./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 00:15:06,044 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 00:15:06,047 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 00:15:06,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 00:15:06,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 00:15:06,089 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 00:15:06,092 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 00:15:06,095 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 00:15:06,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 00:15:06,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 00:15:06,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 00:15:06,106 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 00:15:06,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 00:15:06,109 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 00:15:06,110 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 00:15:06,112 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 00:15:06,113 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 00:15:06,114 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 00:15:06,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 00:15:06,122 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 00:15:06,123 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 00:15:06,125 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 00:15:06,126 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 00:15:06,127 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 00:15:06,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 00:15:06,137 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 00:15:06,138 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 00:15:06,139 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 00:15:06,140 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 00:15:06,141 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 00:15:06,141 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 00:15:06,142 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 00:15:06,144 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 00:15:06,145 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 00:15:06,146 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 00:15:06,147 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 00:15:06,147 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 00:15:06,148 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 00:15:06,148 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 00:15:06,149 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 00:15:06,150 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 00:15:06,151 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-11-22 00:15:06,187 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 00:15:06,188 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 00:15:06,188 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 00:15:06,189 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 00:15:06,189 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 00:15:06,190 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 00:15:06,190 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 00:15:06,190 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 00:15:06,190 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 00:15:06,190 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 00:15:06,192 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 00:15:06,192 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 00:15:06,192 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 00:15:06,192 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 00:15:06,192 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 00:15:06,193 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 00:15:06,193 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 00:15:06,193 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 00:15:06,194 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 00:15:06,194 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 00:15:06,194 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-22 00:15:06,194 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 00:15:06,195 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 00:15:06,195 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 00:15:06,195 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 00:15:06,195 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 00:15:06,195 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 00:15:06,196 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-11-22 00:15:06,196 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 00:15:06,196 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 00:15:06,196 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 00:15:06,197 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 00:15:06,197 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 00:15:06,197 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 00:15:06,197 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:15:06,198 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 00:15:06,198 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 00:15:06,198 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 00:15:06,198 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 00:15:06,198 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 00:15:06,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 00:15:06,199 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 00:15:06,199 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 00:15:06,199 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 [2022-11-22 00:15:06,495 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 00:15:06,517 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 00:15:06,519 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 00:15:06,521 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 00:15:06,521 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 00:15:06,522 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/recursive/Fibonacci04.c [2022-11-22 00:15:09,562 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 00:15:09,734 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 00:15:09,734 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/sv-benchmarks/c/recursive/Fibonacci04.c [2022-11-22 00:15:09,739 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/data/1e667ebbf/1924808c3875466596d7f0c2e10915f9/FLAG28b839d77 [2022-11-22 00:15:09,763 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/data/1e667ebbf/1924808c3875466596d7f0c2e10915f9 [2022-11-22 00:15:09,766 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 00:15:09,768 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 00:15:09,775 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 00:15:09,775 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 00:15:09,779 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 00:15:09,780 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:09,781 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cd6ba8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09, skipping insertion in model container [2022-11-22 00:15:09,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:09,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 00:15:09,801 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 00:15:09,952 WARN L237 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_b0afa20d-7481-4b76-8d66-c748d1faa61d/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2022-11-22 00:15:09,952 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:15:09,963 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 00:15:09,976 WARN L237 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_b0afa20d-7481-4b76-8d66-c748d1faa61d/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2022-11-22 00:15:09,977 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:15:09,990 INFO L208 MainTranslator]: Completed translation [2022-11-22 00:15:09,991 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09 WrapperNode [2022-11-22 00:15:09,991 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 00:15:09,992 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 00:15:09,992 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 00:15:09,992 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 00:15:10,000 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,007 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,019 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 23 [2022-11-22 00:15:10,019 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 00:15:10,020 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 00:15:10,020 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 00:15:10,020 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 00:15:10,029 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,030 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,031 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,031 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,034 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,036 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,036 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,037 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,038 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 00:15:10,039 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 00:15:10,039 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 00:15:10,040 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 00:15:10,040 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (1/1) ... [2022-11-22 00:15:10,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:15:10,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:10,080 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 00:15:10,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 00:15:10,122 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2022-11-22 00:15:10,122 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2022-11-22 00:15:10,122 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 00:15:10,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 00:15:10,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 00:15:10,122 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 00:15:10,190 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 00:15:10,192 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 00:15:10,317 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 00:15:10,351 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 00:15:10,351 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-22 00:15:10,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:15:10 BoogieIcfgContainer [2022-11-22 00:15:10,354 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 00:15:10,357 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 00:15:10,357 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 00:15:10,361 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 00:15:10,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:15:09" (1/3) ... [2022-11-22 00:15:10,362 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c6cd722 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:15:10, skipping insertion in model container [2022-11-22 00:15:10,362 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:15:09" (2/3) ... [2022-11-22 00:15:10,362 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c6cd722 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:15:10, skipping insertion in model container [2022-11-22 00:15:10,362 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:15:10" (3/3) ... [2022-11-22 00:15:10,364 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2022-11-22 00:15:10,384 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 00:15:10,384 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2022-11-22 00:15:10,434 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 00:15:10,439 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ebd10ec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 00:15:10,440 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2022-11-22 00:15:10,443 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 00:15:10,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-22 00:15:10,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:10,450 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-22 00:15:10,451 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:10,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:10,456 INFO L85 PathProgramCache]: Analyzing trace with hash -2020330972, now seen corresponding path program 1 times [2022-11-22 00:15:10,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:10,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92816112] [2022-11-22 00:15:10,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:10,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:10,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:15:10,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:10,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92816112] [2022-11-22 00:15:10,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92816112] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:10,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:15:10,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:15:10,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716979225] [2022-11-22 00:15:10,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:10,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:15:10,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:10,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:15:10,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:10,773 INFO L87 Difference]: Start difference. First operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:15:10,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:10,868 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-11-22 00:15:10,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:15:10,871 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-22 00:15:10,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:10,878 INFO L225 Difference]: With dead ends: 25 [2022-11-22 00:15:10,878 INFO L226 Difference]: Without dead ends: 21 [2022-11-22 00:15:10,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:15:10,884 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:10,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 17 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:10,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-22 00:15:10,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-22 00:15:10,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:10,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-22 00:15:10,936 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 6 [2022-11-22 00:15:10,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:10,936 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-22 00:15:10,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:15:10,937 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-22 00:15:10,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 00:15:10,938 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:10,938 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:10,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 00:15:10,943 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:10,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:10,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1794249350, now seen corresponding path program 1 times [2022-11-22 00:15:10,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:10,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710897163] [2022-11-22 00:15:10,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:10,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:10,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 00:15:11,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:11,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710897163] [2022-11-22 00:15:11,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710897163] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:11,030 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:15:11,030 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 00:15:11,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243886886] [2022-11-22 00:15:11,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:11,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 00:15:11,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:11,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 00:15:11,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:15:11,042 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:15:11,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:11,089 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-22 00:15:11,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 00:15:11,097 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-22 00:15:11,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:11,099 INFO L225 Difference]: With dead ends: 23 [2022-11-22 00:15:11,099 INFO L226 Difference]: Without dead ends: 21 [2022-11-22 00:15:11,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 00:15:11,101 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 11 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:11,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 18 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:15:11,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-22 00:15:11,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-11-22 00:15:11,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:11,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-11-22 00:15:11,116 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2022-11-22 00:15:11,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:11,116 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-11-22 00:15:11,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 00:15:11,117 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-11-22 00:15:11,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-22 00:15:11,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:11,118 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:11,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 00:15:11,119 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:11,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:11,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1994508104, now seen corresponding path program 1 times [2022-11-22 00:15:11,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:11,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998815070] [2022-11-22 00:15:11,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:11,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:11,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:11,311 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 00:15:11,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:11,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998815070] [2022-11-22 00:15:11,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998815070] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:11,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:15:11,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 00:15:11,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805561147] [2022-11-22 00:15:11,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:11,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:15:11,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:11,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:15:11,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:11,315 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:11,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:11,362 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-11-22 00:15:11,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:15:11,363 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-11-22 00:15:11,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:11,364 INFO L225 Difference]: With dead ends: 35 [2022-11-22 00:15:11,364 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 00:15:11,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:11,366 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:11,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 45 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:15:11,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 00:15:11,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2022-11-22 00:15:11,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-22 00:15:11,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-11-22 00:15:11,383 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 22 [2022-11-22 00:15:11,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:11,383 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-11-22 00:15:11,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:11,384 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-11-22 00:15:11,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-22 00:15:11,385 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:11,385 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:11,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 00:15:11,386 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:11,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:11,386 INFO L85 PathProgramCache]: Analyzing trace with hash 389206339, now seen corresponding path program 1 times [2022-11-22 00:15:11,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:11,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466597626] [2022-11-22 00:15:11,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:11,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:11,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:11,573 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 00:15:11,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:11,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466597626] [2022-11-22 00:15:11,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466597626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:11,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011464667] [2022-11-22 00:15:11,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:11,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:11,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:11,582 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:11,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 00:15:11,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:11,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 00:15:11,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:11,800 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 00:15:11,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 00:15:12,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011464667] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:12,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [588141288] [2022-11-22 00:15:12,059 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 00:15:12,060 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:12,064 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:12,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:12,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2022-11-22 00:15:12,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090589531] [2022-11-22 00:15:12,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:12,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-22 00:15:12,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:12,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-22 00:15:12,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-22 00:15:12,068 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-22 00:15:12,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:12,475 INFO L93 Difference]: Finished difference Result 89 states and 127 transitions. [2022-11-22 00:15:12,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:15:12,476 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 29 [2022-11-22 00:15:12,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:12,481 INFO L225 Difference]: With dead ends: 89 [2022-11-22 00:15:12,482 INFO L226 Difference]: Without dead ends: 63 [2022-11-22 00:15:12,491 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2022-11-22 00:15:12,493 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 178 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:12,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 55 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:15:12,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-22 00:15:12,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2022-11-22 00:15:12,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 40 states have internal predecessors, (41), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-22 00:15:12,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2022-11-22 00:15:12,520 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 29 [2022-11-22 00:15:12,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:12,522 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2022-11-22 00:15:12,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-22 00:15:12,522 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2022-11-22 00:15:12,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 00:15:12,524 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:12,525 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:12,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:12,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:12,730 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:12,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:12,739 INFO L85 PathProgramCache]: Analyzing trace with hash -294911484, now seen corresponding path program 2 times [2022-11-22 00:15:12,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:12,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001686250] [2022-11-22 00:15:12,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:12,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:12,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:12,890 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 00:15:12,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:12,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001686250] [2022-11-22 00:15:12,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001686250] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:12,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165448818] [2022-11-22 00:15:12,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:15:12,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:12,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:12,897 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:12,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 00:15:12,953 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 00:15:12,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:12,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 00:15:12,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:13,006 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 00:15:13,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:15:13,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165448818] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:13,007 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 00:15:13,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-11-22 00:15:13,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39719663] [2022-11-22 00:15:13,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:13,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:15:13,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:13,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:15:13,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-22 00:15:13,009 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:13,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:13,041 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2022-11-22 00:15:13,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:15:13,044 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-11-22 00:15:13,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:13,045 INFO L225 Difference]: With dead ends: 59 [2022-11-22 00:15:13,046 INFO L226 Difference]: Without dead ends: 58 [2022-11-22 00:15:13,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-22 00:15:13,047 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 7 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:13,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 51 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:15:13,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-22 00:15:13,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2022-11-22 00:15:13,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-22 00:15:13,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2022-11-22 00:15:13,062 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 23 [2022-11-22 00:15:13,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:13,064 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2022-11-22 00:15:13,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:15:13,065 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2022-11-22 00:15:13,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-22 00:15:13,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:13,068 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:13,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:13,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:13,274 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:13,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:13,275 INFO L85 PathProgramCache]: Analyzing trace with hash 1400919893, now seen corresponding path program 1 times [2022-11-22 00:15:13,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:13,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546805696] [2022-11-22 00:15:13,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:13,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:13,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:13,419 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 00:15:13,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:13,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546805696] [2022-11-22 00:15:13,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546805696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:13,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203162591] [2022-11-22 00:15:13,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:13,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:13,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:13,422 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:13,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 00:15:13,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:13,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 00:15:13,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:13,542 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 00:15:13,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:13,606 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 00:15:13,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203162591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:13,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210091532] [2022-11-22 00:15:13,609 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:13,609 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:13,610 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:13,611 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:13,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2022-11-22 00:15:13,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091436899] [2022-11-22 00:15:13,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:13,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 00:15:13,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:13,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 00:15:13,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-11-22 00:15:13,613 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-22 00:15:13,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:13,742 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2022-11-22 00:15:13,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 00:15:13,742 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2022-11-22 00:15:13,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:13,744 INFO L225 Difference]: With dead ends: 68 [2022-11-22 00:15:13,744 INFO L226 Difference]: Without dead ends: 67 [2022-11-22 00:15:13,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-11-22 00:15:13,745 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:13,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 141 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:13,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-22 00:15:13,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2022-11-22 00:15:13,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 50 states have internal predecessors, (54), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2022-11-22 00:15:13,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-22 00:15:13,758 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 30 [2022-11-22 00:15:13,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:13,759 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-22 00:15:13,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-22 00:15:13,759 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-22 00:15:13,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 00:15:13,760 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:13,761 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:13,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:13,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:13,971 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:13,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:13,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1632818414, now seen corresponding path program 1 times [2022-11-22 00:15:13,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:13,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207638849] [2022-11-22 00:15:13,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:13,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:13,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:14,128 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-22 00:15:14,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:14,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207638849] [2022-11-22 00:15:14,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207638849] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:14,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273673233] [2022-11-22 00:15:14,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:14,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:14,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:14,135 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:14,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 00:15:14,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:14,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 00:15:14,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:14,303 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-22 00:15:14,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:14,530 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-22 00:15:14,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273673233] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:14,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [736767654] [2022-11-22 00:15:14,535 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:14,535 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:14,536 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:14,536 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:14,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2022-11-22 00:15:14,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482596250] [2022-11-22 00:15:14,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:14,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 00:15:14,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:14,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 00:15:14,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-22 00:15:14,539 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-22 00:15:14,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:14,766 INFO L93 Difference]: Finished difference Result 133 states and 198 transitions. [2022-11-22 00:15:14,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 00:15:14,767 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 49 [2022-11-22 00:15:14,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:14,778 INFO L225 Difference]: With dead ends: 133 [2022-11-22 00:15:14,778 INFO L226 Difference]: Without dead ends: 132 [2022-11-22 00:15:14,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2022-11-22 00:15:14,782 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 41 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:14,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 128 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:14,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-11-22 00:15:14,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2022-11-22 00:15:14,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-22 00:15:14,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2022-11-22 00:15:14,811 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 49 [2022-11-22 00:15:14,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:14,812 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2022-11-22 00:15:14,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-22 00:15:14,812 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2022-11-22 00:15:14,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-22 00:15:14,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:14,814 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2022-11-22 00:15:14,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:15,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:15,020 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:15,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:15,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1065907594, now seen corresponding path program 1 times [2022-11-22 00:15:15,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:15,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271502814] [2022-11-22 00:15:15,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:15,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:15,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:15,097 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2022-11-22 00:15:15,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:15,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271502814] [2022-11-22 00:15:15,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271502814] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:15,098 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:15:15,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 00:15:15,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187562104] [2022-11-22 00:15:15,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:15,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:15:15,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:15,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:15:15,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:15,100 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 00:15:15,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:15,143 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2022-11-22 00:15:15,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:15:15,144 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 62 [2022-11-22 00:15:15,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:15,146 INFO L225 Difference]: With dead ends: 110 [2022-11-22 00:15:15,146 INFO L226 Difference]: Without dead ends: 109 [2022-11-22 00:15:15,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:15,147 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:15,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 63 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:15:15,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-22 00:15:15,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2022-11-22 00:15:15,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-22 00:15:15,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2022-11-22 00:15:15,164 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 62 [2022-11-22 00:15:15,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:15,164 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2022-11-22 00:15:15,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 00:15:15,165 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2022-11-22 00:15:15,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-22 00:15:15,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:15,167 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1] [2022-11-22 00:15:15,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-22 00:15:15,167 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:15,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:15,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1825706635, now seen corresponding path program 2 times [2022-11-22 00:15:15,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:15,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014332814] [2022-11-22 00:15:15,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:15,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:15,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:15,297 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-11-22 00:15:15,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:15,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014332814] [2022-11-22 00:15:15,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014332814] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:15,297 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:15:15,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 00:15:15,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982144480] [2022-11-22 00:15:15,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:15,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:15:15,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:15,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:15:15,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:15,299 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 00:15:15,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:15,340 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2022-11-22 00:15:15,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:15:15,340 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2022-11-22 00:15:15,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:15,342 INFO L225 Difference]: With dead ends: 110 [2022-11-22 00:15:15,342 INFO L226 Difference]: Without dead ends: 109 [2022-11-22 00:15:15,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:15:15,343 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:15,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 51 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:15:15,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-22 00:15:15,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2022-11-22 00:15:15,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-22 00:15:15,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2022-11-22 00:15:15,357 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 69 [2022-11-22 00:15:15,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:15,358 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2022-11-22 00:15:15,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 00:15:15,358 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2022-11-22 00:15:15,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-11-22 00:15:15,363 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:15,363 INFO L195 NwaCegarLoop]: trace histogram [19, 17, 13, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 7, 7, 6, 4, 1, 1, 1] [2022-11-22 00:15:15,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-22 00:15:15,364 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:15,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:15,364 INFO L85 PathProgramCache]: Analyzing trace with hash 2064354679, now seen corresponding path program 2 times [2022-11-22 00:15:15,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:15,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525332386] [2022-11-22 00:15:15,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:15,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:15,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:15,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 59 proven. 270 refuted. 0 times theorem prover too weak. 692 trivial. 0 not checked. [2022-11-22 00:15:15,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:15,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525332386] [2022-11-22 00:15:15,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525332386] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:15,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406184206] [2022-11-22 00:15:15,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:15:15,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:15,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:15,539 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:15,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 00:15:15,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 00:15:15,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:15,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 00:15:15,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:15,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 346 proven. 85 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2022-11-22 00:15:15,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:16,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 346 proven. 88 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2022-11-22 00:15:16,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406184206] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:16,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25060558] [2022-11-22 00:15:16,392 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:16,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:16,393 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:16,394 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:16,394 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 11] total 18 [2022-11-22 00:15:16,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948256661] [2022-11-22 00:15:16,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:16,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 00:15:16,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:16,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 00:15:16,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-11-22 00:15:16,396 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 18 states, 18 states have (on average 5.222222222222222) internal successors, (94), 18 states have internal predecessors, (94), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) [2022-11-22 00:15:16,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:16,800 INFO L93 Difference]: Finished difference Result 174 states and 302 transitions. [2022-11-22 00:15:16,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 00:15:16,801 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.222222222222222) internal successors, (94), 18 states have internal predecessors, (94), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) Word has length 173 [2022-11-22 00:15:16,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:16,802 INFO L225 Difference]: With dead ends: 174 [2022-11-22 00:15:16,803 INFO L226 Difference]: Without dead ends: 79 [2022-11-22 00:15:16,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 335 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2022-11-22 00:15:16,805 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 234 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:16,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 68 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:15:16,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-22 00:15:16,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 71. [2022-11-22 00:15:16,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 54 states have internal predecessors, (61), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (17), 11 states have call predecessors, (17), 7 states have call successors, (17) [2022-11-22 00:15:16,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2022-11-22 00:15:16,816 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 173 [2022-11-22 00:15:16,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:16,816 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2022-11-22 00:15:16,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.222222222222222) internal successors, (94), 18 states have internal predecessors, (94), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) [2022-11-22 00:15:16,817 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2022-11-22 00:15:16,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-22 00:15:16,818 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:16,819 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2022-11-22 00:15:16,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:17,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:17,024 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:17,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:17,024 INFO L85 PathProgramCache]: Analyzing trace with hash 754346100, now seen corresponding path program 3 times [2022-11-22 00:15:17,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:17,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021880441] [2022-11-22 00:15:17,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:17,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:17,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:17,270 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 93 proven. 48 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2022-11-22 00:15:17,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:17,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021880441] [2022-11-22 00:15:17,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021880441] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:17,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959767735] [2022-11-22 00:15:17,271 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:15:17,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:17,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:17,272 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:17,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 00:15:17,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:15:17,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:17,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 00:15:17,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 140 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-22 00:15:17,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:17,960 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 102 proven. 62 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2022-11-22 00:15:17,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959767735] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:17,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167223231] [2022-11-22 00:15:17,963 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:17,963 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:17,964 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:17,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:17,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2022-11-22 00:15:17,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390350690] [2022-11-22 00:15:17,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:17,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 00:15:17,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:17,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 00:15:17,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2022-11-22 00:15:17,970 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-22 00:15:18,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:18,181 INFO L93 Difference]: Finished difference Result 130 states and 160 transitions. [2022-11-22 00:15:18,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:15:18,182 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) Word has length 89 [2022-11-22 00:15:18,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:18,183 INFO L225 Difference]: With dead ends: 130 [2022-11-22 00:15:18,183 INFO L226 Difference]: Without dead ends: 63 [2022-11-22 00:15:18,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 169 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2022-11-22 00:15:18,185 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 94 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:18,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 62 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:18,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-22 00:15:18,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-11-22 00:15:18,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-22 00:15:18,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-11-22 00:15:18,192 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 89 [2022-11-22 00:15:18,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:18,192 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-11-22 00:15:18,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-22 00:15:18,193 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-11-22 00:15:18,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-22 00:15:18,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:18,194 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1] [2022-11-22 00:15:18,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:18,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 00:15:18,399 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:18,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:18,399 INFO L85 PathProgramCache]: Analyzing trace with hash 648250205, now seen corresponding path program 3 times [2022-11-22 00:15:18,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:18,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857066078] [2022-11-22 00:15:18,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:18,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:18,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:18,746 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-11-22 00:15:18,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:18,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857066078] [2022-11-22 00:15:18,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857066078] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:18,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322024284] [2022-11-22 00:15:18,747 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:15:18,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:18,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:18,749 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:18,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 00:15:18,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:15:18,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:18,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 00:15:18,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:18,915 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-22 00:15:18,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:19,123 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-22 00:15:19,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322024284] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:19,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [65835321] [2022-11-22 00:15:19,128 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:19,128 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:19,128 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:19,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:19,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2022-11-22 00:15:19,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296833450] [2022-11-22 00:15:19,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:19,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 00:15:19,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:19,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 00:15:19,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2022-11-22 00:15:19,132 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-22 00:15:19,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:19,247 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2022-11-22 00:15:19,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 00:15:19,248 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) Word has length 83 [2022-11-22 00:15:19,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:19,249 INFO L225 Difference]: With dead ends: 67 [2022-11-22 00:15:19,249 INFO L226 Difference]: Without dead ends: 66 [2022-11-22 00:15:19,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 162 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2022-11-22 00:15:19,250 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 25 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:19,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 124 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:19,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-22 00:15:19,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2022-11-22 00:15:19,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-22 00:15:19,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2022-11-22 00:15:19,257 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 83 [2022-11-22 00:15:19,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:19,257 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2022-11-22 00:15:19,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-22 00:15:19,257 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2022-11-22 00:15:19,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-11-22 00:15:19,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:19,265 INFO L195 NwaCegarLoop]: trace histogram [23, 21, 18, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 9, 7, 5, 1, 1, 1] [2022-11-22 00:15:19,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:19,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 00:15:19,471 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:19,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:19,471 INFO L85 PathProgramCache]: Analyzing trace with hash -218556633, now seen corresponding path program 4 times [2022-11-22 00:15:19,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:19,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217623898] [2022-11-22 00:15:19,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:19,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:19,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:19,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 219 proven. 562 refuted. 0 times theorem prover too weak. 809 trivial. 0 not checked. [2022-11-22 00:15:19,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:19,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217623898] [2022-11-22 00:15:19,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217623898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:19,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506174361] [2022-11-22 00:15:19,924 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:15:19,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:19,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:19,925 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:19,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 00:15:20,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:20,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 00:15:20,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:20,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 619 proven. 533 refuted. 0 times theorem prover too weak. 438 trivial. 0 not checked. [2022-11-22 00:15:20,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:21,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 271 proven. 717 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2022-11-22 00:15:21,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506174361] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:21,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283594160] [2022-11-22 00:15:21,272 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:21,272 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:21,272 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:21,273 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:21,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 18] total 23 [2022-11-22 00:15:21,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737003570] [2022-11-22 00:15:21,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:21,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-22 00:15:21,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:21,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-22 00:15:21,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2022-11-22 00:15:21,276 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2022-11-22 00:15:21,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:21,809 INFO L93 Difference]: Finished difference Result 151 states and 183 transitions. [2022-11-22 00:15:21,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 00:15:21,810 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) Word has length 214 [2022-11-22 00:15:21,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:21,811 INFO L225 Difference]: With dead ends: 151 [2022-11-22 00:15:21,811 INFO L226 Difference]: Without dead ends: 93 [2022-11-22 00:15:21,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 415 SyntacticMatches, 10 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=411, Invalid=1071, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 00:15:21,812 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 318 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:21,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 71 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:15:21,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-22 00:15:21,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 80. [2022-11-22 00:15:21,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 64 states have (on average 1.078125) internal successors, (69), 61 states have internal predecessors, (69), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (17), 10 states have call predecessors, (17), 8 states have call successors, (17) [2022-11-22 00:15:21,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 95 transitions. [2022-11-22 00:15:21,820 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 95 transitions. Word has length 214 [2022-11-22 00:15:21,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:21,820 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 95 transitions. [2022-11-22 00:15:21,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2022-11-22 00:15:21,821 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 95 transitions. [2022-11-22 00:15:21,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-22 00:15:21,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:21,822 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1] [2022-11-22 00:15:21,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:22,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:22,036 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:22,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:22,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1713916628, now seen corresponding path program 5 times [2022-11-22 00:15:22,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:22,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882465077] [2022-11-22 00:15:22,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:22,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:22,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:22,372 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 164 proven. 168 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-22 00:15:22,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:22,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882465077] [2022-11-22 00:15:22,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882465077] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:22,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087815699] [2022-11-22 00:15:22,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:15:22,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:22,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:22,375 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:22,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 00:15:22,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 00:15:22,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:22,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-22 00:15:22,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:22,758 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 61 proven. 90 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2022-11-22 00:15:22,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:23,998 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 103 proven. 90 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2022-11-22 00:15:23,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087815699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:23,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625714338] [2022-11-22 00:15:24,001 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:24,001 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:24,001 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:24,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:24,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15] total 35 [2022-11-22 00:15:24,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483461445] [2022-11-22 00:15:24,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:24,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 00:15:24,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:24,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 00:15:24,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 00:15:24,005 INFO L87 Difference]: Start difference. First operand 80 states and 95 transitions. Second operand has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2022-11-22 00:15:25,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:25,164 INFO L93 Difference]: Finished difference Result 188 states and 251 transitions. [2022-11-22 00:15:25,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 00:15:25,165 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) Word has length 127 [2022-11-22 00:15:25,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:25,166 INFO L225 Difference]: With dead ends: 188 [2022-11-22 00:15:25,166 INFO L226 Difference]: Without dead ends: 112 [2022-11-22 00:15:25,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 227 SyntacticMatches, 10 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=662, Invalid=3120, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 00:15:25,169 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 243 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:25,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 75 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:15:25,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-22 00:15:25,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 92. [2022-11-22 00:15:25,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 71 states have internal predecessors, (76), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (25), 12 states have call predecessors, (25), 10 states have call successors, (25) [2022-11-22 00:15:25,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 112 transitions. [2022-11-22 00:15:25,180 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 112 transitions. Word has length 127 [2022-11-22 00:15:25,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:25,180 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 112 transitions. [2022-11-22 00:15:25,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2022-11-22 00:15:25,181 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 112 transitions. [2022-11-22 00:15:25,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2022-11-22 00:15:25,190 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:25,190 INFO L195 NwaCegarLoop]: trace histogram [47, 45, 38, 23, 23, 23, 23, 23, 23, 23, 23, 23, 22, 22, 21, 21, 15, 9, 1, 1, 1] [2022-11-22 00:15:25,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:25,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 00:15:25,401 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:25,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:25,402 INFO L85 PathProgramCache]: Analyzing trace with hash 1302342911, now seen corresponding path program 6 times [2022-11-22 00:15:25,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:25,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621023587] [2022-11-22 00:15:25,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:25,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:25,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:26,357 INFO L134 CoverageAnalysis]: Checked inductivity of 7288 backedges. 537 proven. 2001 refuted. 0 times theorem prover too weak. 4750 trivial. 0 not checked. [2022-11-22 00:15:26,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:26,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621023587] [2022-11-22 00:15:26,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621023587] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:26,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932193654] [2022-11-22 00:15:26,358 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:15:26,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:26,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:26,363 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:26,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 00:15:26,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:15:26,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:26,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 00:15:26,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:26,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7288 backedges. 3845 proven. 1245 refuted. 0 times theorem prover too weak. 2198 trivial. 0 not checked. [2022-11-22 00:15:26,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:28,530 INFO L134 CoverageAnalysis]: Checked inductivity of 7288 backedges. 637 proven. 2493 refuted. 0 times theorem prover too weak. 4158 trivial. 0 not checked. [2022-11-22 00:15:28,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932193654] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:28,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1128627853] [2022-11-22 00:15:28,533 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:28,533 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:28,534 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:28,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:28,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 22] total 27 [2022-11-22 00:15:28,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147396739] [2022-11-22 00:15:28,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:28,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 00:15:28,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:28,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 00:15:28,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2022-11-22 00:15:28,540 INFO L87 Difference]: Start difference. First operand 92 states and 112 transitions. Second operand has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-22 00:15:29,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:29,247 INFO L93 Difference]: Finished difference Result 222 states and 291 transitions. [2022-11-22 00:15:29,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 00:15:29,250 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 450 [2022-11-22 00:15:29,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:29,251 INFO L225 Difference]: With dead ends: 222 [2022-11-22 00:15:29,251 INFO L226 Difference]: Without dead ends: 134 [2022-11-22 00:15:29,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 885 SyntacticMatches, 12 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=589, Invalid=1667, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 00:15:29,253 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 476 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:29,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [476 Valid, 95 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:15:29,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-11-22 00:15:29,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 118. [2022-11-22 00:15:29,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 95 states have (on average 1.0526315789473684) internal successors, (100), 91 states have internal predecessors, (100), 14 states have call successors, (14), 11 states have call predecessors, (14), 8 states have return successors, (32), 15 states have call predecessors, (32), 13 states have call successors, (32) [2022-11-22 00:15:29,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 146 transitions. [2022-11-22 00:15:29,273 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 146 transitions. Word has length 450 [2022-11-22 00:15:29,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:29,274 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 146 transitions. [2022-11-22 00:15:29,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-22 00:15:29,274 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 146 transitions. [2022-11-22 00:15:29,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2022-11-22 00:15:29,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:29,280 INFO L195 NwaCegarLoop]: trace histogram [32, 30, 26, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1] [2022-11-22 00:15:29,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:29,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 00:15:29,486 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:29,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:29,486 INFO L85 PathProgramCache]: Analyzing trace with hash 2133139123, now seen corresponding path program 7 times [2022-11-22 00:15:29,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:29,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184487407] [2022-11-22 00:15:29,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:29,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:29,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:30,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 541 proven. 990 refuted. 0 times theorem prover too weak. 1737 trivial. 0 not checked. [2022-11-22 00:15:30,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:30,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184487407] [2022-11-22 00:15:30,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184487407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:30,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235296531] [2022-11-22 00:15:30,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:15:30,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:30,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:30,065 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:30,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 00:15:30,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:30,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 588 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 00:15:30,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:30,397 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 1849 proven. 484 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2022-11-22 00:15:30,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:32,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 538 proven. 1101 refuted. 0 times theorem prover too weak. 1629 trivial. 0 not checked. [2022-11-22 00:15:32,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235296531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:32,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213554920] [2022-11-22 00:15:32,063 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:32,063 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:32,064 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:32,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:32,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 19] total 24 [2022-11-22 00:15:32,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139035618] [2022-11-22 00:15:32,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:32,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 00:15:32,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:32,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 00:15:32,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-11-22 00:15:32,068 INFO L87 Difference]: Start difference. First operand 118 states and 146 transitions. Second operand has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2022-11-22 00:15:32,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:32,483 INFO L93 Difference]: Finished difference Result 230 states and 295 transitions. [2022-11-22 00:15:32,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 00:15:32,483 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) Word has length 304 [2022-11-22 00:15:32,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:32,485 INFO L225 Difference]: With dead ends: 230 [2022-11-22 00:15:32,485 INFO L226 Difference]: Without dead ends: 116 [2022-11-22 00:15:32,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 595 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 00:15:32,487 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 188 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:32,487 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 109 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:15:32,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-22 00:15:32,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 104. [2022-11-22 00:15:32,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 83 states have (on average 1.036144578313253) internal successors, (86), 81 states have internal predecessors, (86), 13 states have call successors, (13), 10 states have call predecessors, (13), 7 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2022-11-22 00:15:32,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2022-11-22 00:15:32,494 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 304 [2022-11-22 00:15:32,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:32,495 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2022-11-22 00:15:32,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2022-11-22 00:15:32,495 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2022-11-22 00:15:32,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2022-11-22 00:15:32,498 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:32,499 INFO L195 NwaCegarLoop]: trace histogram [52, 50, 42, 26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 25, 24, 24, 16, 10, 1, 1, 1] [2022-11-22 00:15:32,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:32,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 00:15:32,711 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:32,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:32,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1057290307, now seen corresponding path program 8 times [2022-11-22 00:15:32,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:32,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60106009] [2022-11-22 00:15:32,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:32,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:32,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:33,852 INFO L134 CoverageAnalysis]: Checked inductivity of 9014 backedges. 1101 proven. 2452 refuted. 0 times theorem prover too weak. 5461 trivial. 0 not checked. [2022-11-22 00:15:33,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:33,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60106009] [2022-11-22 00:15:33,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60106009] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:33,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356979787] [2022-11-22 00:15:33,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:15:33,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:33,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:33,855 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:33,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 00:15:34,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-11-22 00:15:34,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:34,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 00:15:34,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:34,269 INFO L134 CoverageAnalysis]: Checked inductivity of 9014 backedges. 1747 proven. 1024 refuted. 0 times theorem prover too weak. 6243 trivial. 0 not checked. [2022-11-22 00:15:34,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:35,834 INFO L134 CoverageAnalysis]: Checked inductivity of 9014 backedges. 1755 proven. 1063 refuted. 0 times theorem prover too weak. 6196 trivial. 0 not checked. [2022-11-22 00:15:35,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356979787] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:35,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044520221] [2022-11-22 00:15:35,836 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:35,836 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:35,836 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:35,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:35,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 19] total 27 [2022-11-22 00:15:35,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297824773] [2022-11-22 00:15:35,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:35,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 00:15:35,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:35,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 00:15:35,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=574, Unknown=0, NotChecked=0, Total=702 [2022-11-22 00:15:35,840 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) [2022-11-22 00:15:36,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:36,689 INFO L93 Difference]: Finished difference Result 258 states and 336 transitions. [2022-11-22 00:15:36,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 00:15:36,690 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) Word has length 500 [2022-11-22 00:15:36,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:36,696 INFO L225 Difference]: With dead ends: 258 [2022-11-22 00:15:36,697 INFO L226 Difference]: Without dead ends: 158 [2022-11-22 00:15:36,702 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 992 SyntacticMatches, 9 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=682, Invalid=2074, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 00:15:36,703 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 308 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:36,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [308 Valid, 129 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 00:15:36,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-22 00:15:36,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 134. [2022-11-22 00:15:36,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 105 states have internal predecessors, (113), 17 states have call successors, (17), 14 states have call predecessors, (17), 8 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) [2022-11-22 00:15:36,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 168 transitions. [2022-11-22 00:15:36,723 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 168 transitions. Word has length 500 [2022-11-22 00:15:36,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:36,726 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 168 transitions. [2022-11-22 00:15:36,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) [2022-11-22 00:15:36,727 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 168 transitions. [2022-11-22 00:15:36,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2022-11-22 00:15:36,730 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:36,730 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 28, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 16, 16, 11, 7, 1, 1, 1] [2022-11-22 00:15:36,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:36,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 00:15:36,937 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:36,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:36,937 INFO L85 PathProgramCache]: Analyzing trace with hash 58791316, now seen corresponding path program 9 times [2022-11-22 00:15:36,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:36,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667010175] [2022-11-22 00:15:36,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:36,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:36,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 727 proven. 1095 refuted. 0 times theorem prover too weak. 2212 trivial. 0 not checked. [2022-11-22 00:15:37,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:37,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667010175] [2022-11-22 00:15:37,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667010175] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:37,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311310441] [2022-11-22 00:15:37,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:15:37,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:37,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:37,470 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:37,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 00:15:37,689 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:15:37,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:37,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 00:15:37,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:37,899 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 840 proven. 1214 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-11-22 00:15:37,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:39,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 840 proven. 1290 refuted. 0 times theorem prover too weak. 1904 trivial. 0 not checked. [2022-11-22 00:15:39,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311310441] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:39,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [487687957] [2022-11-22 00:15:39,863 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:39,863 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:39,863 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:39,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:39,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2022-11-22 00:15:39,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251585836] [2022-11-22 00:15:39,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:39,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 00:15:39,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:39,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 00:15:39,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2022-11-22 00:15:39,867 INFO L87 Difference]: Start difference. First operand 134 states and 168 transitions. Second operand has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-22 00:15:40,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:40,518 INFO L93 Difference]: Finished difference Result 277 states and 362 transitions. [2022-11-22 00:15:40,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 00:15:40,523 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 337 [2022-11-22 00:15:40,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:40,525 INFO L225 Difference]: With dead ends: 277 [2022-11-22 00:15:40,525 INFO L226 Difference]: Without dead ends: 147 [2022-11-22 00:15:40,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 657 SyntacticMatches, 11 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 00:15:40,527 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 238 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:40,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 203 Invalid, 778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 00:15:40,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-11-22 00:15:40,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 123. [2022-11-22 00:15:40,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 98 states have (on average 1.030612244897959) internal successors, (101), 97 states have internal predecessors, (101), 16 states have call successors, (16), 12 states have call predecessors, (16), 8 states have return successors, (35), 13 states have call predecessors, (35), 15 states have call successors, (35) [2022-11-22 00:15:40,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 152 transitions. [2022-11-22 00:15:40,556 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 152 transitions. Word has length 337 [2022-11-22 00:15:40,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:40,557 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 152 transitions. [2022-11-22 00:15:40,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-22 00:15:40,558 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 152 transitions. [2022-11-22 00:15:40,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2022-11-22 00:15:40,560 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:40,560 INFO L195 NwaCegarLoop]: trace histogram [42, 40, 34, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1] [2022-11-22 00:15:40,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:40,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 00:15:40,766 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:40,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:40,766 INFO L85 PathProgramCache]: Analyzing trace with hash -515709298, now seen corresponding path program 10 times [2022-11-22 00:15:40,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:40,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051141435] [2022-11-22 00:15:40,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:40,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:40,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:43,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3503 trivial. 0 not checked. [2022-11-22 00:15:43,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:43,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051141435] [2022-11-22 00:15:43,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051141435] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:43,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684519393] [2022-11-22 00:15:43,487 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:15:43,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:43,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:43,488 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:43,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 00:15:43,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:43,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-22 00:15:43,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:44,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3871 trivial. 0 not checked. [2022-11-22 00:15:44,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:51,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3639 trivial. 0 not checked. [2022-11-22 00:15:51,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684519393] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:51,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714641059] [2022-11-22 00:15:51,500 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:15:51,500 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:51,500 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:15:51,501 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:15:51,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2022-11-22 00:15:51,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864856608] [2022-11-22 00:15:51,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:51,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 00:15:51,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:51,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 00:15:51,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 00:15:51,504 INFO L87 Difference]: Start difference. First operand 123 states and 152 transitions. Second operand has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-22 00:15:51,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:51,755 INFO L93 Difference]: Finished difference Result 154 states and 204 transitions. [2022-11-22 00:15:51,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 00:15:51,755 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 402 [2022-11-22 00:15:51,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:51,757 INFO L225 Difference]: With dead ends: 154 [2022-11-22 00:15:51,758 INFO L226 Difference]: Without dead ends: 153 [2022-11-22 00:15:51,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 788 SyntacticMatches, 51 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2454 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 00:15:51,759 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 77 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:51,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 134 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:15:51,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-22 00:15:51,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 143. [2022-11-22 00:15:51,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 112 states have internal predecessors, (117), 18 states have call successors, (18), 12 states have call predecessors, (18), 10 states have return successors, (55), 18 states have call predecessors, (55), 17 states have call successors, (55) [2022-11-22 00:15:51,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 190 transitions. [2022-11-22 00:15:51,779 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 190 transitions. Word has length 402 [2022-11-22 00:15:51,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:51,780 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 190 transitions. [2022-11-22 00:15:51,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-22 00:15:51,781 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 190 transitions. [2022-11-22 00:15:51,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1228 [2022-11-22 00:15:51,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:51,794 INFO L195 NwaCegarLoop]: trace histogram [127, 123, 103, 64, 64, 64, 64, 62, 62, 62, 62, 62, 61, 61, 60, 60, 39, 24, 1, 1, 1] [2022-11-22 00:15:51,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:52,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:52,000 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:15:52,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:52,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1667091904, now seen corresponding path program 11 times [2022-11-22 00:15:52,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:52,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737667902] [2022-11-22 00:15:52,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:52,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:52,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:54,258 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 2271 proven. 8825 refuted. 0 times theorem prover too weak. 44207 trivial. 0 not checked. [2022-11-22 00:15:54,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:54,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737667902] [2022-11-22 00:15:54,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737667902] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:15:54,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773945097] [2022-11-22 00:15:54,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:15:54,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:54,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:54,261 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:54,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 00:15:54,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-11-22 00:15:54,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:15:54,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 165 conjunts are in the unsatisfiable core [2022-11-22 00:15:55,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:56,226 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 16340 proven. 4556 refuted. 0 times theorem prover too weak. 34407 trivial. 0 not checked. [2022-11-22 00:15:56,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:21,589 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 17207 proven. 4221 refuted. 0 times theorem prover too weak. 33875 trivial. 0 not checked. [2022-11-22 00:16:21,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773945097] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:21,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744692966] [2022-11-22 00:16:21,591 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:16:21,592 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:21,592 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:16:21,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:16:21,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 38] total 65 [2022-11-22 00:16:21,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612896006] [2022-11-22 00:16:21,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:21,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-22 00:16:21,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:21,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-22 00:16:21,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=3618, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 00:16:21,599 INFO L87 Difference]: Start difference. First operand 143 states and 190 transitions. Second operand has 65 states, 65 states have (on average 3.4307692307692306) internal successors, (223), 65 states have internal predecessors, (223), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2022-11-22 00:16:24,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:24,619 INFO L93 Difference]: Finished difference Result 394 states and 604 transitions. [2022-11-22 00:16:24,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-22 00:16:24,620 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.4307692307692306) internal successors, (223), 65 states have internal predecessors, (223), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) Word has length 1227 [2022-11-22 00:16:24,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:24,623 INFO L225 Difference]: With dead ends: 394 [2022-11-22 00:16:24,623 INFO L226 Difference]: Without dead ends: 255 [2022-11-22 00:16:24,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2555 GetRequests, 2314 SyntacticMatches, 109 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9128 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2535, Invalid=15287, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 00:16:24,630 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 564 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 1001 mSolverCounterSat, 290 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 1291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 290 IncrementalHoareTripleChecker+Valid, 1001 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:24,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 121 Invalid, 1291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [290 Valid, 1001 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 00:16:24,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-11-22 00:16:24,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 217. [2022-11-22 00:16:24,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 174 states have (on average 1.028735632183908) internal successors, (179), 170 states have internal predecessors, (179), 27 states have call successors, (27), 17 states have call predecessors, (27), 15 states have return successors, (108), 29 states have call predecessors, (108), 26 states have call successors, (108) [2022-11-22 00:16:24,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 314 transitions. [2022-11-22 00:16:24,649 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 314 transitions. Word has length 1227 [2022-11-22 00:16:24,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:24,650 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 314 transitions. [2022-11-22 00:16:24,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.4307692307692306) internal successors, (223), 65 states have internal predecessors, (223), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2022-11-22 00:16:24,651 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 314 transitions. [2022-11-22 00:16:24,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1123 [2022-11-22 00:16:24,664 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:24,664 INFO L195 NwaCegarLoop]: trace histogram [115, 114, 93, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 56, 56, 36, 22, 1, 1, 1] [2022-11-22 00:16:24,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 00:16:24,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2022-11-22 00:16:24,872 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:16:24,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:24,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1136425118, now seen corresponding path program 12 times [2022-11-22 00:16:24,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:24,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071638457] [2022-11-22 00:16:24,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:24,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:25,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 5612 proven. 2561 refuted. 0 times theorem prover too weak. 38001 trivial. 0 not checked. [2022-11-22 00:16:26,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:16:26,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071638457] [2022-11-22 00:16:26,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071638457] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:16:26,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248673036] [2022-11-22 00:16:26,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:16:26,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:26,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:16:26,660 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:16:26,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 00:16:27,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:16:27,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:16:27,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 1394 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 00:16:27,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:16:27,673 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 25253 proven. 2667 refuted. 0 times theorem prover too weak. 18254 trivial. 0 not checked. [2022-11-22 00:16:27,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:33,537 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 3245 proven. 8582 refuted. 0 times theorem prover too weak. 34347 trivial. 0 not checked. [2022-11-22 00:16:33,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248673036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:33,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2052430527] [2022-11-22 00:16:33,540 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:16:33,540 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:33,541 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:16:33,542 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:16:33,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 32 [2022-11-22 00:16:33,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806245154] [2022-11-22 00:16:33,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:33,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 00:16:33,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:33,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 00:16:33,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:16:33,546 INFO L87 Difference]: Start difference. First operand 217 states and 314 transitions. Second operand has 32 states, 32 states have (on average 5.84375) internal successors, (187), 32 states have internal predecessors, (187), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2022-11-22 00:16:34,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:34,385 INFO L93 Difference]: Finished difference Result 413 states and 634 transitions. [2022-11-22 00:16:34,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 00:16:34,386 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.84375) internal successors, (187), 32 states have internal predecessors, (187), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) Word has length 1122 [2022-11-22 00:16:34,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:34,389 INFO L225 Difference]: With dead ends: 413 [2022-11-22 00:16:34,389 INFO L226 Difference]: Without dead ends: 200 [2022-11-22 00:16:34,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2284 GetRequests, 2223 SyntacticMatches, 13 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 00:16:34,393 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 333 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 657 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 657 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:34,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 206 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 657 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:16:34,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-11-22 00:16:34,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 164. [2022-11-22 00:16:34,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 129 states have internal predecessors, (134), 21 states have call successors, (21), 14 states have call predecessors, (21), 11 states have return successors, (67), 20 states have call predecessors, (67), 20 states have call successors, (67) [2022-11-22 00:16:34,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 222 transitions. [2022-11-22 00:16:34,415 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 222 transitions. Word has length 1122 [2022-11-22 00:16:34,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:34,416 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 222 transitions. [2022-11-22 00:16:34,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.84375) internal successors, (187), 32 states have internal predecessors, (187), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2022-11-22 00:16:34,416 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 222 transitions. [2022-11-22 00:16:34,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1325 [2022-11-22 00:16:34,433 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:34,433 INFO L195 NwaCegarLoop]: trace histogram [136, 134, 110, 68, 68, 68, 68, 67, 67, 67, 67, 67, 67, 67, 66, 66, 42, 26, 1, 1, 1] [2022-11-22 00:16:34,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 00:16:34,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-22 00:16:34,648 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:16:34,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:34,648 INFO L85 PathProgramCache]: Analyzing trace with hash -548432923, now seen corresponding path program 13 times [2022-11-22 00:16:34,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:34,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941723063] [2022-11-22 00:16:34,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:34,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:34,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:37,565 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 4508 proven. 10243 refuted. 0 times theorem prover too weak. 49671 trivial. 0 not checked. [2022-11-22 00:16:37,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:16:37,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941723063] [2022-11-22 00:16:37,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941723063] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:16:37,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303498946] [2022-11-22 00:16:37,567 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:16:37,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:37,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:16:37,568 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:16:37,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 00:16:38,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:38,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 2472 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 00:16:38,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:16:38,785 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 5217 proven. 10902 refuted. 0 times theorem prover too weak. 48303 trivial. 0 not checked. [2022-11-22 00:16:38,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:44,750 INFO L134 CoverageAnalysis]: Checked inductivity of 64422 backedges. 5217 proven. 11133 refuted. 0 times theorem prover too weak. 48072 trivial. 0 not checked. [2022-11-22 00:16:44,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303498946] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:44,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830251229] [2022-11-22 00:16:44,753 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:16:44,753 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:44,753 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:16:44,753 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:16:44,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2022-11-22 00:16:44,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051191744] [2022-11-22 00:16:44,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:44,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 00:16:44,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:44,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 00:16:44,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1309, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 00:16:44,758 INFO L87 Difference]: Start difference. First operand 164 states and 222 transitions. Second operand has 40 states, 40 states have (on average 5.475) internal successors, (219), 40 states have internal predecessors, (219), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2022-11-22 00:16:46,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:46,170 INFO L93 Difference]: Finished difference Result 381 states and 569 transitions. [2022-11-22 00:16:46,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-22 00:16:46,172 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.475) internal successors, (219), 40 states have internal predecessors, (219), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) Word has length 1324 [2022-11-22 00:16:46,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:46,176 INFO L225 Difference]: With dead ends: 381 [2022-11-22 00:16:46,176 INFO L226 Difference]: Without dead ends: 221 [2022-11-22 00:16:46,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2718 GetRequests, 2627 SyntacticMatches, 17 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1492 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1360, Invalid=4340, Unknown=0, NotChecked=0, Total=5700 [2022-11-22 00:16:46,180 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 698 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 698 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 1435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:46,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [698 Valid, 200 Invalid, 1435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 00:16:46,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-22 00:16:46,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 208. [2022-11-22 00:16:46,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 168 states have (on average 1.0297619047619047) internal successors, (173), 164 states have internal predecessors, (173), 27 states have call successors, (27), 20 states have call predecessors, (27), 12 states have return successors, (79), 23 states have call predecessors, (79), 26 states have call successors, (79) [2022-11-22 00:16:46,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 279 transitions. [2022-11-22 00:16:46,197 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 279 transitions. Word has length 1324 [2022-11-22 00:16:46,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:46,198 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 279 transitions. [2022-11-22 00:16:46,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.475) internal successors, (219), 40 states have internal predecessors, (219), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2022-11-22 00:16:46,199 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 279 transitions. [2022-11-22 00:16:46,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1580 [2022-11-22 00:16:46,220 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:46,220 INFO L195 NwaCegarLoop]: trace histogram [162, 160, 131, 81, 81, 81, 81, 80, 80, 80, 80, 80, 80, 80, 79, 79, 50, 31, 1, 1, 1] [2022-11-22 00:16:46,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 00:16:46,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:46,431 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:16:46,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:46,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1073858072, now seen corresponding path program 14 times [2022-11-22 00:16:46,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:46,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090619233] [2022-11-22 00:16:46,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:46,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:46,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:49,481 INFO L134 CoverageAnalysis]: Checked inductivity of 91798 backedges. 6277 proven. 12368 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2022-11-22 00:16:49,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:16:49,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090619233] [2022-11-22 00:16:49,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090619233] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:16:49,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633589831] [2022-11-22 00:16:49,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:16:49,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:49,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:16:49,482 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:16:49,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 00:16:50,506 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2022-11-22 00:16:50,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:16:50,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 1536 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 00:16:50,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:16:50,925 INFO L134 CoverageAnalysis]: Checked inductivity of 91798 backedges. 6339 proven. 9130 refuted. 0 times theorem prover too weak. 76329 trivial. 0 not checked. [2022-11-22 00:16:50,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:56,465 INFO L134 CoverageAnalysis]: Checked inductivity of 91798 backedges. 6332 proven. 9282 refuted. 0 times theorem prover too weak. 76184 trivial. 0 not checked. [2022-11-22 00:16:56,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633589831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:56,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871744301] [2022-11-22 00:16:56,468 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:16:56,468 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:56,468 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:16:56,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:16:56,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 28] total 36 [2022-11-22 00:16:56,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914005760] [2022-11-22 00:16:56,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:56,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 00:16:56,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:56,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 00:16:56,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 00:16:56,474 INFO L87 Difference]: Start difference. First operand 208 states and 279 transitions. Second operand has 36 states, 36 states have (on average 6.083333333333333) internal successors, (219), 36 states have internal predecessors, (219), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) [2022-11-22 00:16:57,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:57,708 INFO L93 Difference]: Finished difference Result 434 states and 615 transitions. [2022-11-22 00:16:57,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 00:16:57,709 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 6.083333333333333) internal successors, (219), 36 states have internal predecessors, (219), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) Word has length 1579 [2022-11-22 00:16:57,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:57,713 INFO L225 Difference]: With dead ends: 434 [2022-11-22 00:16:57,713 INFO L226 Difference]: Without dead ends: 230 [2022-11-22 00:16:57,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3212 GetRequests, 3141 SyntacticMatches, 13 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=852, Invalid=2688, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 00:16:57,716 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 613 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 986 mSolverCounterSat, 476 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 613 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 1462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 476 IncrementalHoareTripleChecker+Valid, 986 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:57,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [613 Valid, 308 Invalid, 1462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [476 Valid, 986 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 00:16:57,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-11-22 00:16:57,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 173. [2022-11-22 00:16:57,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 139 states have (on average 1.0215827338129497) internal successors, (142), 137 states have internal predecessors, (142), 23 states have call successors, (23), 17 states have call predecessors, (23), 10 states have return successors, (58), 18 states have call predecessors, (58), 22 states have call successors, (58) [2022-11-22 00:16:57,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 223 transitions. [2022-11-22 00:16:57,731 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 223 transitions. Word has length 1579 [2022-11-22 00:16:57,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:57,732 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 223 transitions. [2022-11-22 00:16:57,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 6.083333333333333) internal successors, (219), 36 states have internal predecessors, (219), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) [2022-11-22 00:16:57,732 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 223 transitions. [2022-11-22 00:16:57,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1737 [2022-11-22 00:16:57,757 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:57,758 INFO L195 NwaCegarLoop]: trace histogram [178, 176, 144, 89, 89, 89, 89, 88, 88, 88, 88, 88, 88, 88, 87, 87, 55, 34, 1, 1, 1] [2022-11-22 00:16:57,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 00:16:57,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:57,968 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:16:57,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:57,969 INFO L85 PathProgramCache]: Analyzing trace with hash 1566087372, now seen corresponding path program 15 times [2022-11-22 00:16:57,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:57,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313061338] [2022-11-22 00:16:57,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:57,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:58,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:17:55,071 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18642 proven. 26756 refuted. 0 times theorem prover too weak. 65661 trivial. 0 not checked. [2022-11-22 00:17:55,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:17:55,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313061338] [2022-11-22 00:17:55,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313061338] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:17:55,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58791835] [2022-11-22 00:17:55,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:17:55,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:55,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:17:55,078 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:17:55,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 00:17:56,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:17:56,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:17:56,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 3233 conjuncts, 353 conjunts are in the unsatisfiable core [2022-11-22 00:17:56,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:17:58,290 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18335 proven. 20467 refuted. 0 times theorem prover too weak. 72257 trivial. 0 not checked. [2022-11-22 00:17:58,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:19:53,758 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 20425 proven. 19582 refuted. 0 times theorem prover too weak. 71052 trivial. 0 not checked. [2022-11-22 00:19:53,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58791835] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:19:53,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521092680] [2022-11-22 00:19:53,761 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:19:53,761 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:19:53,762 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:19:53,763 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:19:53,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 47] total 66 [2022-11-22 00:19:53,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867260010] [2022-11-22 00:19:53,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:19:53,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-22 00:19:53,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:19:53,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-22 00:19:53,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=3470, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 00:19:53,768 INFO L87 Difference]: Start difference. First operand 173 states and 223 transitions. Second operand has 67 states, 66 states have (on average 2.5) internal successors, (165), 67 states have internal predecessors, (165), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2022-11-22 00:19:54,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:19:54,190 INFO L93 Difference]: Finished difference Result 220 states and 311 transitions. [2022-11-22 00:19:54,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 00:19:54,191 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.5) internal successors, (165), 67 states have internal predecessors, (165), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) Word has length 1736 [2022-11-22 00:19:54,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:19:54,196 INFO L225 Difference]: With dead ends: 220 [2022-11-22 00:19:54,196 INFO L226 Difference]: Without dead ends: 219 [2022-11-22 00:19:54,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3829 GetRequests, 3486 SyntacticMatches, 272 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13306 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1125, Invalid=4131, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 00:19:54,198 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 118 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:19:54,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 212 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:19:54,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-11-22 00:19:54,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 200. [2022-11-22 00:19:54,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 160 states have (on average 1.01875) internal successors, (163), 158 states have internal predecessors, (163), 26 states have call successors, (26), 17 states have call predecessors, (26), 13 states have return successors, (97), 24 states have call predecessors, (97), 25 states have call successors, (97) [2022-11-22 00:19:54,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 286 transitions. [2022-11-22 00:19:54,218 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 286 transitions. Word has length 1736 [2022-11-22 00:19:54,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:19:54,220 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 286 transitions. [2022-11-22 00:19:54,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.5) internal successors, (165), 67 states have internal predecessors, (165), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2022-11-22 00:19:54,221 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 286 transitions. [2022-11-22 00:19:54,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4975 [2022-11-22 00:19:54,398 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:19:54,399 INFO L195 NwaCegarLoop]: trace histogram [509, 505, 412, 255, 255, 255, 255, 253, 253, 253, 253, 253, 252, 252, 251, 251, 157, 97, 1, 1, 1] [2022-11-22 00:19:54,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 00:19:54,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:54,612 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:19:54,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:19:54,613 INFO L85 PathProgramCache]: Analyzing trace with hash -868574799, now seen corresponding path program 16 times [2022-11-22 00:19:54,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:19:54,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435163036] [2022-11-22 00:19:54,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:19:54,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:19:55,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:20:16,259 INFO L134 CoverageAnalysis]: Checked inductivity of 917052 backedges. 8549 proven. 56507 refuted. 0 times theorem prover too weak. 851996 trivial. 0 not checked. [2022-11-22 00:20:16,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:20:16,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435163036] [2022-11-22 00:20:16,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1435163036] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:20:16,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517444167] [2022-11-22 00:20:16,260 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:20:16,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:20:16,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:20:16,261 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:20:16,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 00:20:19,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:20:19,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 9213 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 00:20:19,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:20:19,704 INFO L134 CoverageAnalysis]: Checked inductivity of 917052 backedges. 460967 proven. 20720 refuted. 0 times theorem prover too weak. 435365 trivial. 0 not checked. [2022-11-22 00:20:19,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:20:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 917052 backedges. 10205 proven. 63509 refuted. 0 times theorem prover too weak. 843338 trivial. 0 not checked. [2022-11-22 00:20:31,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517444167] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:20:31,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324608205] [2022-11-22 00:20:31,546 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:20:31,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:20:31,547 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-22 00:20:31,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 00:20:31,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 37] total 42 [2022-11-22 00:20:31,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184863112] [2022-11-22 00:20:31,550 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 00:20:31,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-22 00:20:31,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:20:31,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-22 00:20:31,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 00:20:31,554 INFO L87 Difference]: Start difference. First operand 200 states and 286 transitions. Second operand has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2022-11-22 00:20:33,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:20:33,367 INFO L93 Difference]: Finished difference Result 491 states and 771 transitions. [2022-11-22 00:20:33,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-22 00:20:33,368 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) Word has length 4974 [2022-11-22 00:20:33,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:20:33,372 INFO L225 Difference]: With dead ends: 491 [2022-11-22 00:20:33,373 INFO L226 Difference]: Without dead ends: 295 [2022-11-22 00:20:33,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10038 GetRequests, 9924 SyntacticMatches, 21 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2426 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2082, Invalid=6848, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 00:20:33,376 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 1255 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 823 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1255 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 1516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 823 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 00:20:33,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1255 Valid, 202 Invalid, 1516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [823 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 00:20:33,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2022-11-22 00:20:33,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 206. [2022-11-22 00:20:33,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 165 states have (on average 1.018181818181818) internal successors, (168), 163 states have internal predecessors, (168), 27 states have call successors, (27), 18 states have call predecessors, (27), 13 states have return successors, (94), 24 states have call predecessors, (94), 26 states have call successors, (94) [2022-11-22 00:20:33,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 289 transitions. [2022-11-22 00:20:33,395 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 289 transitions. Word has length 4974 [2022-11-22 00:20:33,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:20:33,397 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 289 transitions. [2022-11-22 00:20:33,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2022-11-22 00:20:33,398 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 289 transitions. [2022-11-22 00:20:33,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5230 [2022-11-22 00:20:33,558 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:20:33,559 INFO L195 NwaCegarLoop]: trace histogram [535, 531, 433, 268, 268, 268, 268, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1] [2022-11-22 00:20:33,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 00:20:33,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-22 00:20:33,760 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-22 00:20:33,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:20:33,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1975657880, now seen corresponding path program 17 times [2022-11-22 00:20:33,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:20:33,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519236101] [2022-11-22 00:20:33,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:20:33,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:20:34,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:21:02,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1013638 backedges. 14730 proven. 60403 refuted. 0 times theorem prover too weak. 938505 trivial. 0 not checked. [2022-11-22 00:21:02,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:21:02,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519236101] [2022-11-22 00:21:02,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519236101] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:21:02,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149775644] [2022-11-22 00:21:02,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:21:02,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:21:02,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:21:02,049 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:21:02,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0afa20d-7481-4b76-8d66-c748d1faa61d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 00:21:07,990 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 274 check-sat command(s) [2022-11-22 00:21:07,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:21:08,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 6850 conjuncts, 709 conjunts are in the unsatisfiable core [2022-11-22 00:21:08,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:21:12,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1013638 backedges. 311231 proven. 81757 refuted. 0 times theorem prover too weak. 620650 trivial. 0 not checked. [2022-11-22 00:21:12,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:21:50,495 WARN L233 SmtUtils]: Spent 6.05s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:21:56,471 WARN L233 SmtUtils]: Spent 5.95s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:22:02,569 WARN L233 SmtUtils]: Spent 6.07s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:22:08,557 WARN L233 SmtUtils]: Spent 5.96s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:26:12,471 WARN L233 SmtUtils]: Spent 6.06s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:26:18,598 WARN L233 SmtUtils]: Spent 6.10s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:26:24,793 WARN L233 SmtUtils]: Spent 6.17s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-11-22 00:26:31,093 WARN L233 SmtUtils]: Spent 6.27s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)