./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0 --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 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 --- 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-e04fb08 [2022-11-16 20:08:17,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:08:17,094 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:08:17,117 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:08:17,117 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:08:17,119 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:08:17,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:08:17,122 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:08:17,123 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:08:17,124 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:08:17,125 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:08:17,127 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:08:17,127 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:08:17,128 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:08:17,130 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:08:17,131 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:08:17,132 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:08:17,133 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:08:17,134 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:08:17,136 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:08:17,138 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:08:17,141 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:08:17,142 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:08:17,143 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:08:17,147 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:08:17,147 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:08:17,148 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:08:17,149 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:08:17,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:08:17,150 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:08:17,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:08:17,152 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:08:17,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:08:17,153 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:08:17,155 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:08:17,163 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:08:17,164 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:08:17,164 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:08:17,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:08:17,165 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:08:17,166 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:08:17,167 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-11-16 20:08:17,216 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:08:17,216 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:08:17,217 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:08:17,217 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:08:17,218 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:08:17,218 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:08:17,218 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:08:17,219 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:08:17,219 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:08:17,219 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:08:17,220 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:08:17,220 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:08:17,220 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:08:17,221 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:08:17,221 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:08:17,221 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:08:17,221 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:08:17,221 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:08:17,222 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:08:17,222 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:08:17,222 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-16 20:08:17,223 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:08:17,223 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:08:17,224 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:08:17,224 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:08:17,225 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:08:17,226 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:08:17,226 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:08:17,226 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:08:17,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:08:17,227 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:08:17,227 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:08:17,228 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:08:17,229 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_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 [2022-11-16 20:08:17,519 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:08:17,542 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:08:17,544 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:08:17,546 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:08:17,547 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:08:17,548 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2022-11-16 20:08:17,611 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/data/6b6769e5e/3132962f86b847e09beae55af3f43bd8/FLAGf4d5aa44f [2022-11-16 20:08:18,106 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:08:18,107 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/sv-benchmarks/c/recursive/Fibonacci01-1.c [2022-11-16 20:08:18,113 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/data/6b6769e5e/3132962f86b847e09beae55af3f43bd8/FLAGf4d5aa44f [2022-11-16 20:08:18,475 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/data/6b6769e5e/3132962f86b847e09beae55af3f43bd8 [2022-11-16 20:08:18,481 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:08:18,482 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:08:18,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:08:18,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:08:18,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:08:18,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@112a743d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18, skipping insertion in model container [2022-11-16 20:08:18,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,498 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:08:18,510 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:08:18,697 WARN L229 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_8387aabf-933e-46a2-b29a-c7dbdc82ea74/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2022-11-16 20:08:18,698 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:08:18,706 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:08:18,722 WARN L229 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_8387aabf-933e-46a2-b29a-c7dbdc82ea74/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2022-11-16 20:08:18,722 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:08:18,736 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:08:18,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18 WrapperNode [2022-11-16 20:08:18,736 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:08:18,738 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:08:18,738 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:08:18,738 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:08:18,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,752 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,768 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 28 [2022-11-16 20:08:18,769 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:08:18,769 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:08:18,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:08:18,770 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:08:18,778 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,779 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,780 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,780 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,783 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,785 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,786 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,786 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,788 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:08:18,789 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:08:18,789 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:08:18,789 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:08:18,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (1/1) ... [2022-11-16 20:08:18,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:08:18,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:18,840 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:08:18,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:08:18,887 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2022-11-16 20:08:18,888 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2022-11-16 20:08:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:08:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:08:18,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:08:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:08:18,955 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:08:18,956 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:08:19,089 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:08:19,113 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:08:19,113 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-16 20:08:19,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:08:19 BoogieIcfgContainer [2022-11-16 20:08:19,116 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:08:19,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:08:19,118 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:08:19,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:08:19,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:08:18" (1/3) ... [2022-11-16 20:08:19,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b271222 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:08:19, skipping insertion in model container [2022-11-16 20:08:19,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:08:18" (2/3) ... [2022-11-16 20:08:19,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b271222 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:08:19, skipping insertion in model container [2022-11-16 20:08:19,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:08:19" (3/3) ... [2022-11-16 20:08:19,125 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2022-11-16 20:08:19,145 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:08:19,145 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2022-11-16 20:08:19,214 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:08:19,221 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;@1b48e906, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:08:19,222 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2022-11-16 20:08:19,226 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 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) [2022-11-16 20:08:19,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 20:08:19,235 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:19,235 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:19,236 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:19,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:19,241 INFO L85 PathProgramCache]: Analyzing trace with hash 898045137, now seen corresponding path program 1 times [2022-11-16 20:08:19,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:19,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746893792] [2022-11-16 20:08:19,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:19,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:19,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:08:19,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:19,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746893792] [2022-11-16 20:08:19,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746893792] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:19,492 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:19,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:08:19,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142274124] [2022-11-16 20:08:19,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:19,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:08:19,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:19,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:08:19,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:08:19,541 INFO L87 Difference]: Start difference. First operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 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 2.0) internal successors, (6), 4 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) [2022-11-16 20:08:19,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:19,720 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-11-16 20:08:19,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:08:19,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 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 [2022-11-16 20:08:19,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:19,731 INFO L225 Difference]: With dead ends: 33 [2022-11-16 20:08:19,731 INFO L226 Difference]: Without dead ends: 26 [2022-11-16 20:08:19,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:08:19,738 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 38 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:19,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 26 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:19,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-16 20:08:19,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-16 20:08:19,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 21 states have internal predecessors, (23), 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) [2022-11-16 20:08:19,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-16 20:08:19,778 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 7 [2022-11-16 20:08:19,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:19,779 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-16 20:08:19,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 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) [2022-11-16 20:08:19,779 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-16 20:08:19,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-16 20:08:19,781 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:19,781 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:19,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 20:08:19,782 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:19,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:19,784 INFO L85 PathProgramCache]: Analyzing trace with hash 2069595513, now seen corresponding path program 1 times [2022-11-16 20:08:19,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:19,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719712805] [2022-11-16 20:08:19,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:19,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:19,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:19,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:08:19,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:19,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719712805] [2022-11-16 20:08:19,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719712805] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:19,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:19,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 20:08:19,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786063504] [2022-11-16 20:08:19,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:19,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:08:19,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:19,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:08:19,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:08:19,880 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:08:19,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:19,919 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-11-16 20:08:19,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:08:19,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-16 20:08:19,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:19,922 INFO L225 Difference]: With dead ends: 28 [2022-11-16 20:08:19,922 INFO L226 Difference]: Without dead ends: 26 [2022-11-16 20:08:19,923 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 [2022-11-16 20:08:19,924 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 30 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 [2022-11-16 20:08:19,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 30 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:08:19,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-16 20:08:19,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-11-16 20:08:19,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 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) [2022-11-16 20:08:19,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-11-16 20:08:19,934 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 8 [2022-11-16 20:08:19,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:19,934 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-11-16 20:08:19,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:08:19,935 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-11-16 20:08:19,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-16 20:08:19,935 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:19,936 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:19,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 20:08:19,936 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:19,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:19,937 INFO L85 PathProgramCache]: Analyzing trace with hash 299865495, now seen corresponding path program 1 times [2022-11-16 20:08:19,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:19,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651167709] [2022-11-16 20:08:19,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:19,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:19,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:19,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:08:20,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:20,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651167709] [2022-11-16 20:08:20,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651167709] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:20,001 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:20,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:08:20,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447571688] [2022-11-16 20:08:20,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:20,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:08:20,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:20,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:08:20,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:08:20,003 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 20:08:20,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:20,020 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2022-11-16 20:08:20,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:08:20,020 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-16 20:08:20,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:20,021 INFO L225 Difference]: With dead ends: 24 [2022-11-16 20:08:20,022 INFO L226 Difference]: Without dead ends: 20 [2022-11-16 20:08:20,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:08:20,024 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:20,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 43 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:08:20,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-16 20:08:20,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-16 20:08:20,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:08:20,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-11-16 20:08:20,031 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 10 [2022-11-16 20:08:20,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:20,031 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-11-16 20:08:20,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 20:08:20,032 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-11-16 20:08:20,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-16 20:08:20,033 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:20,033 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:20,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:08:20,033 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:20,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:20,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1166742503, now seen corresponding path program 1 times [2022-11-16 20:08:20,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:20,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048883457] [2022-11-16 20:08:20,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:20,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:20,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:20,213 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-16 20:08:20,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:20,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048883457] [2022-11-16 20:08:20,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048883457] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:20,216 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:20,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:08:20,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042992783] [2022-11-16 20:08:20,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:20,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:08:20,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:20,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:08:20,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:08:20,222 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:08:20,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:20,307 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-16 20:08:20,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:08:20,308 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-11-16 20:08:20,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:20,309 INFO L225 Difference]: With dead ends: 36 [2022-11-16 20:08:20,309 INFO L226 Difference]: Without dead ends: 34 [2022-11-16 20:08:20,310 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 [2022-11-16 20:08:20,311 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:20,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 60 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:20,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-16 20:08:20,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2022-11-16 20:08:20,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-16 20:08:20,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-11-16 20:08:20,322 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2022-11-16 20:08:20,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:20,322 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-11-16 20:08:20,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:08:20,323 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-11-16 20:08:20,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:08:20,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:20,324 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] [2022-11-16 20:08:20,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-16 20:08:20,325 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:20,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:20,326 INFO L85 PathProgramCache]: Analyzing trace with hash 455941723, now seen corresponding path program 1 times [2022-11-16 20:08:20,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:20,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227530137] [2022-11-16 20:08:20,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:20,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:08:20,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:20,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227530137] [2022-11-16 20:08:20,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227530137] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:20,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070749174] [2022-11-16 20:08:20,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:20,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:20,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:20,534 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:20,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:08:20,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:20,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-16 20:08:20,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:20,783 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:08:20,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:20,991 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:08:20,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070749174] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:20,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751169106] [2022-11-16 20:08:21,024 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-16 20:08:21,024 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:21,028 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) [2022-11-16 20:08:21,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:21,030 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2022-11-16 20:08:21,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283923493] [2022-11-16 20:08:21,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:21,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 20:08:21,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:21,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 20:08:21,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-16 20:08:21,032 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:08:21,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:21,422 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2022-11-16 20:08:21,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:08:21,424 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2022-11-16 20:08:21,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:21,430 INFO L225 Difference]: With dead ends: 90 [2022-11-16 20:08:21,431 INFO L226 Difference]: Without dead ends: 64 [2022-11-16 20:08:21,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:08:21,440 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 119 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:21,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 67 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:21,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-16 20:08:21,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2022-11-16 20:08:21,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-16 20:08:21,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-11-16 20:08:21,466 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 30 [2022-11-16 20:08:21,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:21,466 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-11-16 20:08:21,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:08:21,467 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-11-16 20:08:21,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:08:21,468 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:21,468 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:21,474 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-16 20:08:21,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:21,673 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:21,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:21,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1228045225, now seen corresponding path program 2 times [2022-11-16 20:08:21,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:21,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161074511] [2022-11-16 20:08:21,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:21,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:21,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:21,820 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:08:21,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:21,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161074511] [2022-11-16 20:08:21,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161074511] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:21,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832010300] [2022-11-16 20:08:21,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:08:21,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:21,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:21,823 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:21,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 20:08:21,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:08:21,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:21,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 20:08:21,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:21,938 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:08:21,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:08:21,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832010300] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:21,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:08:21,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-11-16 20:08:21,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435672169] [2022-11-16 20:08:21,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:21,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:08:21,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:21,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:08:21,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:08:21,942 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-11-16 20:08:21,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:21,980 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2022-11-16 20:08:21,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:08:21,981 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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 24 [2022-11-16 20:08:21,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:21,986 INFO L225 Difference]: With dead ends: 60 [2022-11-16 20:08:21,986 INFO L226 Difference]: Without dead ends: 59 [2022-11-16 20:08:21,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:08:21,993 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 9 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:21,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 43 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:08:21,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-16 20:08:22,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2022-11-16 20:08:22,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-16 20:08:22,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2022-11-16 20:08:22,020 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2022-11-16 20:08:22,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:22,020 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2022-11-16 20:08:22,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-11-16 20:08:22,020 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2022-11-16 20:08:22,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 20:08:22,021 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:22,022 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, 1] [2022-11-16 20:08:22,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-16 20:08:22,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-16 20:08:22,223 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:22,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:22,223 INFO L85 PathProgramCache]: Analyzing trace with hash 569765849, now seen corresponding path program 1 times [2022-11-16 20:08:22,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:22,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358813420] [2022-11-16 20:08:22,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:22,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:22,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:22,314 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:08:22,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:22,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358813420] [2022-11-16 20:08:22,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358813420] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:22,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122680784] [2022-11-16 20:08:22,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:22,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:22,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:22,319 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:22,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 20:08:22,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:22,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 20:08:22,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:22,442 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:08:22,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:22,523 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:08:22,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122680784] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:22,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191891136] [2022-11-16 20:08:22,526 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:22,526 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:22,527 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) [2022-11-16 20:08:22,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:22,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2022-11-16 20:08:22,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004662654] [2022-11-16 20:08:22,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:22,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-16 20:08:22,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:22,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-16 20:08:22,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-11-16 20:08:22,529 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:08:22,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:22,643 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2022-11-16 20:08:22,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-16 20:08:22,645 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 31 [2022-11-16 20:08:22,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:22,646 INFO L225 Difference]: With dead ends: 69 [2022-11-16 20:08:22,647 INFO L226 Difference]: Without dead ends: 68 [2022-11-16 20:08:22,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-11-16 20:08:22,648 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 9 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:22,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 136 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:22,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-16 20:08:22,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2022-11-16 20:08:22,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2022-11-16 20:08:22,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2022-11-16 20:08:22,660 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 31 [2022-11-16 20:08:22,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:22,661 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2022-11-16 20:08:22,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:08:22,661 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2022-11-16 20:08:22,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-16 20:08:22,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:22,663 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:08:22,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:22,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-16 20:08:22,868 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:22,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:22,869 INFO L85 PathProgramCache]: Analyzing trace with hash -1537496952, now seen corresponding path program 1 times [2022-11-16 20:08:22,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:22,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547748391] [2022-11-16 20:08:22,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:22,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:22,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:23,137 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-16 20:08:23,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:23,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547748391] [2022-11-16 20:08:23,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547748391] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:23,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197934635] [2022-11-16 20:08:23,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:23,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:23,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:23,139 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:23,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 20:08:23,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:23,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-16 20:08:23,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:23,312 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-16 20:08:23,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-16 20:08:23,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197934635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:23,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448487750] [2022-11-16 20:08:23,554 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:23,554 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:23,554 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) [2022-11-16 20:08:23,555 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:23,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2022-11-16 20:08:23,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57218152] [2022-11-16 20:08:23,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:23,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-16 20:08:23,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:23,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-16 20:08:23,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-16 20:08:23,558 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-16 20:08:23,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:23,789 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2022-11-16 20:08:23,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-16 20:08:23,790 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 44 [2022-11-16 20:08:23,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:23,793 INFO L225 Difference]: With dead ends: 134 [2022-11-16 20:08:23,793 INFO L226 Difference]: Without dead ends: 133 [2022-11-16 20:08:23,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:08:23,795 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 39 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:23,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 134 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:23,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-16 20:08:23,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2022-11-16 20:08:23,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:08:23,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:08:23,813 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 44 [2022-11-16 20:08:23,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:23,813 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:08:23,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-16 20:08:23,814 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:08:23,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-16 20:08:23,816 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:23,816 INFO L195 NwaCegarLoop]: trace histogram [12, 9, 8, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1] [2022-11-16 20:08:23,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:24,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:24,022 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:24,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:24,022 INFO L85 PathProgramCache]: Analyzing trace with hash 963452127, now seen corresponding path program 1 times [2022-11-16 20:08:24,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:24,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162303554] [2022-11-16 20:08:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:24,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:24,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:24,190 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 298 trivial. 0 not checked. [2022-11-16 20:08:24,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:24,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162303554] [2022-11-16 20:08:24,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162303554] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:24,191 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:24,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:08:24,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047456930] [2022-11-16 20:08:24,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:24,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:08:24,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:24,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:08:24,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:08:24,194 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:08:24,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:24,242 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2022-11-16 20:08:24,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:08:24,242 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 103 [2022-11-16 20:08:24,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:24,250 INFO L225 Difference]: With dead ends: 111 [2022-11-16 20:08:24,250 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 20:08:24,251 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 [2022-11-16 20:08:24,254 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 67 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 [2022-11-16 20:08:24,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 67 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:08:24,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 20:08:24,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-16 20:08:24,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:08:24,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:08:24,296 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 103 [2022-11-16 20:08:24,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:24,297 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:08:24,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:08:24,297 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:08:24,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-16 20:08:24,308 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:24,309 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, 1] [2022-11-16 20:08:24,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-16 20:08:24,309 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:24,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:24,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1750085297, now seen corresponding path program 2 times [2022-11-16 20:08:24,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:24,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806699568] [2022-11-16 20:08:24,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:24,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:24,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:24,427 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-11-16 20:08:24,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:24,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806699568] [2022-11-16 20:08:24,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806699568] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:08:24,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:08:24,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:08:24,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11361815] [2022-11-16 20:08:24,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:08:24,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:08:24,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:24,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:08:24,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:08:24,429 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:08:24,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:24,467 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2022-11-16 20:08:24,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:08:24,467 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 70 [2022-11-16 20:08:24,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:24,470 INFO L225 Difference]: With dead ends: 111 [2022-11-16 20:08:24,470 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 20:08:24,471 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 [2022-11-16 20:08:24,472 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 55 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 [2022-11-16 20:08:24,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 55 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:08:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 20:08:24,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-16 20:08:24,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:08:24,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:08:24,508 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 70 [2022-11-16 20:08:24,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:24,509 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:08:24,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:08:24,510 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:08:24,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-16 20:08:24,517 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:24,518 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, 1] [2022-11-16 20:08:24,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-16 20:08:24,519 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:24,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:24,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1227543676, now seen corresponding path program 2 times [2022-11-16 20:08:24,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:24,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88234827] [2022-11-16 20:08:24,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:24,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:24,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:24,803 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 68 proven. 165 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2022-11-16 20:08:24,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:24,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88234827] [2022-11-16 20:08:24,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88234827] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:24,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793267577] [2022-11-16 20:08:24,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:08:24,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:24,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:24,806 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:24,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 20:08:24,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-16 20:08:24,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:24,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:08:24,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:25,015 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 85 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2022-11-16 20:08:25,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:25,572 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 88 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-11-16 20:08:25,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793267577] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:25,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423144766] [2022-11-16 20:08:25,578 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:25,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:25,579 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) [2022-11-16 20:08:25,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:25,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2022-11-16 20:08:25,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887938857] [2022-11-16 20:08:25,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:25,584 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 20:08:25,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:25,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 20:08:25,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-11-16 20:08:25,586 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2022-11-16 20:08:26,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:26,050 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2022-11-16 20:08:26,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 20:08:26,051 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) Word has length 128 [2022-11-16 20:08:26,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:26,052 INFO L225 Difference]: With dead ends: 175 [2022-11-16 20:08:26,052 INFO L226 Difference]: Without dead ends: 80 [2022-11-16 20:08:26,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 248 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:08:26,055 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 250 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:26,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 81 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:26,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-16 20:08:26,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2022-11-16 20:08:26,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 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) [2022-11-16 20:08:26,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2022-11-16 20:08:26,062 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 128 [2022-11-16 20:08:26,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:26,062 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2022-11-16 20:08:26,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2022-11-16 20:08:26,063 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2022-11-16 20:08:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-16 20:08:26,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:26,064 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, 1] [2022-11-16 20:08:26,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:26,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:26,270 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:26,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:26,270 INFO L85 PathProgramCache]: Analyzing trace with hash -573340710, now seen corresponding path program 3 times [2022-11-16 20:08:26,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:26,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159518343] [2022-11-16 20:08:26,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:26,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:26,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:26,442 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 93 proven. 48 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2022-11-16 20:08:26,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:26,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159518343] [2022-11-16 20:08:26,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159518343] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:26,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074650236] [2022-11-16 20:08:26,443 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:08:26,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:26,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:26,445 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:26,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 20:08:26,511 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:08:26,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:26,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:08:26,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:26,612 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 140 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-16 20:08:26,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:27,181 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 102 proven. 62 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2022-11-16 20:08:27,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074650236] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:27,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621719745] [2022-11-16 20:08:27,185 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:27,185 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:27,185 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) [2022-11-16 20:08:27,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:27,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2022-11-16 20:08:27,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202068272] [2022-11-16 20:08:27,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:27,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-16 20:08:27,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:27,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-16 20:08:27,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2022-11-16 20:08:27,189 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 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) [2022-11-16 20:08:27,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:27,418 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2022-11-16 20:08:27,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:08:27,419 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 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 90 [2022-11-16 20:08:27,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:27,420 INFO L225 Difference]: With dead ends: 131 [2022-11-16 20:08:27,420 INFO L226 Difference]: Without dead ends: 64 [2022-11-16 20:08:27,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 171 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:08:27,422 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 94 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:27,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 74 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:27,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-16 20:08:27,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-11-16 20:08:27,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-16 20:08:27,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-11-16 20:08:27,428 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 90 [2022-11-16 20:08:27,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:27,428 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-11-16 20:08:27,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 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) [2022-11-16 20:08:27,429 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-11-16 20:08:27,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-16 20:08:27,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:27,430 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, 1] [2022-11-16 20:08:27,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:27,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-16 20:08:27,636 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:27,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:27,636 INFO L85 PathProgramCache]: Analyzing trace with hash -475477922, now seen corresponding path program 3 times [2022-11-16 20:08:27,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:27,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656342232] [2022-11-16 20:08:27,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:27,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:27,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:27,905 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-11-16 20:08:27,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:27,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656342232] [2022-11-16 20:08:27,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656342232] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:27,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385894271] [2022-11-16 20:08:27,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:08:27,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:27,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:27,908 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:27,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 20:08:27,993 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:08:27,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:27,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 20:08:27,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:28,095 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-16 20:08:28,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:28,319 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-16 20:08:28,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385894271] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:28,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2019382079] [2022-11-16 20:08:28,322 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:28,322 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:28,323 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) [2022-11-16 20:08:28,324 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:28,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2022-11-16 20:08:28,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067834564] [2022-11-16 20:08:28,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:28,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 20:08:28,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:28,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 20:08:28,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2022-11-16 20:08:28,326 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 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) [2022-11-16 20:08:28,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:28,490 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2022-11-16 20:08:28,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:08:28,491 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 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 84 [2022-11-16 20:08:28,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:28,492 INFO L225 Difference]: With dead ends: 68 [2022-11-16 20:08:28,492 INFO L226 Difference]: Without dead ends: 67 [2022-11-16 20:08:28,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 164 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2022-11-16 20:08:28,493 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 23 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:28,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 163 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:08:28,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-16 20:08:28,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2022-11-16 20:08:28,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-16 20:08:28,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-11-16 20:08:28,498 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 84 [2022-11-16 20:08:28,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:28,498 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-11-16 20:08:28,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 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) [2022-11-16 20:08:28,500 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-11-16 20:08:28,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-16 20:08:28,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:28,501 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2022-11-16 20:08:28,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:28,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:28,713 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:28,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:28,713 INFO L85 PathProgramCache]: Analyzing trace with hash -935614288, now seen corresponding path program 4 times [2022-11-16 20:08:28,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:28,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398601913] [2022-11-16 20:08:28,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:28,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:28,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:29,035 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 142 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2022-11-16 20:08:29,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:29,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398601913] [2022-11-16 20:08:29,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398601913] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:29,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968359495] [2022-11-16 20:08:29,036 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:08:29,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:29,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:29,038 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:29,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 20:08:29,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:29,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-16 20:08:29,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:29,244 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 182 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2022-11-16 20:08:29,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:29,997 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 202 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2022-11-16 20:08:29,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968359495] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:29,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [380297242] [2022-11-16 20:08:30,000 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:30,000 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:30,000 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) [2022-11-16 20:08:30,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:30,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 20 [2022-11-16 20:08:30,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282768798] [2022-11-16 20:08:30,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:30,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 20:08:30,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:30,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 20:08:30,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-11-16 20:08:30,004 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-16 20:08:30,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:30,376 INFO L93 Difference]: Finished difference Result 130 states and 155 transitions. [2022-11-16 20:08:30,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 20:08:30,377 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) Word has length 122 [2022-11-16 20:08:30,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:30,378 INFO L225 Difference]: With dead ends: 130 [2022-11-16 20:08:30,378 INFO L226 Difference]: Without dead ends: 72 [2022-11-16 20:08:30,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 233 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2022-11-16 20:08:30,379 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 134 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:30,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 101 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:30,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-16 20:08:30,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2022-11-16 20:08:30,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2022-11-16 20:08:30,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2022-11-16 20:08:30,385 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 122 [2022-11-16 20:08:30,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:30,385 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2022-11-16 20:08:30,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-16 20:08:30,386 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2022-11-16 20:08:30,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-11-16 20:08:30,388 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:30,388 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 15, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 6, 4, 1, 1, 1, 1] [2022-11-16 20:08:30,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:30,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-16 20:08:30,594 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:30,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:30,595 INFO L85 PathProgramCache]: Analyzing trace with hash -759625417, now seen corresponding path program 5 times [2022-11-16 20:08:30,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:30,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642477720] [2022-11-16 20:08:30,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:30,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:30,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 205 proven. 423 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2022-11-16 20:08:30,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:30,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642477720] [2022-11-16 20:08:30,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642477720] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:30,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112543174] [2022-11-16 20:08:30,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:08:30,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:30,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:30,998 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:31,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 20:08:31,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-16 20:08:31,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:31,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-16 20:08:31,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:31,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 336 proven. 253 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2022-11-16 20:08:31,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 336 proven. 271 refuted. 0 times theorem prover too weak. 498 trivial. 0 not checked. [2022-11-16 20:08:32,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112543174] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:32,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [401608164] [2022-11-16 20:08:32,059 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:32,059 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:32,060 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) [2022-11-16 20:08:32,061 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:32,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15] total 22 [2022-11-16 20:08:32,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141194399] [2022-11-16 20:08:32,062 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:32,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-16 20:08:32,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:32,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-16 20:08:32,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-11-16 20:08:32,065 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 22 states have internal predecessors, (117), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) [2022-11-16 20:08:32,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:32,608 INFO L93 Difference]: Finished difference Result 163 states and 199 transitions. [2022-11-16 20:08:32,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-16 20:08:32,609 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 22 states have internal predecessors, (117), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) Word has length 181 [2022-11-16 20:08:32,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:32,610 INFO L225 Difference]: With dead ends: 163 [2022-11-16 20:08:32,610 INFO L226 Difference]: Without dead ends: 99 [2022-11-16 20:08:32,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 352 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1085, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:08:32,612 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 268 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:32,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 76 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:32,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-16 20:08:32,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 82. [2022-11-16 20:08:32,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2022-11-16 20:08:32,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2022-11-16 20:08:32,622 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 181 [2022-11-16 20:08:32,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:32,623 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2022-11-16 20:08:32,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 22 states have internal predecessors, (117), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) [2022-11-16 20:08:32,623 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2022-11-16 20:08:32,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-16 20:08:32,625 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:32,625 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 12, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 3, 1, 1, 1, 1] [2022-11-16 20:08:32,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:32,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-16 20:08:32,831 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:32,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:32,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1016289969, now seen corresponding path program 6 times [2022-11-16 20:08:32,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:32,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759457413] [2022-11-16 20:08:32,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:32,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:32,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:33,396 INFO L134 CoverageAnalysis]: Checked inductivity of 662 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2022-11-16 20:08:33,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:33,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759457413] [2022-11-16 20:08:33,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759457413] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:33,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244385908] [2022-11-16 20:08:33,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:08:33,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:33,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:33,399 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:33,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 20:08:33,505 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:08:33,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:33,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-16 20:08:33,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:33,718 INFO L134 CoverageAnalysis]: Checked inductivity of 662 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2022-11-16 20:08:33,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:35,122 INFO L134 CoverageAnalysis]: Checked inductivity of 662 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-16 20:08:35,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244385908] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:35,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759209035] [2022-11-16 20:08:35,124 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:35,124 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:35,125 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) [2022-11-16 20:08:35,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:35,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2022-11-16 20:08:35,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554221818] [2022-11-16 20:08:35,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:35,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 20:08:35,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:35,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 20:08:35,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2022-11-16 20:08:35,127 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2022-11-16 20:08:35,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:35,382 INFO L93 Difference]: Finished difference Result 113 states and 144 transitions. [2022-11-16 20:08:35,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-16 20:08:35,383 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) Word has length 142 [2022-11-16 20:08:35,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:35,384 INFO L225 Difference]: With dead ends: 113 [2022-11-16 20:08:35,384 INFO L226 Difference]: Without dead ends: 112 [2022-11-16 20:08:35,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 268 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=293, Invalid=967, Unknown=0, NotChecked=0, Total=1260 [2022-11-16 20:08:35,385 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 44 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:35,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 200 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:35,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-16 20:08:35,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2022-11-16 20:08:35,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 81 states have (on average 1.037037037037037) internal successors, (84), 79 states have internal predecessors, (84), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (34), 14 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-16 20:08:35,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 130 transitions. [2022-11-16 20:08:35,396 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 130 transitions. Word has length 142 [2022-11-16 20:08:35,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:35,396 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 130 transitions. [2022-11-16 20:08:35,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2022-11-16 20:08:35,397 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 130 transitions. [2022-11-16 20:08:35,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2022-11-16 20:08:35,419 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:35,419 INFO L195 NwaCegarLoop]: trace histogram [49, 45, 40, 25, 25, 25, 25, 23, 23, 23, 23, 23, 22, 22, 21, 21, 15, 9, 1, 1, 1, 1] [2022-11-16 20:08:35,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:35,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-16 20:08:35,625 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:35,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:35,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1327223165, now seen corresponding path program 7 times [2022-11-16 20:08:35,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:35,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826078476] [2022-11-16 20:08:35,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:35,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:35,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:36,528 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 572 proven. 1908 refuted. 0 times theorem prover too weak. 5216 trivial. 0 not checked. [2022-11-16 20:08:36,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:36,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826078476] [2022-11-16 20:08:36,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826078476] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:36,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548309145] [2022-11-16 20:08:36,529 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:08:36,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:36,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:36,531 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:36,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 20:08:36,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:36,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 881 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-16 20:08:36,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:36,993 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 3997 proven. 1274 refuted. 0 times theorem prover too weak. 2425 trivial. 0 not checked. [2022-11-16 20:08:36,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:38,613 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 663 proven. 2447 refuted. 0 times theorem prover too weak. 4586 trivial. 0 not checked. [2022-11-16 20:08:38,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548309145] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:38,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1193723379] [2022-11-16 20:08:38,616 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:38,616 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:38,616 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) [2022-11-16 20:08:38,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:38,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 21] total 26 [2022-11-16 20:08:38,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110528219] [2022-11-16 20:08:38,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:38,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 20:08:38,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:38,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 20:08:38,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2022-11-16 20:08:38,621 INFO L87 Difference]: Start difference. First operand 102 states and 130 transitions. Second operand has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2022-11-16 20:08:39,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:39,283 INFO L93 Difference]: Finished difference Result 238 states and 327 transitions. [2022-11-16 20:08:39,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-16 20:08:39,284 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) Word has length 463 [2022-11-16 20:08:39,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:39,286 INFO L225 Difference]: With dead ends: 238 [2022-11-16 20:08:39,286 INFO L226 Difference]: Without dead ends: 141 [2022-11-16 20:08:39,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 911 SyntacticMatches, 13 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=568, Invalid=1502, Unknown=0, NotChecked=0, Total=2070 [2022-11-16 20:08:39,288 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 434 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:39,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [434 Valid, 91 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:08:39,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-16 20:08:39,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 128. [2022-11-16 20:08:39,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 99 states have internal predecessors, (108), 15 states have call successors, (15), 11 states have call predecessors, (15), 9 states have return successors, (37), 17 states have call predecessors, (37), 14 states have call successors, (37) [2022-11-16 20:08:39,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 160 transitions. [2022-11-16 20:08:39,299 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 160 transitions. Word has length 463 [2022-11-16 20:08:39,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:39,299 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 160 transitions. [2022-11-16 20:08:39,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2022-11-16 20:08:39,300 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 160 transitions. [2022-11-16 20:08:39,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2022-11-16 20:08:39,304 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:39,304 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2022-11-16 20:08:39,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:39,510 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:39,511 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:39,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:39,511 INFO L85 PathProgramCache]: Analyzing trace with hash -116726609, now seen corresponding path program 8 times [2022-11-16 20:08:39,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:39,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697658585] [2022-11-16 20:08:39,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:39,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:39,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:40,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 509 proven. 990 refuted. 0 times theorem prover too weak. 1637 trivial. 0 not checked. [2022-11-16 20:08:40,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:40,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697658585] [2022-11-16 20:08:40,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697658585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:40,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132422530] [2022-11-16 20:08:40,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:08:40,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:40,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:40,034 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:40,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 20:08:40,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-16 20:08:40,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:40,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-16 20:08:40,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 771 proven. 527 refuted. 0 times theorem prover too weak. 1838 trivial. 0 not checked. [2022-11-16 20:08:40,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:41,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 779 proven. 552 refuted. 0 times theorem prover too weak. 1805 trivial. 0 not checked. [2022-11-16 20:08:41,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132422530] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:41,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814857546] [2022-11-16 20:08:41,608 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:41,608 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:41,609 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java: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) [2022-11-16 20:08:41,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:41,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 17] total 27 [2022-11-16 20:08:41,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836960821] [2022-11-16 20:08:41,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:41,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-16 20:08:41,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:41,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-16 20:08:41,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2022-11-16 20:08:41,614 INFO L87 Difference]: Start difference. First operand 128 states and 160 transitions. Second operand has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2022-11-16 20:08:42,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:42,258 INFO L93 Difference]: Finished difference Result 255 states and 343 transitions. [2022-11-16 20:08:42,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-16 20:08:42,259 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) Word has length 299 [2022-11-16 20:08:42,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:42,260 INFO L225 Difference]: With dead ends: 255 [2022-11-16 20:08:42,260 INFO L226 Difference]: Without dead ends: 132 [2022-11-16 20:08:42,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 583 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=427, Invalid=1295, Unknown=0, NotChecked=0, Total=1722 [2022-11-16 20:08:42,262 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 201 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:42,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 202 Invalid, 698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:08:42,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-11-16 20:08:42,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 111. [2022-11-16 20:08:42,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 87 states have internal predecessors, (92), 14 states have call successors, (14), 11 states have call predecessors, (14), 7 states have return successors, (28), 12 states have call predecessors, (28), 13 states have call successors, (28) [2022-11-16 20:08:42,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2022-11-16 20:08:42,272 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 299 [2022-11-16 20:08:42,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:42,274 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2022-11-16 20:08:42,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2022-11-16 20:08:42,275 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2022-11-16 20:08:42,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 746 [2022-11-16 20:08:42,297 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:42,297 INFO L195 NwaCegarLoop]: trace histogram [77, 75, 62, 38, 38, 38, 38, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2022-11-16 20:08:42,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:42,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 20:08:42,507 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:42,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:42,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1908612362, now seen corresponding path program 9 times [2022-11-16 20:08:42,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:42,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200605708] [2022-11-16 20:08:42,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:42,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:42,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:44,162 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 1135 proven. 4435 refuted. 0 times theorem prover too weak. 14606 trivial. 0 not checked. [2022-11-16 20:08:44,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:44,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200605708] [2022-11-16 20:08:44,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200605708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:44,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945763021] [2022-11-16 20:08:44,163 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:08:44,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:44,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:44,175 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:44,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 20:08:44,417 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:08:44,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:08:44,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-16 20:08:44,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:44,778 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 10304 proven. 2732 refuted. 0 times theorem prover too weak. 7140 trivial. 0 not checked. [2022-11-16 20:08:44,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:47,604 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 1388 proven. 5273 refuted. 0 times theorem prover too weak. 13515 trivial. 0 not checked. [2022-11-16 20:08:47,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945763021] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:47,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285942068] [2022-11-16 20:08:47,607 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:47,607 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:47,607 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) [2022-11-16 20:08:47,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:47,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 26] total 31 [2022-11-16 20:08:47,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73200232] [2022-11-16 20:08:47,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:47,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:08:47,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:47,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:08:47,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=777, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:08:47,612 INFO L87 Difference]: Start difference. First operand 111 states and 134 transitions. Second operand has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) [2022-11-16 20:08:48,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:08:48,528 INFO L93 Difference]: Finished difference Result 266 states and 346 transitions. [2022-11-16 20:08:48,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-16 20:08:48,529 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) Word has length 745 [2022-11-16 20:08:48,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:08:48,531 INFO L225 Difference]: With dead ends: 266 [2022-11-16 20:08:48,531 INFO L226 Difference]: Without dead ends: 160 [2022-11-16 20:08:48,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1543 GetRequests, 1472 SyntacticMatches, 14 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=861, Invalid=2561, Unknown=0, NotChecked=0, Total=3422 [2022-11-16 20:08:48,533 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 635 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 349 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 349 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:08:48,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [635 Valid, 130 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [349 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:08:48,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-16 20:08:48,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 124. [2022-11-16 20:08:48,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 98 states have internal predecessors, (102), 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) [2022-11-16 20:08:48,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2022-11-16 20:08:48,544 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 745 [2022-11-16 20:08:48,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:08:48,545 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2022-11-16 20:08:48,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) [2022-11-16 20:08:48,546 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2022-11-16 20:08:48,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2022-11-16 20:08:48,549 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:08:48,549 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1, 1] [2022-11-16 20:08:48,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 20:08:48,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:48,756 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:08:48,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:08:48,757 INFO L85 PathProgramCache]: Analyzing trace with hash -885029408, now seen corresponding path program 10 times [2022-11-16 20:08:48,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:08:48,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670946886] [2022-11-16 20:08:48,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:08:48,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:08:48,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:51,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2022-11-16 20:08:51,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:08:51,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670946886] [2022-11-16 20:08:51,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670946886] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:08:51,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227230900] [2022-11-16 20:08:51,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:08:51,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:08:51,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:08:51,787 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:08:51,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 20:08:52,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:08:52,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-16 20:08:52,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:08:52,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3696 trivial. 0 not checked. [2022-11-16 20:08:52,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:08:59,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3464 trivial. 0 not checked. [2022-11-16 20:08:59,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227230900] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:08:59,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837161414] [2022-11-16 20:08:59,875 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:08:59,875 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:08:59,875 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) [2022-11-16 20:08:59,876 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:08:59,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2022-11-16 20:08:59,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166615132] [2022-11-16 20:08:59,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:08:59,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-16 20:08:59,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:08:59,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-16 20:08:59,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2022-11-16 20:08:59,879 INFO L87 Difference]: Start difference. First operand 124 states and 153 transitions. Second operand has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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) [2022-11-16 20:09:00,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:09:00,135 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2022-11-16 20:09:00,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:09:00,136 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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 397 [2022-11-16 20:09:00,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:09:00,138 INFO L225 Difference]: With dead ends: 155 [2022-11-16 20:09:00,138 INFO L226 Difference]: Without dead ends: 154 [2022-11-16 20:09:00,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 778 SyntacticMatches, 51 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2454 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2022-11-16 20:09:00,140 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 65 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:09:00,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 196 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:09:00,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2022-11-16 20:09:00,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 144. [2022-11-16 20:09:00,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 113 states have internal predecessors, (118), 18 states have call successors, (18), 12 states have call predecessors, (18), 10 states have return successors, (55), 18 states have call predecessors, (55), 17 states have call successors, (55) [2022-11-16 20:09:00,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2022-11-16 20:09:00,152 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 397 [2022-11-16 20:09:00,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:09:00,152 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2022-11-16 20:09:00,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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) [2022-11-16 20:09:00,153 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2022-11-16 20:09:00,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2022-11-16 20:09:00,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:09:00,167 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, 1] [2022-11-16 20:09:00,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-16 20:09:00,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:09:00,373 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:09:00,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:09:00,374 INFO L85 PathProgramCache]: Analyzing trace with hash 277739508, now seen corresponding path program 11 times [2022-11-16 20:09:00,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:09:00,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675611524] [2022-11-16 20:09:00,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:09:00,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:09:00,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:09:03,115 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 2271 proven. 8825 refuted. 0 times theorem prover too weak. 44207 trivial. 0 not checked. [2022-11-16 20:09:03,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:09:03,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675611524] [2022-11-16 20:09:03,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675611524] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:09:03,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131021036] [2022-11-16 20:09:03,116 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:09:03,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:09:03,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:09:03,117 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:09:03,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 20:09:03,806 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-11-16 20:09:03,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:09:03,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 1566 conjuncts, 165 conjunts are in the unsatisfiable core [2022-11-16 20:09:03,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:09:05,071 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 16340 proven. 4556 refuted. 0 times theorem prover too weak. 34407 trivial. 0 not checked. [2022-11-16 20:09:05,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:09:31,083 INFO L134 CoverageAnalysis]: Checked inductivity of 55303 backedges. 17207 proven. 4221 refuted. 0 times theorem prover too weak. 33875 trivial. 0 not checked. [2022-11-16 20:09:31,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131021036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:09:31,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527922451] [2022-11-16 20:09:31,087 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:09:31,087 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:09:31,088 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) [2022-11-16 20:09:31,089 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:09:31,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 38] total 65 [2022-11-16 20:09:31,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395956196] [2022-11-16 20:09:31,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:09:31,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-16 20:09:31,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:09:31,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-16 20:09:31,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=3618, Unknown=0, NotChecked=0, Total=4160 [2022-11-16 20:09:31,097 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 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) [2022-11-16 20:09:34,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:09:34,310 INFO L93 Difference]: Finished difference Result 395 states and 605 transitions. [2022-11-16 20:09:34,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-16 20:09:34,311 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 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 1228 [2022-11-16 20:09:34,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:09:34,314 INFO L225 Difference]: With dead ends: 395 [2022-11-16 20:09:34,314 INFO L226 Difference]: Without dead ends: 256 [2022-11-16 20:09:34,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2316 SyntacticMatches, 109 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9134 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2535, Invalid=15287, Unknown=0, NotChecked=0, Total=17822 [2022-11-16 20:09:34,324 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 604 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 1344 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 604 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 1344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:09:34,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [604 Valid, 153 Invalid, 1648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 1344 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-16 20:09:34,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-16 20:09:34,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 218. [2022-11-16 20:09:34,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 171 states have internal predecessors, (180), 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) [2022-11-16 20:09:34,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 315 transitions. [2022-11-16 20:09:34,345 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 315 transitions. Word has length 1228 [2022-11-16 20:09:34,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:09:34,346 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 315 transitions. [2022-11-16 20:09:34,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 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) [2022-11-16 20:09:34,347 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 315 transitions. [2022-11-16 20:09:34,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2669 [2022-11-16 20:09:34,419 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:09:34,420 INFO L195 NwaCegarLoop]: trace histogram [273, 271, 221, 136, 136, 136, 136, 136, 136, 136, 136, 136, 135, 135, 134, 134, 85, 52, 1, 1, 1, 1] [2022-11-16 20:09:34,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-16 20:09:34,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:09:34,621 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:09:34,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:09:34,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1276713116, now seen corresponding path program 12 times [2022-11-16 20:09:34,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:09:34,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194405243] [2022-11-16 20:09:34,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:09:34,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:09:35,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:09:43,807 INFO L134 CoverageAnalysis]: Checked inductivity of 262997 backedges. 3581 proven. 25562 refuted. 0 times theorem prover too weak. 233854 trivial. 0 not checked. [2022-11-16 20:09:43,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:09:43,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194405243] [2022-11-16 20:09:43,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194405243] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:09:43,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478648615] [2022-11-16 20:09:43,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:09:43,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:09:43,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:09:43,815 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:09:43,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 20:09:44,815 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:09:44,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:09:44,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 3306 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-16 20:09:44,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:09:45,159 INFO L134 CoverageAnalysis]: Checked inductivity of 262997 backedges. 89871 proven. 2667 refuted. 0 times theorem prover too weak. 170459 trivial. 0 not checked. [2022-11-16 20:09:45,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:09:52,834 INFO L134 CoverageAnalysis]: Checked inductivity of 262997 backedges. 3572 proven. 26641 refuted. 0 times theorem prover too weak. 232784 trivial. 0 not checked. [2022-11-16 20:09:52,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478648615] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:09:52,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250832055] [2022-11-16 20:09:52,837 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:09:52,837 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:09:52,838 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) [2022-11-16 20:09:52,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:09:52,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 27] total 32 [2022-11-16 20:09:52,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122158568] [2022-11-16 20:09:52,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:09:52,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 20:09:52,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:09:52,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 20:09:52,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2022-11-16 20:09:52,847 INFO L87 Difference]: Start difference. First operand 218 states and 315 transitions. Second operand has 32 states, 32 states have (on average 5.6875) internal successors, (182), 32 states have internal predecessors, (182), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (41), 14 states have call predecessors, (41), 26 states have call successors, (41) [2022-11-16 20:09:53,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:09:53,624 INFO L93 Difference]: Finished difference Result 414 states and 635 transitions. [2022-11-16 20:09:53,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:09:53,632 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.6875) internal successors, (182), 32 states have internal predecessors, (182), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (41), 14 states have call predecessors, (41), 26 states have call successors, (41) Word has length 2668 [2022-11-16 20:09:53,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:09:53,635 INFO L225 Difference]: With dead ends: 414 [2022-11-16 20:09:53,635 INFO L226 Difference]: Without dead ends: 201 [2022-11-16 20:09:53,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5380 GetRequests, 5319 SyntacticMatches, 13 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2022-11-16 20:09:53,641 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 201 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:09:53,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 246 Invalid, 899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 723 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 20:09:53,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-11-16 20:09:53,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 165. [2022-11-16 20:09:53,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 130 states have internal predecessors, (135), 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) [2022-11-16 20:09:53,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 223 transitions. [2022-11-16 20:09:53,656 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 223 transitions. Word has length 2668 [2022-11-16 20:09:53,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:09:53,657 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 223 transitions. [2022-11-16 20:09:53,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.6875) internal successors, (182), 32 states have internal predecessors, (182), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (41), 14 states have call predecessors, (41), 26 states have call successors, (41) [2022-11-16 20:09:53,657 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 223 transitions. [2022-11-16 20:09:53,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1320 [2022-11-16 20:09:53,673 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:09:53,673 INFO L195 NwaCegarLoop]: trace histogram [135, 134, 109, 67, 67, 67, 67, 67, 67, 67, 67, 67, 67, 67, 66, 66, 42, 26, 1, 1, 1, 1] [2022-11-16 20:09:53,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-16 20:09:53,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-16 20:09:53,884 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:09:53,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:09:53,885 INFO L85 PathProgramCache]: Analyzing trace with hash 15947063, now seen corresponding path program 13 times [2022-11-16 20:09:53,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:09:53,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515902554] [2022-11-16 20:09:53,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:09:53,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:09:54,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:09:57,067 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 4441 proven. 10243 refuted. 0 times theorem prover too weak. 49158 trivial. 0 not checked. [2022-11-16 20:09:57,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:09:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515902554] [2022-11-16 20:09:57,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515902554] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:09:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831714351] [2022-11-16 20:09:57,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:09:57,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:09:57,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:09:57,069 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:09:57,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 20:09:57,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:09:57,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 2464 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:09:57,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:09:58,306 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 5143 proven. 10902 refuted. 0 times theorem prover too weak. 47797 trivial. 0 not checked. [2022-11-16 20:09:58,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:10:04,267 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 5143 proven. 11133 refuted. 0 times theorem prover too weak. 47566 trivial. 0 not checked. [2022-11-16 20:10:04,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831714351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:10:04,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830683538] [2022-11-16 20:10:04,270 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:10:04,270 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:10:04,270 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) [2022-11-16 20:10:04,271 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:10:04,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2022-11-16 20:10:04,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354199906] [2022-11-16 20:10:04,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:10:04,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-16 20:10:04,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:04,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-16 20:10:04,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1309, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 20:10:04,277 INFO L87 Difference]: Start difference. First operand 165 states and 223 transitions. Second operand has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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) [2022-11-16 20:10:05,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:05,639 INFO L93 Difference]: Finished difference Result 382 states and 570 transitions. [2022-11-16 20:10:05,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-16 20:10:05,640 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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 1319 [2022-11-16 20:10:05,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:05,643 INFO L225 Difference]: With dead ends: 382 [2022-11-16 20:10:05,643 INFO L226 Difference]: Without dead ends: 222 [2022-11-16 20:10:05,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2708 GetRequests, 2617 SyntacticMatches, 17 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1492 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1360, Invalid=4340, Unknown=0, NotChecked=0, Total=5700 [2022-11-16 20:10:05,647 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 683 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 597 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 683 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 597 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:05,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [683 Valid, 219 Invalid, 1335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [597 Valid, 738 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 20:10:05,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-16 20:10:05,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 209. [2022-11-16 20:10:05,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 169 states have (on average 1.029585798816568) internal successors, (174), 165 states have internal predecessors, (174), 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) [2022-11-16 20:10:05,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 280 transitions. [2022-11-16 20:10:05,662 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 280 transitions. Word has length 1319 [2022-11-16 20:10:05,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:05,663 INFO L495 AbstractCegarLoop]: Abstraction has 209 states and 280 transitions. [2022-11-16 20:10:05,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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) [2022-11-16 20:10:05,664 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 280 transitions. [2022-11-16 20:10:05,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1418 [2022-11-16 20:10:05,681 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:05,682 INFO L195 NwaCegarLoop]: trace histogram [145, 144, 117, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 71, 71, 45, 28, 1, 1, 1, 1] [2022-11-16 20:10:05,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:05,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:05,882 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:10:05,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:05,883 INFO L85 PathProgramCache]: Analyzing trace with hash -802273328, now seen corresponding path program 14 times [2022-11-16 20:10:05,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:05,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259486894] [2022-11-16 20:10:05,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:05,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:08,750 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 7958 proven. 3643 refuted. 0 times theorem prover too weak. 62146 trivial. 0 not checked. [2022-11-16 20:10:08,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:08,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259486894] [2022-11-16 20:10:08,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259486894] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:08,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890201969] [2022-11-16 20:10:08,751 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:10:08,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:08,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:08,752 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:08,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 20:10:09,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-11-16 20:10:09,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:10:09,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 1037 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 20:10:09,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:09,806 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 8077 proven. 1646 refuted. 0 times theorem prover too weak. 64024 trivial. 0 not checked. [2022-11-16 20:10:09,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:10:12,913 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 8077 proven. 1722 refuted. 0 times theorem prover too weak. 63948 trivial. 0 not checked. [2022-11-16 20:10:12,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890201969] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:10:12,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [192019509] [2022-11-16 20:10:12,915 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:10:12,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:10:12,916 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) [2022-11-16 20:10:12,917 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:10:12,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 21] total 31 [2022-11-16 20:10:12,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851845787] [2022-11-16 20:10:12,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:10:12,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:10:12,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:12,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:10:12,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=756, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:10:12,923 INFO L87 Difference]: Start difference. First operand 209 states and 280 transitions. Second operand has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2022-11-16 20:10:13,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:13,768 INFO L93 Difference]: Finished difference Result 425 states and 573 transitions. [2022-11-16 20:10:13,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 20:10:13,770 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) Word has length 1417 [2022-11-16 20:10:13,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:13,773 INFO L225 Difference]: With dead ends: 425 [2022-11-16 20:10:13,774 INFO L226 Difference]: Without dead ends: 221 [2022-11-16 20:10:13,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2883 GetRequests, 2819 SyntacticMatches, 10 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=741, Invalid=2339, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:10:13,777 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 338 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:13,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [338 Valid, 224 Invalid, 923 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 20:10:13,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-16 20:10:13,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 189. [2022-11-16 20:10:13,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.026143790849673) internal successors, (157), 150 states have internal predecessors, (157), 25 states have call successors, (25), 20 states have call predecessors, (25), 10 states have return successors, (52), 18 states have call predecessors, (52), 24 states have call successors, (52) [2022-11-16 20:10:13,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 234 transitions. [2022-11-16 20:10:13,790 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 234 transitions. Word has length 1417 [2022-11-16 20:10:13,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:13,791 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 234 transitions. [2022-11-16 20:10:13,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2022-11-16 20:10:13,792 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 234 transitions. [2022-11-16 20:10:13,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1477 [2022-11-16 20:10:13,810 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:13,811 INFO L195 NwaCegarLoop]: trace histogram [151, 150, 122, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 74, 74, 47, 29, 1, 1, 1, 1] [2022-11-16 20:10:13,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:14,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-16 20:10:14,020 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:10:14,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:14,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1463774903, now seen corresponding path program 15 times [2022-11-16 20:10:14,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:14,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715093214] [2022-11-16 20:10:14,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:14,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:14,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:17,485 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 6528 proven. 10102 refuted. 0 times theorem prover too weak. 63427 trivial. 0 not checked. [2022-11-16 20:10:17,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:17,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715093214] [2022-11-16 20:10:17,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715093214] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:17,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902933294] [2022-11-16 20:10:17,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:10:17,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:17,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:17,487 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:17,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 20:10:18,331 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:10:18,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:10:18,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 1830 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:10:18,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:18,668 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 10882 refuted. 0 times theorem prover too weak. 61872 trivial. 0 not checked. [2022-11-16 20:10:18,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:10:24,941 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 11117 refuted. 0 times theorem prover too weak. 61637 trivial. 0 not checked. [2022-11-16 20:10:24,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902933294] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:10:24,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170520278] [2022-11-16 20:10:24,943 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:10:24,944 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:10:24,944 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) [2022-11-16 20:10:24,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:10:24,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2022-11-16 20:10:24,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788455099] [2022-11-16 20:10:24,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:10:24,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-16 20:10:24,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:24,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-16 20:10:24,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 20:10:24,951 INFO L87 Difference]: Start difference. First operand 189 states and 234 transitions. Second operand has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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) [2022-11-16 20:10:26,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:26,139 INFO L93 Difference]: Finished difference Result 415 states and 543 transitions. [2022-11-16 20:10:26,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-16 20:10:26,140 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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 1476 [2022-11-16 20:10:26,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:26,143 INFO L225 Difference]: With dead ends: 415 [2022-11-16 20:10:26,143 INFO L226 Difference]: Without dead ends: 231 [2022-11-16 20:10:26,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3008 GetRequests, 2929 SyntacticMatches, 17 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=999, Invalid=3033, Unknown=0, NotChecked=0, Total=4032 [2022-11-16 20:10:26,145 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 678 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 1090 mSolverCounterSat, 610 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 678 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 1700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 610 IncrementalHoareTripleChecker+Valid, 1090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:26,146 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [678 Valid, 342 Invalid, 1700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [610 Valid, 1090 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:10:26,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-11-16 20:10:26,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 174. [2022-11-16 20:10:26,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 138 states have internal predecessors, (143), 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) [2022-11-16 20:10:26,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 224 transitions. [2022-11-16 20:10:26,178 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 224 transitions. Word has length 1476 [2022-11-16 20:10:26,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:26,180 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 224 transitions. [2022-11-16 20:10:26,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 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) [2022-11-16 20:10:26,181 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 224 transitions. [2022-11-16 20:10:26,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2830 [2022-11-16 20:10:26,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:26,245 INFO L195 NwaCegarLoop]: trace histogram [291, 285, 236, 147, 147, 147, 147, 143, 143, 143, 143, 143, 142, 142, 141, 141, 89, 55, 1, 1, 1, 1] [2022-11-16 20:10:26,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:26,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:26,446 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:10:26,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:26,446 INFO L85 PathProgramCache]: Analyzing trace with hash -356535675, now seen corresponding path program 16 times [2022-11-16 20:10:26,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:26,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056677997] [2022-11-16 20:10:26,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:26,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:40,059 INFO L134 CoverageAnalysis]: Checked inductivity of 295757 backedges. 7091 proven. 25645 refuted. 0 times theorem prover too weak. 263021 trivial. 0 not checked. [2022-11-16 20:10:40,060 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:40,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056677997] [2022-11-16 20:10:40,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056677997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:40,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684788218] [2022-11-16 20:10:40,060 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:10:40,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:40,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:40,063 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:40,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 20:10:41,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:41,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 5249 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 20:10:41,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:41,874 INFO L134 CoverageAnalysis]: Checked inductivity of 295757 backedges. 113960 proven. 19810 refuted. 0 times theorem prover too weak. 161987 trivial. 0 not checked. [2022-11-16 20:10:41,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:10:48,875 INFO L134 CoverageAnalysis]: Checked inductivity of 295757 backedges. 8604 proven. 28958 refuted. 0 times theorem prover too weak. 258195 trivial. 0 not checked. [2022-11-16 20:10:48,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684788218] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:10:48,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641635483] [2022-11-16 20:10:48,877 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:10:48,877 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:10:48,878 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) [2022-11-16 20:10:48,879 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:10:48,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 34] total 39 [2022-11-16 20:10:48,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625085337] [2022-11-16 20:10:48,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:10:48,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 20:10:48,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:48,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 20:10:48,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1264, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:10:48,885 INFO L87 Difference]: Start difference. First operand 174 states and 224 transitions. Second operand has 39 states, 39 states have (on average 5.897435897435898) internal successors, (230), 39 states have internal predecessors, (230), 34 states have call successors, (41), 7 states have call predecessors, (41), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2022-11-16 20:10:50,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:50,143 INFO L93 Difference]: Finished difference Result 416 states and 582 transitions. [2022-11-16 20:10:50,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-16 20:10:50,144 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 5.897435897435898) internal successors, (230), 39 states have internal predecessors, (230), 34 states have call successors, (41), 7 states have call predecessors, (41), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) Word has length 2829 [2022-11-16 20:10:50,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:50,148 INFO L225 Difference]: With dead ends: 416 [2022-11-16 20:10:50,148 INFO L226 Difference]: Without dead ends: 247 [2022-11-16 20:10:50,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5736 GetRequests, 5634 SyntacticMatches, 24 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1706 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1615, Invalid=4705, Unknown=0, NotChecked=0, Total=6320 [2022-11-16 20:10:50,151 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 1176 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 489 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1176 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 489 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:50,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1176 Valid, 146 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [489 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:10:50,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-11-16 20:10:50,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 187. [2022-11-16 20:10:50,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 150 states have (on average 1.02) internal successors, (153), 149 states have internal predecessors, (153), 25 states have call successors, (25), 18 states have call predecessors, (25), 11 states have return successors, (68), 19 states have call predecessors, (68), 24 states have call successors, (68) [2022-11-16 20:10:50,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 246 transitions. [2022-11-16 20:10:50,166 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 246 transitions. Word has length 2829 [2022-11-16 20:10:50,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:50,168 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 246 transitions. [2022-11-16 20:10:50,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 5.897435897435898) internal successors, (230), 39 states have internal predecessors, (230), 34 states have call successors, (41), 7 states have call predecessors, (41), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2022-11-16 20:10:50,168 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 246 transitions. [2022-11-16 20:10:50,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1738 [2022-11-16 20:10:50,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:50,193 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, 1] [2022-11-16 20:10:50,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:50,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-16 20:10:50,412 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:10:50,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:50,412 INFO L85 PathProgramCache]: Analyzing trace with hash 600727748, now seen corresponding path program 17 times [2022-11-16 20:10:50,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:50,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575101327] [2022-11-16 20:10:50,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:50,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:50,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:17,730 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18642 proven. 26756 refuted. 0 times theorem prover too weak. 65661 trivial. 0 not checked. [2022-11-16 20:12:17,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:17,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575101327] [2022-11-16 20:12:17,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575101327] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:17,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494886115] [2022-11-16 20:12:17,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:12:17,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:17,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:17,739 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:17,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 20:12:19,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 128 check-sat command(s) [2022-11-16 20:12:19,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:12:19,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 3215 conjuncts, 353 conjunts are in the unsatisfiable core [2022-11-16 20:12:19,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:21,697 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18335 proven. 20467 refuted. 0 times theorem prover too weak. 72257 trivial. 0 not checked. [2022-11-16 20:12:21,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:14:24,394 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 20425 proven. 19582 refuted. 0 times theorem prover too weak. 71052 trivial. 0 not checked. [2022-11-16 20:14:24,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494886115] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:14:24,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35667111] [2022-11-16 20:14:24,396 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:14:24,396 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:14:24,397 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) [2022-11-16 20:14:24,397 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:14:24,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 47] total 66 [2022-11-16 20:14:24,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304934068] [2022-11-16 20:14:24,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:14:24,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-16 20:14:24,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:14:24,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-16 20:14:24,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=3470, Unknown=0, NotChecked=0, Total=4422 [2022-11-16 20:14:24,402 INFO L87 Difference]: Start difference. First operand 187 states and 246 transitions. Second operand has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 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) [2022-11-16 20:14:24,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:14:24,736 INFO L93 Difference]: Finished difference Result 218 states and 304 transitions. [2022-11-16 20:14:24,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 20:14:24,736 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 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 1737 [2022-11-16 20:14:24,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:14:24,740 INFO L225 Difference]: With dead ends: 218 [2022-11-16 20:14:24,740 INFO L226 Difference]: Without dead ends: 217 [2022-11-16 20:14:24,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3829 GetRequests, 3488 SyntacticMatches, 272 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13246 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1063, Invalid=3907, Unknown=0, NotChecked=0, Total=4970 [2022-11-16 20:14:24,742 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 76 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:14:24,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 201 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:14:24,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-11-16 20:14:24,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 207. [2022-11-16 20:14:24,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 164 states have internal predecessors, (169), 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) [2022-11-16 20:14:24,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 290 transitions. [2022-11-16 20:14:24,789 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 290 transitions. Word has length 1737 [2022-11-16 20:14:24,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:14:24,791 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 290 transitions. [2022-11-16 20:14:24,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 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) [2022-11-16 20:14:24,792 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 290 transitions. [2022-11-16 20:14:24,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5249 [2022-11-16 20:14:24,935 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:14:24,936 INFO L195 NwaCegarLoop]: trace histogram [538, 531, 436, 271, 271, 271, 271, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1, 1] [2022-11-16 20:14:24,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-16 20:14:25,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-16 20:14:25,136 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:14:25,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:14:25,137 INFO L85 PathProgramCache]: Analyzing trace with hash -536137792, now seen corresponding path program 18 times [2022-11-16 20:14:25,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:14:25,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226241679] [2022-11-16 20:14:25,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:14:25,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:14:26,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:09,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1020577 backedges. 13456 proven. 57466 refuted. 0 times theorem prover too weak. 949655 trivial. 0 not checked. [2022-11-16 20:15:09,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:09,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226241679] [2022-11-16 20:15:09,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226241679] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:09,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656109349] [2022-11-16 20:15:09,719 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:09,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:09,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:09,720 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:09,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 20:15:12,293 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:12,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:12,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 6496 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-16 20:15:12,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1020577 backedges. 468067 proven. 36758 refuted. 0 times theorem prover too weak. 515752 trivial. 0 not checked. [2022-11-16 20:15:12,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:25,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1020577 backedges. 16154 proven. 63929 refuted. 0 times theorem prover too weak. 940494 trivial. 0 not checked. [2022-11-16 20:15:25,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656109349] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:25,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634871670] [2022-11-16 20:15:25,097 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:25,098 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:25,098 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) [2022-11-16 20:15:25,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:25,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 38] total 43 [2022-11-16 20:15:25,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892348693] [2022-11-16 20:15:25,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:25,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-16 20:15:25,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:25,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-16 20:15:25,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1547, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 20:15:25,108 INFO L87 Difference]: Start difference. First operand 207 states and 290 transitions. Second operand has 43 states, 43 states have (on average 5.906976744186046) internal successors, (254), 43 states have internal predecessors, (254), 38 states have call successors, (45), 7 states have call predecessors, (45), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2022-11-16 20:15:26,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:26,959 INFO L93 Difference]: Finished difference Result 523 states and 797 transitions. [2022-11-16 20:15:26,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-16 20:15:26,959 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.906976744186046) internal successors, (254), 43 states have internal predecessors, (254), 38 states have call successors, (45), 7 states have call predecessors, (45), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) Word has length 5248 [2022-11-16 20:15:26,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:26,964 INFO L225 Difference]: With dead ends: 523 [2022-11-16 20:15:26,964 INFO L226 Difference]: Without dead ends: 321 [2022-11-16 20:15:26,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10594 GetRequests, 10471 SyntacticMatches, 26 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2733 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2400, Invalid=7302, Unknown=0, NotChecked=0, Total=9702 [2022-11-16 20:15:26,969 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 1313 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 616 mSolverCounterSat, 776 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1313 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 1392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 776 IncrementalHoareTripleChecker+Valid, 616 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:26,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1313 Valid, 191 Invalid, 1392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [776 Valid, 616 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 20:15:26,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2022-11-16 20:15:26,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 263. [2022-11-16 20:15:26,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 213 states have (on average 1.0234741784037558) internal successors, (218), 209 states have internal predecessors, (218), 35 states have call successors, (35), 26 states have call predecessors, (35), 14 states have return successors, (112), 27 states have call predecessors, (112), 34 states have call successors, (112) [2022-11-16 20:15:26,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 365 transitions. [2022-11-16 20:15:26,989 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 365 transitions. Word has length 5248 [2022-11-16 20:15:26,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:26,991 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 365 transitions. [2022-11-16 20:15:26,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.906976744186046) internal successors, (254), 43 states have internal predecessors, (254), 38 states have call successors, (45), 7 states have call predecessors, (45), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2022-11-16 20:15:26,991 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 365 transitions. [2022-11-16 20:15:27,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3478 [2022-11-16 20:15:27,057 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:27,057 INFO L195 NwaCegarLoop]: trace histogram [355, 354, 287, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 176, 176, 110, 68, 1, 1, 1, 1] [2022-11-16 20:15:27,075 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-16 20:15:27,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:27,258 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:15:27,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:27,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1681715119, now seen corresponding path program 19 times [2022-11-16 20:15:27,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:27,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768187721] [2022-11-16 20:15:27,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:27,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:27,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 15360 proven. 36406 refuted. 0 times theorem prover too weak. 395491 trivial. 0 not checked. [2022-11-16 20:15:45,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:45,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768187721] [2022-11-16 20:15:45,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768187721] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:45,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220367600] [2022-11-16 20:15:45,668 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:45,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:45,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:45,669 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:45,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-16 20:15:48,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:48,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 6450 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 20:15:48,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:48,616 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 205444 proven. 20731 refuted. 0 times theorem prover too weak. 221082 trivial. 0 not checked. [2022-11-16 20:15:48,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:01,108 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 15340 proven. 37961 refuted. 0 times theorem prover too weak. 393956 trivial. 0 not checked. [2022-11-16 20:16:01,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220367600] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:01,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2099252100] [2022-11-16 20:16:01,110 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:01,110 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:01,110 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) [2022-11-16 20:16:01,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:01,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 39] total 44 [2022-11-16 20:16:01,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387669673] [2022-11-16 20:16:01,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:01,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-16 20:16:01,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:01,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-16 20:16:01,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1581, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 20:16:01,116 INFO L87 Difference]: Start difference. First operand 263 states and 365 transitions. Second operand has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2022-11-16 20:16:02,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:02,363 INFO L93 Difference]: Finished difference Result 540 states and 768 transitions. [2022-11-16 20:16:02,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 20:16:02,364 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) Word has length 3477 [2022-11-16 20:16:02,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:02,368 INFO L225 Difference]: With dead ends: 540 [2022-11-16 20:16:02,368 INFO L226 Difference]: Without dead ends: 282 [2022-11-16 20:16:02,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7019 GetRequests, 6931 SyntacticMatches, 19 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1470 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1214, Invalid=3756, Unknown=0, NotChecked=0, Total=4970 [2022-11-16 20:16:02,371 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 558 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 538 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 558 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 538 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:02,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [558 Valid, 337 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [538 Valid, 1101 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 20:16:02,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-11-16 20:16:02,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 210. [2022-11-16 20:16:02,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 169 states have (on average 1.017751479289941) internal successors, (172), 167 states have internal predecessors, (172), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (81), 22 states have call predecessors, (81), 27 states have call successors, (81) [2022-11-16 20:16:02,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 281 transitions. [2022-11-16 20:16:02,395 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 281 transitions. Word has length 3477 [2022-11-16 20:16:02,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:02,396 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 281 transitions. [2022-11-16 20:16:02,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2022-11-16 20:16:02,397 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 281 transitions. [2022-11-16 20:16:02,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3890 [2022-11-16 20:16:02,509 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:02,510 INFO L195 NwaCegarLoop]: trace histogram [397, 396, 321, 198, 198, 198, 198, 198, 198, 198, 198, 198, 198, 198, 197, 197, 123, 76, 1, 1, 1, 1] [2022-11-16 20:16:02,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:02,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-16 20:16:02,723 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:16:02,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:02,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1828444560, now seen corresponding path program 20 times [2022-11-16 20:16:02,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:02,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273669787] [2022-11-16 20:16:02,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:02,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:03,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:26,005 INFO L134 CoverageAnalysis]: Checked inductivity of 559825 backedges. 23167 proven. 36223 refuted. 0 times theorem prover too weak. 500435 trivial. 0 not checked. [2022-11-16 20:16:26,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:26,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273669787] [2022-11-16 20:16:26,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273669787] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:26,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480267281] [2022-11-16 20:16:26,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:16:26,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:26,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:26,007 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:26,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-16 20:16:28,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 80 check-sat command(s) [2022-11-16 20:16:28,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:28,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 2085 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:16:28,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:28,869 INFO L134 CoverageAnalysis]: Checked inductivity of 559825 backedges. 18352 proven. 32721 refuted. 0 times theorem prover too weak. 508752 trivial. 0 not checked. [2022-11-16 20:16:28,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:40,509 INFO L134 CoverageAnalysis]: Checked inductivity of 559825 backedges. 18352 proven. 33018 refuted. 0 times theorem prover too weak. 508455 trivial. 0 not checked. [2022-11-16 20:16:40,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480267281] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:40,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [188632872] [2022-11-16 20:16:40,511 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:40,512 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:40,512 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) [2022-11-16 20:16:40,513 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:40,515 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 21, 35] total 43 [2022-11-16 20:16:40,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859762866] [2022-11-16 20:16:40,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:40,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-16 20:16:40,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:40,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-16 20:16:40,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1493, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 20:16:40,519 INFO L87 Difference]: Start difference. First operand 210 states and 281 transitions. Second operand has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) [2022-11-16 20:16:42,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:42,004 INFO L93 Difference]: Finished difference Result 470 states and 649 transitions. [2022-11-16 20:16:42,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-16 20:16:42,005 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) Word has length 3889 [2022-11-16 20:16:42,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:42,009 INFO L225 Difference]: With dead ends: 470 [2022-11-16 20:16:42,010 INFO L226 Difference]: Without dead ends: 265 [2022-11-16 20:16:42,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7851 GetRequests, 7760 SyntacticMatches, 17 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1611 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1382, Invalid=4318, Unknown=0, NotChecked=0, Total=5700 [2022-11-16 20:16:42,012 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 501 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 1293 mSolverCounterSat, 632 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 1925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 632 IncrementalHoareTripleChecker+Valid, 1293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:42,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [501 Valid, 379 Invalid, 1925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [632 Valid, 1293 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-16 20:16:42,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2022-11-16 20:16:42,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 216. [2022-11-16 20:16:42,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 174 states have (on average 1.0172413793103448) internal successors, (177), 172 states have internal predecessors, (177), 29 states have call successors, (29), 21 states have call predecessors, (29), 12 states have return successors, (83), 22 states have call predecessors, (83), 28 states have call successors, (83) [2022-11-16 20:16:42,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 289 transitions. [2022-11-16 20:16:42,030 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 289 transitions. Word has length 3889 [2022-11-16 20:16:42,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:42,032 INFO L495 AbstractCegarLoop]: Abstraction has 216 states and 289 transitions. [2022-11-16 20:16:42,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) [2022-11-16 20:16:42,033 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 289 transitions. [2022-11-16 20:16:42,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7395 [2022-11-16 20:16:42,432 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:42,434 INFO L195 NwaCegarLoop]: trace histogram [756, 751, 612, 379, 379, 379, 379, 376, 376, 376, 376, 376, 375, 375, 374, 374, 233, 144, 1, 1, 1, 1] [2022-11-16 20:16:42,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-11-16 20:16:42,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:42,634 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:16:42,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:42,636 INFO L85 PathProgramCache]: Analyzing trace with hash 485223344, now seen corresponding path program 21 times [2022-11-16 20:16:42,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:42,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796399122] [2022-11-16 20:16:42,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:42,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:44,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:09,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2027890 backedges. 26889 proven. 92959 refuted. 0 times theorem prover too weak. 1908042 trivial. 0 not checked. [2022-11-16 20:18:09,179 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:09,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796399122] [2022-11-16 20:18:09,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796399122] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:09,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023274841] [2022-11-16 20:18:09,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:18:09,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:09,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:09,183 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:09,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-16 20:18:12,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:18:12,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:18:12,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 9146 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-16 20:18:12,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:12,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2027890 backedges. 760012 proven. 69268 refuted. 0 times theorem prover too weak. 1198610 trivial. 0 not checked. [2022-11-16 20:18:12,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:31,490 INFO L134 CoverageAnalysis]: Checked inductivity of 2027890 backedges. 31607 proven. 101258 refuted. 0 times theorem prover too weak. 1895025 trivial. 0 not checked. [2022-11-16 20:18:31,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023274841] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:31,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764807707] [2022-11-16 20:18:31,494 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:18:31,494 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:18:31,494 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) [2022-11-16 20:18:31,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:31,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 44] total 49 [2022-11-16 20:18:31,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176695141] [2022-11-16 20:18:31,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:31,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-16 20:18:31,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:31,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-16 20:18:31,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=2017, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 20:18:31,505 INFO L87 Difference]: Start difference. First operand 216 states and 289 transitions. Second operand has 49 states, 49 states have (on average 5.959183673469388) internal successors, (292), 49 states have internal predecessors, (292), 44 states have call successors, (51), 5 states have call predecessors, (51), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) [2022-11-16 20:18:34,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:34,002 INFO L93 Difference]: Finished difference Result 578 states and 829 transitions. [2022-11-16 20:18:34,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-16 20:18:34,003 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 5.959183673469388) internal successors, (292), 49 states have internal predecessors, (292), 44 states have call successors, (51), 5 states have call predecessors, (51), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) Word has length 7394 [2022-11-16 20:18:34,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:34,009 INFO L225 Difference]: With dead ends: 578 [2022-11-16 20:18:34,009 INFO L226 Difference]: Without dead ends: 367 [2022-11-16 20:18:34,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14908 GetRequests, 14760 SyntacticMatches, 26 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4387 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3419, Invalid=11833, Unknown=0, NotChecked=0, Total=15252 [2022-11-16 20:18:34,014 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 2049 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 1207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2049 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 2023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1207 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:34,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2049 Valid, 230 Invalid, 2023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1207 Valid, 816 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-16 20:18:34,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2022-11-16 20:18:34,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 229. [2022-11-16 20:18:34,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 184 states have (on average 1.016304347826087) internal successors, (187), 183 states have internal predecessors, (187), 31 states have call successors, (31), 22 states have call predecessors, (31), 13 states have return successors, (95), 23 states have call predecessors, (95), 30 states have call successors, (95) [2022-11-16 20:18:34,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2022-11-16 20:18:34,045 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 7394 [2022-11-16 20:18:34,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:34,047 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2022-11-16 20:18:34,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 5.959183673469388) internal successors, (292), 49 states have internal predecessors, (292), 44 states have call successors, (51), 5 states have call predecessors, (51), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) [2022-11-16 20:18:34,048 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2022-11-16 20:18:34,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4563 [2022-11-16 20:18:34,170 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:34,171 INFO L195 NwaCegarLoop]: trace histogram [466, 464, 377, 233, 233, 233, 233, 232, 232, 232, 232, 232, 232, 232, 231, 231, 144, 89, 1, 1, 1, 1] [2022-11-16 20:18:34,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:34,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8387aabf-933e-46a2-b29a-c7dbdc82ea74/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:34,372 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2022-11-16 20:18:34,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:34,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1835066212, now seen corresponding path program 22 times [2022-11-16 20:18:34,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:34,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058339291] [2022-11-16 20:18:34,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:34,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:35,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat