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:24:26,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667921542] [2021-10-24 10:24:26,478 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:24:26,479 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:26,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:26,481 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:24:26,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-24 10:24:26,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:24:26,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:24:26,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-24 10:24:26,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:24:27,063 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 264 proven. 67 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2021-10-24 10:24:27,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:24:28,476 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 264 proven. 89 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2021-10-24 10:24:28,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667921542] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:24:28,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2120925053] [2021-10-24 10:24:28,488 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-24 10:24:28,488 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:24:28,489 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:608) 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) [2021-10-24 10:24:28,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:24:28,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 13] total 17 [2021-10-24 10:24:28,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352615452] [2021-10-24 10:24:28,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-24 10:24:28,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:28,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-24 10:24:28,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-10-24 10:24:28,498 INFO L87 Difference]: Start difference. First operand 56 states and 82 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (18), 9 states have call predecessors, (18), 10 states have call successors, (18) [2021-10-24 10:24:28,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:28,728 INFO L93 Difference]: Finished difference Result 77 states and 129 transitions. [2021-10-24 10:24:28,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-24 10:24:28,737 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (18), 9 states have call predecessors, (18), 10 states have call successors, (18) Word has length 119 [2021-10-24 10:24:28,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:28,749 INFO L225 Difference]: With dead ends: 77 [2021-10-24 10:24:28,749 INFO L226 Difference]: Without dead ends: 60 [2021-10-24 10:24:28,751 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 233 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 206.9ms TimeCoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2021-10-24 10:24:28,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-24 10:24:28,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-10-24 10:24:28,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 36 states have internal predecessors, (41), 10 states have call successors, (10), 5 states have call predecessors, (10), 8 states have return successors, (25), 14 states have call predecessors, (25), 10 states have call successors, (25) [2021-10-24 10:24:28,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 76 transitions. [2021-10-24 10:24:28,773 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 76 transitions. Word has length 119 [2021-10-24 10:24:28,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:28,778 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 76 transitions. [2021-10-24 10:24:28,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (18), 9 states have call predecessors, (18), 10 states have call successors, (18) [2021-10-24 10:24:28,778 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 76 transitions. [2021-10-24 10:24:28,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-10-24 10:24:28,785 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:28,786 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:28,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-24 10:24:29,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:29,001 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:29,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:29,001 INFO L82 PathProgramCache]: Analyzing trace with hash -82417497, now seen corresponding path program 4 times [2021-10-24 10:24:29,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:29,002 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437782365] [2021-10-24 10:24:29,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:29,002 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:29,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-24 10:24:29,041 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-24 10:24:29,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-24 10:24:29,139 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-10-24 10:24:29,139 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-24 10:24:29,140 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-24 10:24:29,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-24 10:24:29,154 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-24 10:24:29,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 10:24:29 BoogieIcfgContainer [2021-10-24 10:24:29,314 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-24 10:24:29,315 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-24 10:24:29,315 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-24 10:24:29,316 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-24 10:24:29,319 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:24:19" (3/4) ... [2021-10-24 10:24:29,322 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-24 10:24:29,432 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/witness.graphml [2021-10-24 10:24:29,441 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-24 10:24:29,443 INFO L168 Benchmark]: Toolchain (without parser) took 10693.33 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 60.1 MB in the beginning and 61.1 MB in the end (delta: -924.2 kB). Peak memory consumption was 22.7 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,444 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 96.5 MB. Free memory was 76.3 MB in the beginning and 76.1 MB in the end (delta: 134.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-24 10:24:29,445 INFO L168 Benchmark]: CACSL2BoogieTranslator took 335.71 ms. Allocated memory is still 96.5 MB. Free memory was 60.0 MB in the beginning and 50.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,445 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.82 ms. Allocated memory is still 96.5 MB. Free memory was 50.6 MB in the beginning and 49.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-24 10:24:29,446 INFO L168 Benchmark]: Boogie Preprocessor took 47.36 ms. Allocated memory is still 96.5 MB. Free memory was 49.2 MB in the beginning and 48.2 MB in the end (delta: 939.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,446 INFO L168 Benchmark]: RCFGBuilder took 469.58 ms. Allocated memory is still 96.5 MB. Free memory was 48.2 MB in the beginning and 68.4 MB in the end (delta: -20.1 MB). Peak memory consumption was 6.8 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,447 INFO L168 Benchmark]: TraceAbstraction took 9659.30 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 68.0 MB in the beginning and 66.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 24.3 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,447 INFO L168 Benchmark]: Witness Printer took 125.77 ms. Allocated memory is still 117.4 MB. Free memory was 66.3 MB in the beginning and 61.1 MB in the end (delta: 5.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-24 10:24:29,450 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 96.5 MB. Free memory was 76.3 MB in the beginning and 76.1 MB in the end (delta: 134.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 335.71 ms. Allocated memory is still 96.5 MB. Free memory was 60.0 MB in the beginning and 50.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 42.82 ms. Allocated memory is still 96.5 MB. Free memory was 50.6 MB in the beginning and 49.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 47.36 ms. Allocated memory is still 96.5 MB. Free memory was 49.2 MB in the beginning and 48.2 MB in the end (delta: 939.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 469.58 ms. Allocated memory is still 96.5 MB. Free memory was 48.2 MB in the beginning and 68.4 MB in the end (delta: -20.1 MB). Peak memory consumption was 6.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9659.30 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 68.0 MB in the beginning and 66.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 24.3 MB. Max. memory is 16.1 GB. * Witness Printer took 125.77 ms. Allocated memory is still 117.4 MB. Free memory was 66.3 MB in the beginning and 61.1 MB in the end (delta: 5.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 35]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L30] int x = __VERIFIER_nondet_int(); [L31] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L19] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L21] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L19] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L21] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L24] return fibonacci(n-1) + fibonacci(n-2); [L31] RET, EXPR fibonacci(x) [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) [L35] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 9389.4ms, OverallIterations: 7, TraceHistogramMax: 17, EmptinessCheckTime: 49.3ms, AutomataDifference: 1289.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 15.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 92 SDtfs, 145 SDslu, 238 SDs, 0 SdLazy, 492 SolverSat, 167 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 520.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 660 GetRequests, 574 SyntacticMatches, 5 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 876.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=5, InterpolantAutomatonStates: 55, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 136.4ms AutomataMinimizationTime, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 83.0ms SsaConstructionTime, 454.6ms SatisfiabilityAnalysisTime, 5568.1ms InterpolantComputationTime, 712 NumberOfCodeBlocks, 634 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 887 ConstructedInterpolants, 0 QuantifiedInterpolants, 1605 SizeOfPredicates, 13 NumberOfNonLiveVariables, 568 ConjunctsInSsa, 34 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 3667/4242 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-24 10:24:29,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7c48edd2-4f12-4a56-9a42-08f09a485d54/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...