./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:57:50,273 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:57:50,275 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:57:50,334 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:57:50,335 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:57:50,341 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:57:50,343 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:57:50,348 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:57:50,351 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:57:50,360 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:57:50,361 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:57:50,364 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:57:50,364 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:57:50,368 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:57:50,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:57:50,376 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:57:50,378 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:57:50,379 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:57:50,382 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:57:50,390 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:57:50,393 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:57:50,395 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:57:50,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:57:50,400 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:57:50,407 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:57:50,408 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:57:50,409 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:57:50,411 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:57:50,412 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:57:50,414 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:57:50,414 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:57:50,415 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:57:50,418 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:57:50,419 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:57:50,421 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:57:50,422 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:57:50,422 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:57:50,423 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:57:50,423 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:57:50,424 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:57:50,425 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:57:50,426 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/config/svcomp-Overflow-64bit-Taipan_Default.epf [2021-11-21 00:57:50,476 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:57:50,476 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:57:50,477 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:57:50,477 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:57:50,484 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:57:50,485 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:57:50,485 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:57:50,485 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:57:50,485 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:57:50,486 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:57:50,487 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:57:50,487 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:57:50,487 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:57:50,487 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:57:50,488 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:57:50,488 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:57:50,488 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:57:50,488 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:57:50,489 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:57:50,489 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:57:50,490 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:57:50,490 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:57:50,490 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:57:50,490 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:57:50,491 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:57:50,491 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-21 00:57:50,491 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:57:50,491 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:57:50,492 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:57:50,492 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:57:50,492 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:57:50,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:57:50,493 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:57:50,493 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:57:50,493 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:57:50,494 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:57:50,494 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:57:50,494 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:57:50,494 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:57:50,495 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:57:50,495 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 [2021-11-21 00:57:50,760 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:57:50,781 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:57:50,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:57:50,786 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:57:50,787 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:57:50,788 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-21 00:57:50,859 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/data/3c6252e7f/7931039e5bd54d8c93152710f828026e/FLAG490f346f4 [2021-11-21 00:57:51,341 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:57:51,342 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-21 00:57:51,355 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/data/3c6252e7f/7931039e5bd54d8c93152710f828026e/FLAG490f346f4 [2021-11-21 00:57:51,711 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/data/3c6252e7f/7931039e5bd54d8c93152710f828026e [2021-11-21 00:57:51,714 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:57:51,717 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:57:51,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:57:51,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:57:51,732 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:57:51,732 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:51,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5abd7b5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51, skipping insertion in model container [2021-11-21 00:57:51,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:51,753 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:57:51,780 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:57:51,957 WARN L230 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_18f2696a-7db5-4388-9561-40f322c3f58b/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-21 00:57:51,958 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:57:51,967 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:57:51,982 WARN L230 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_18f2696a-7db5-4388-9561-40f322c3f58b/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-21 00:57:51,983 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:57:51,997 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:57:51,997 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51 WrapperNode [2021-11-21 00:57:51,997 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:57:51,999 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:57:51,999 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:57:51,999 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:57:52,007 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,014 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,031 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 26 [2021-11-21 00:57:52,032 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:57:52,033 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:57:52,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:57:52,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:57:52,042 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,044 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,044 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,047 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,050 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,052 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:57:52,053 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:57:52,053 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:57:52,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:57:52,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (1/1) ... [2021-11-21 00:57:52,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:57:52,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:52,104 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:57:52,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:57:52,161 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-21 00:57:52,162 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-21 00:57:52,162 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:57:52,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:57:52,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:57:52,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:57:52,230 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:57:52,232 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:57:52,387 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:57:52,406 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:57:52,406 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-21 00:57:52,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:57:52 BoogieIcfgContainer [2021-11-21 00:57:52,409 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:57:52,411 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:57:52,411 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:57:52,415 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:57:52,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:57:51" (1/3) ... [2021-11-21 00:57:52,416 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@309c8334 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:57:52, skipping insertion in model container [2021-11-21 00:57:52,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:57:51" (2/3) ... [2021-11-21 00:57:52,417 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@309c8334 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:57:52, skipping insertion in model container [2021-11-21 00:57:52,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:57:52" (3/3) ... [2021-11-21 00:57:52,419 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-2.c [2021-11-21 00:57:52,425 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:57:52,425 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-21 00:57:52,478 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:57:52,485 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:57:52,486 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-21 00:57:52,503 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:57:52,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:57:52,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:52,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:52,510 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:52,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:52,517 INFO L85 PathProgramCache]: Analyzing trace with hash 1639303625, now seen corresponding path program 1 times [2021-11-21 00:57:52,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:52,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363236714] [2021-11-21 00:57:52,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:52,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:52,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:52,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:57:52,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:52,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363236714] [2021-11-21 00:57:52,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363236714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:52,713 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:57:52,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:57:52,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674692915] [2021-11-21 00:57:52,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:52,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:57:52,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:52,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:57:52,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:52,750 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:57:52,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:52,852 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-21 00:57:52,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:57:52,855 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 00:57:52,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:52,863 INFO L225 Difference]: With dead ends: 27 [2021-11-21 00:57:52,864 INFO L226 Difference]: Without dead ends: 22 [2021-11-21 00:57:52,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:57:52,871 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:52,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:57:52,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-21 00:57:52,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-21 00:57:52,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:57:52,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-21 00:57:52,913 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 7 [2021-11-21 00:57:52,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:52,913 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-21 00:57:52,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:57:52,914 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-21 00:57:52,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:57:52,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:52,915 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:52,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:57:52,916 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:52,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:52,917 INFO L85 PathProgramCache]: Analyzing trace with hash -721195135, now seen corresponding path program 1 times [2021-11-21 00:57:52,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:52,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521232063] [2021-11-21 00:57:52,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:52,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:52,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:52,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:57:52,949 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:52,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521232063] [2021-11-21 00:57:52,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521232063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:52,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:57:52,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:57:52,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110818070] [2021-11-21 00:57:52,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:52,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:57:52,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:52,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:57:52,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:57:52,953 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:57:52,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:52,974 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-21 00:57:52,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:57:52,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:57:52,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:52,977 INFO L225 Difference]: With dead ends: 24 [2021-11-21 00:57:52,977 INFO L226 Difference]: Without dead ends: 22 [2021-11-21 00:57:52,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:57:52,980 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:52,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 24 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:57:52,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-21 00:57:52,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-11-21 00:57:52,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:57:52,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-21 00:57:52,990 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 8 [2021-11-21 00:57:52,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:52,991 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-21 00:57:52,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:57:52,991 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-21 00:57:52,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:57:52,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:52,993 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:52,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:57:52,994 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:52,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:52,994 INFO L85 PathProgramCache]: Analyzing trace with hash -793689855, now seen corresponding path program 1 times [2021-11-21 00:57:52,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:52,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710493952] [2021-11-21 00:57:52,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:52,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:53,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:53,097 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:57:53,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:53,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710493952] [2021-11-21 00:57:53,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710493952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:53,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:57:53,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:57:53,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613387502] [2021-11-21 00:57:53,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:53,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:57:53,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:53,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:57:53,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:53,101 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:57:53,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:53,166 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-21 00:57:53,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:57:53,167 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-21 00:57:53,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:53,169 INFO L225 Difference]: With dead ends: 36 [2021-11-21 00:57:53,169 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 00:57:53,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:53,172 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:53,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:57:53,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 00:57:53,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-21 00:57:53,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-21 00:57:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-21 00:57:53,189 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2021-11-21 00:57:53,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:53,190 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-21 00:57:53,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:57:53,190 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-21 00:57:53,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:57:53,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:53,192 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:53,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:57:53,193 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:53,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:53,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1176736919, now seen corresponding path program 1 times [2021-11-21 00:57:53,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:53,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064540115] [2021-11-21 00:57:53,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:53,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:53,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:53,339 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:53,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:53,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064540115] [2021-11-21 00:57:53,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064540115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:53,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783903629] [2021-11-21 00:57:53,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:53,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:53,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:53,349 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:53,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:57:53,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:53,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:57:53,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:53,618 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:57:53,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:53,902 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:57:53,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783903629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:57:53,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595591263] [2021-11-21 00:57:53,923 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 00:57:53,923 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:53,928 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:57:53,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:57:53,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-21 00:57:53,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595401583] [2021-11-21 00:57:53,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:53,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 00:57:53,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:53,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 00:57:53,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:57:53,933 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-21 00:57:54,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:54,322 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-21 00:57:54,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:57:54,324 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2021-11-21 00:57:54,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:54,329 INFO L225 Difference]: With dead ends: 90 [2021-11-21 00:57:54,329 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 00:57:54,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:57:54,336 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 121 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:54,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 67 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:57:54,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 00:57:54,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-21 00:57:54,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 00:57:54,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-21 00:57:54,354 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 24 [2021-11-21 00:57:54,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:54,355 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-21 00:57:54,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-21 00:57:54,356 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-21 00:57:54,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 00:57:54,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:54,358 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:54,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:54,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:54,572 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:54,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:54,573 INFO L85 PathProgramCache]: Analyzing trace with hash -1851648215, now seen corresponding path program 2 times [2021-11-21 00:57:54,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:54,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619880162] [2021-11-21 00:57:54,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:54,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:54,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:54,637 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:54,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619880162] [2021-11-21 00:57:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619880162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895596317] [2021-11-21 00:57:54,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:57:54,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:54,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:54,640 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:54,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:57:54,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:57:54,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:57:54,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:57:54,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:54,761 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:54,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:57:54,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895596317] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:54,762 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:57:54,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-21 00:57:54,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447836056] [2021-11-21 00:57:54,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:54,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:57:54,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:54,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:57:54,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:57:54,764 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) [2021-11-21 00:57:54,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:54,792 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-21 00:57:54,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:57:54,793 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 [2021-11-21 00:57:54,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:54,795 INFO L225 Difference]: With dead ends: 60 [2021-11-21 00:57:54,795 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 00:57:54,796 INFO L932 BasicCegarLoop]: 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 [2021-11-21 00:57:54,797 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 57 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 [2021-11-21 00:57:54,797 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:57:54,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 00:57:54,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-21 00:57:54,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 00:57:54,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-21 00:57:54,823 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2021-11-21 00:57:54,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:54,824 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-21 00:57:54,824 INFO L471 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) [2021-11-21 00:57:54,824 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-21 00:57:54,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 00:57:54,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:54,826 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:54,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:55,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:55,050 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:55,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:55,051 INFO L85 PathProgramCache]: Analyzing trace with hash -1566519763, now seen corresponding path program 1 times [2021-11-21 00:57:55,051 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:55,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671639780] [2021-11-21 00:57:55,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:55,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:55,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:55,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:55,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:55,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671639780] [2021-11-21 00:57:55,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671639780] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:55,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332111562] [2021-11-21 00:57:55,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:55,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:55,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:55,171 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:55,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:57:55,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:55,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:57:55,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:55,312 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:55,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:57:55,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1332111562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:57:55,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [42956299] [2021-11-21 00:57:55,408 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:57:55,409 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:55,410 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:57:55,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:57:55,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-21 00:57:55,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532614369] [2021-11-21 00:57:55,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:55,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:57:55,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:55,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:57:55,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:57:55,417 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-21 00:57:55,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:55,544 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-21 00:57:55,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:57:55,545 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 25 [2021-11-21 00:57:55,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:55,553 INFO L225 Difference]: With dead ends: 69 [2021-11-21 00:57:55,553 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 00:57:55,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:57:55,557 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:55,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 138 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:57:55,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 00:57:55,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-21 00:57:55,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2021-11-21 00:57:55,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-21 00:57:55,589 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 25 [2021-11-21 00:57:55,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:55,590 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-21 00:57:55,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-21 00:57:55,590 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-21 00:57:55,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:57:55,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:55,594 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:55,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:55,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:55,807 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:55,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:55,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1666040976, now seen corresponding path program 1 times [2021-11-21 00:57:55,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:55,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819468354] [2021-11-21 00:57:55,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:55,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:55,919 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 00:57:55,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:55,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819468354] [2021-11-21 00:57:55,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819468354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:55,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763678082] [2021-11-21 00:57:55,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:55,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:55,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:55,922 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:55,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:57:55,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:55,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:57:55,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:56,143 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:57:56,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:57:56,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763678082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:57:56,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1923554576] [2021-11-21 00:57:56,402 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:57:56,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:56,402 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:57:56,403 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:57:56,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-21 00:57:56,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726033595] [2021-11-21 00:57:56,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:56,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:57:56,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:56,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:57:56,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:57:56,410 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-21 00:57:56,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:56,639 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-21 00:57:56,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:57:56,639 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 [2021-11-21 00:57:56,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:56,650 INFO L225 Difference]: With dead ends: 134 [2021-11-21 00:57:56,650 INFO L226 Difference]: Without dead ends: 133 [2021-11-21 00:57:56,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:57:56,655 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 37 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:56,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 172 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:57:56,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-21 00:57:56,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-21 00:57:56,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-21 00:57:56,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-21 00:57:56,685 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 44 [2021-11-21 00:57:56,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:56,685 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-21 00:57:56,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-21 00:57:56,685 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-21 00:57:56,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-21 00:57:56,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:56,688 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-21 00:57:56,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:56,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:57:56,901 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:56,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:56,902 INFO L85 PathProgramCache]: Analyzing trace with hash -94928337, now seen corresponding path program 1 times [2021-11-21 00:57:56,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:56,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019458712] [2021-11-21 00:57:56,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:56,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:56,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:56,984 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-21 00:57:56,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:56,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019458712] [2021-11-21 00:57:56,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019458712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:56,985 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:57:56,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:57:56,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831215088] [2021-11-21 00:57:56,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:56,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:57:56,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:56,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:57:56,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:56,988 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:57:57,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:57,030 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-21 00:57:57,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:57:57,031 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 63 [2021-11-21 00:57:57,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:57,033 INFO L225 Difference]: With dead ends: 111 [2021-11-21 00:57:57,033 INFO L226 Difference]: Without dead ends: 110 [2021-11-21 00:57:57,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:57,035 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:57,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 69 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:57:57,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-21 00:57:57,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-21 00:57:57,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-21 00:57:57,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-21 00:57:57,078 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 63 [2021-11-21 00:57:57,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:57,080 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-21 00:57:57,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:57:57,080 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-21 00:57:57,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:57:57,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:57,083 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 00:57:57,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:57:57,083 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:57,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:57,084 INFO L85 PathProgramCache]: Analyzing trace with hash -631086987, now seen corresponding path program 2 times [2021-11-21 00:57:57,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:57,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975944116] [2021-11-21 00:57:57,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:57,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:57,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:57,162 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 00:57:57,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:57,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975944116] [2021-11-21 00:57:57,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975944116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:57,162 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:57:57,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:57:57,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127255122] [2021-11-21 00:57:57,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:57,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:57:57,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:57,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:57:57,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:57,165 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:57:57,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:57,201 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-21 00:57:57,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:57:57,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 64 [2021-11-21 00:57:57,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:57,204 INFO L225 Difference]: With dead ends: 111 [2021-11-21 00:57:57,204 INFO L226 Difference]: Without dead ends: 110 [2021-11-21 00:57:57,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:57:57,207 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:57,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:57:57,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-21 00:57:57,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-21 00:57:57,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-21 00:57:57,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-21 00:57:57,237 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 64 [2021-11-21 00:57:57,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:57,238 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-21 00:57:57,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 00:57:57,238 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-21 00:57:57,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 00:57:57,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:57,248 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 13, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 7, 7, 6, 4, 1, 1, 1, 1] [2021-11-21 00:57:57,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:57:57,248 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:57,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:57,249 INFO L85 PathProgramCache]: Analyzing trace with hash 868753199, now seen corresponding path program 2 times [2021-11-21 00:57:57,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:57,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055590910] [2021-11-21 00:57:57,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:57,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:57,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:57,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 59 proven. 270 refuted. 0 times theorem prover too weak. 692 trivial. 0 not checked. [2021-11-21 00:57:57,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:57,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055590910] [2021-11-21 00:57:57,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055590910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:57,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289062078] [2021-11-21 00:57:57,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:57:57,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:57,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:57,433 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:57,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:57:57,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 00:57:57,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:57:57,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:57:57,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:57,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 346 proven. 85 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-21 00:57:57,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:58,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1021 backedges. 346 proven. 88 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2021-11-21 00:57:58,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289062078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:57:58,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355298263] [2021-11-21 00:57:58,774 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:57:58,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:58,775 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:57:58,776 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:57:58,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 11] total 18 [2021-11-21 00:57:58,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002275902] [2021-11-21 00:57:58,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:58,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:57:58,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:58,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:57:58,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:57:58,779 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 18 states, 18 states have (on average 5.277777777777778) internal successors, (95), 18 states have internal predecessors, (95), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) [2021-11-21 00:57:59,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:59,158 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2021-11-21 00:57:59,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:57:59,159 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.277777777777778) internal successors, (95), 18 states have internal predecessors, (95), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) Word has length 174 [2021-11-21 00:57:59,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:59,160 INFO L225 Difference]: With dead ends: 175 [2021-11-21 00:57:59,160 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 00:57:59,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:57:59,164 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 303 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:59,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 77 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:57:59,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 00:57:59,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-11-21 00:57:59,169 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) [2021-11-21 00:57:59,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2021-11-21 00:57:59,171 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 174 [2021-11-21 00:57:59,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:59,171 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2021-11-21 00:57:59,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.277777777777778) internal successors, (95), 18 states have internal predecessors, (95), 11 states have call successors, (17), 2 states have call predecessors, (17), 8 states have return successors, (19), 9 states have call predecessors, (19), 11 states have call successors, (19) [2021-11-21 00:57:59,172 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2021-11-21 00:57:59,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-21 00:57:59,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:59,173 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 00:57:59,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:59,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:57:59,387 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:57:59,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:59,387 INFO L85 PathProgramCache]: Analyzing trace with hash 648182430, now seen corresponding path program 3 times [2021-11-21 00:57:59,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:59,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123682355] [2021-11-21 00:57:59,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:59,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:59,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:59,491 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 81 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:57:59,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:59,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123682355] [2021-11-21 00:57:59,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123682355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:59,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871152830] [2021-11-21 00:57:59,492 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:57:59,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:59,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:59,493 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:59,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:57:59,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:57:59,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:57:59,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:57:59,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:59,720 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 123 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-21 00:57:59,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:00,308 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 88 proven. 62 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-21 00:58:00,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871152830] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:00,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243842543] [2021-11-21 00:58:00,311 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:00,311 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:00,311 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:00,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:00,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2021-11-21 00:58:00,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187260245] [2021-11-21 00:58:00,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:00,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:58:00,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:00,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:58:00,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:58:00,314 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) [2021-11-21 00:58:00,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:00,505 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-11-21 00:58:00,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:58:00,506 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 84 [2021-11-21 00:58:00,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:00,506 INFO L225 Difference]: With dead ends: 131 [2021-11-21 00:58:00,506 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 00:58:00,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:58:00,508 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 88 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:00,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 74 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:58:00,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 00:58:00,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-21 00:58:00,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-21 00:58:00,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-21 00:58:00,512 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 84 [2021-11-21 00:58:00,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:00,513 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-21 00:58:00,513 INFO L471 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) [2021-11-21 00:58:00,513 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-21 00:58:00,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-21 00:58:00,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:00,514 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-21 00:58:00,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:00,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:58:00,739 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:00,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:00,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1892098066, now seen corresponding path program 3 times [2021-11-21 00:58:00,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:00,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404363079] [2021-11-21 00:58:00,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:00,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:00,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:00,853 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-21 00:58:00,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:00,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404363079] [2021-11-21 00:58:00,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404363079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:00,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18399950] [2021-11-21 00:58:00,854 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:58:00,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:00,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:00,856 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:00,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:58:00,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:58:00,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:00,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:58:00,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:01,148 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 00:58:01,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:01,424 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 00:58:01,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18399950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:01,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261668321] [2021-11-21 00:58:01,430 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:01,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:01,431 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:01,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:01,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2021-11-21 00:58:01,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7721592] [2021-11-21 00:58:01,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:01,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:58:01,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:01,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:58:01,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:58:01,435 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) [2021-11-21 00:58:01,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:01,549 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-21 00:58:01,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:58:01,549 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 [2021-11-21 00:58:01,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:01,550 INFO L225 Difference]: With dead ends: 68 [2021-11-21 00:58:01,550 INFO L226 Difference]: Without dead ends: 67 [2021-11-21 00:58:01,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:58:01,552 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:01,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 150 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:58:01,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-21 00:58:01,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-21 00:58:01,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-21 00:58:01,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-21 00:58:01,556 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 84 [2021-11-21 00:58:01,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:01,557 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-21 00:58:01,557 INFO L471 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) [2021-11-21 00:58:01,557 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-21 00:58:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2021-11-21 00:58:01,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:01,562 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 20, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 10, 10, 8, 5, 1, 1, 1, 1] [2021-11-21 00:58:01,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:01,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:01,771 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:01,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:01,771 INFO L85 PathProgramCache]: Analyzing trace with hash -335627136, now seen corresponding path program 4 times [2021-11-21 00:58:01,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:01,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549269603] [2021-11-21 00:58:01,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:01,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:01,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 232 proven. 648 refuted. 0 times theorem prover too weak. 1033 trivial. 0 not checked. [2021-11-21 00:58:01,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:01,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549269603] [2021-11-21 00:58:01,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549269603] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:01,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903949824] [2021-11-21 00:58:01,965 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:58:01,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:01,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:01,966 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:01,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:58:02,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:02,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:58:02,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:02,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 893 proven. 533 refuted. 0 times theorem prover too weak. 487 trivial. 0 not checked. [2021-11-21 00:58:02,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 273 proven. 850 refuted. 0 times theorem prover too weak. 790 trivial. 0 not checked. [2021-11-21 00:58:03,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903949824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840049745] [2021-11-21 00:58:03,687 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:03,687 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:03,688 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:03,689 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:03,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 18] total 23 [2021-11-21 00:58:03,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634988987] [2021-11-21 00:58:03,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:03,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:58:03,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:03,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:58:03,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:58:03,692 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-21 00:58:04,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:04,152 INFO L93 Difference]: Finished difference Result 152 states and 184 transitions. [2021-11-21 00:58:04,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:58:04,153 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) Word has length 235 [2021-11-21 00:58:04,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:04,154 INFO L225 Difference]: With dead ends: 152 [2021-11-21 00:58:04,154 INFO L226 Difference]: Without dead ends: 94 [2021-11-21 00:58:04,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 465 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=411, Invalid=1071, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:58:04,156 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 399 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:04,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [399 Valid, 80 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:58:04,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-21 00:58:04,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2021-11-21 00:58:04,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 62 states have internal predecessors, (70), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (17), 10 states have call predecessors, (17), 8 states have call successors, (17) [2021-11-21 00:58:04,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 96 transitions. [2021-11-21 00:58:04,163 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 96 transitions. Word has length 235 [2021-11-21 00:58:04,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:04,164 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 96 transitions. [2021-11-21 00:58:04,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-21 00:58:04,164 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 96 transitions. [2021-11-21 00:58:04,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-21 00:58:04,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:04,166 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-21 00:58:04,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:04,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:04,379 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:04,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:04,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1474206184, now seen corresponding path program 5 times [2021-11-21 00:58:04,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:04,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981174227] [2021-11-21 00:58:04,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:04,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:04,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:04,502 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 164 proven. 168 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 00:58:04,502 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:04,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981174227] [2021-11-21 00:58:04,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981174227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:04,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64703223] [2021-11-21 00:58:04,503 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:58:04,503 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:04,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:04,504 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:04,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:58:04,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-21 00:58:04,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:04,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:58:04,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:04,968 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 61 proven. 90 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-11-21 00:58:04,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:06,012 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 103 proven. 90 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-21 00:58:06,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64703223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:06,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044941539] [2021-11-21 00:58:06,016 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:06,016 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:06,017 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:06,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:06,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15] total 35 [2021-11-21 00:58:06,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775239679] [2021-11-21 00:58:06,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:06,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 00:58:06,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:06,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 00:58:06,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:58:06,023 INFO L87 Difference]: Start difference. First operand 81 states and 96 transitions. Second operand has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2021-11-21 00:58:07,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:07,086 INFO L93 Difference]: Finished difference Result 189 states and 252 transitions. [2021-11-21 00:58:07,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 00:58:07,087 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) Word has length 128 [2021-11-21 00:58:07,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:07,089 INFO L225 Difference]: With dead ends: 189 [2021-11-21 00:58:07,089 INFO L226 Difference]: Without dead ends: 113 [2021-11-21 00:58:07,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=662, Invalid=3120, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 00:58:07,092 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 237 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 882 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 1068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 882 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:07,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 120 Invalid, 1068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 882 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:58:07,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-21 00:58:07,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2021-11-21 00:58:07,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 72 states have internal predecessors, (77), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (25), 12 states have call predecessors, (25), 10 states have call successors, (25) [2021-11-21 00:58:07,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2021-11-21 00:58:07,102 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 128 [2021-11-21 00:58:07,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:07,102 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2021-11-21 00:58:07,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2021-11-21 00:58:07,103 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2021-11-21 00:58:07,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-21 00:58:07,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:07,109 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2021-11-21 00:58:07,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:07,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:58:07,335 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:07,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:07,335 INFO L85 PathProgramCache]: Analyzing trace with hash -416206161, now seen corresponding path program 6 times [2021-11-21 00:58:07,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:07,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543365827] [2021-11-21 00:58:07,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:07,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:07,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:07,591 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 470 proven. 1076 refuted. 0 times theorem prover too weak. 1590 trivial. 0 not checked. [2021-11-21 00:58:07,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:07,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543365827] [2021-11-21 00:58:07,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543365827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:07,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053471546] [2021-11-21 00:58:07,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:58:07,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:07,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:07,595 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:07,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:58:07,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:58:07,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:07,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 00:58:07,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:08,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 555 proven. 1181 refuted. 0 times theorem prover too weak. 1400 trivial. 0 not checked. [2021-11-21 00:58:08,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:10,118 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 555 proven. 1253 refuted. 0 times theorem prover too weak. 1328 trivial. 0 not checked. [2021-11-21 00:58:10,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053471546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:10,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501076419] [2021-11-21 00:58:10,123 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:10,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:10,124 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:10,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:10,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-21 00:58:10,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886488831] [2021-11-21 00:58:10,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:10,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:58:10,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:10,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:58:10,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:58:10,130 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-21 00:58:10,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:10,770 INFO L93 Difference]: Finished difference Result 220 states and 289 transitions. [2021-11-21 00:58:10,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 00:58:10,771 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 299 [2021-11-21 00:58:10,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:10,776 INFO L225 Difference]: With dead ends: 220 [2021-11-21 00:58:10,776 INFO L226 Difference]: Without dead ends: 132 [2021-11-21 00:58:10,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 641 GetRequests, 592 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=604, Invalid=1748, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 00:58:10,782 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 427 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:10,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [427 Valid, 131 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [284 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:58:10,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-21 00:58:10,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 119. [2021-11-21 00:58:10,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 92 states have internal predecessors, (101), 14 states have call successors, (14), 11 states have call predecessors, (14), 8 states have return successors, (32), 15 states have call predecessors, (32), 13 states have call successors, (32) [2021-11-21 00:58:10,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 147 transitions. [2021-11-21 00:58:10,792 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 147 transitions. Word has length 299 [2021-11-21 00:58:10,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:10,793 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 147 transitions. [2021-11-21 00:58:10,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-21 00:58:10,793 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 147 transitions. [2021-11-21 00:58:10,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-21 00:58:10,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:10,798 INFO L514 BasicCegarLoop]: trace histogram [28, 26, 23, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 12, 9, 5, 1, 1, 1, 1] [2021-11-21 00:58:10,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:11,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:58:11,012 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:11,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:11,012 INFO L85 PathProgramCache]: Analyzing trace with hash -637953375, now seen corresponding path program 7 times [2021-11-21 00:58:11,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:11,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664886985] [2021-11-21 00:58:11,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:11,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:11,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 574 proven. 350 refuted. 0 times theorem prover too weak. 1542 trivial. 0 not checked. [2021-11-21 00:58:11,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:11,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664886985] [2021-11-21 00:58:11,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664886985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:11,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523771207] [2021-11-21 00:58:11,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:58:11,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:11,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:11,165 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:11,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:58:11,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:11,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:58:11,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:11,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 1242 proven. 484 refuted. 0 times theorem prover too weak. 740 trivial. 0 not checked. [2021-11-21 00:58:11,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:13,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 534 proven. 831 refuted. 0 times theorem prover too weak. 1101 trivial. 0 not checked. [2021-11-21 00:58:13,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523771207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:13,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764068192] [2021-11-21 00:58:13,402 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:13,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:13,402 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:13,403 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:13,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 24 [2021-11-21 00:58:13,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882208020] [2021-11-21 00:58:13,404 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:13,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:58:13,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:13,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:58:13,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-21 00:58:13,406 INFO L87 Difference]: Start difference. First operand 119 states and 147 transitions. Second operand has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-21 00:58:13,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:13,784 INFO L93 Difference]: Finished difference Result 231 states and 296 transitions. [2021-11-21 00:58:13,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:58:13,785 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) Word has length 266 [2021-11-21 00:58:13,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:13,787 INFO L225 Difference]: With dead ends: 231 [2021-11-21 00:58:13,787 INFO L226 Difference]: Without dead ends: 117 [2021-11-21 00:58:13,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 522 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:58:13,789 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 216 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:13,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 147 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:58:13,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-21 00:58:13,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 105. [2021-11-21 00:58:13,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 82 states have internal predecessors, (87), 13 states have call successors, (13), 10 states have call predecessors, (13), 7 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-11-21 00:58:13,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 126 transitions. [2021-11-21 00:58:13,797 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 126 transitions. Word has length 266 [2021-11-21 00:58:13,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:13,798 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 126 transitions. [2021-11-21 00:58:13,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-21 00:58:13,799 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 126 transitions. [2021-11-21 00:58:13,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 752 [2021-11-21 00:58:13,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:13,820 INFO L514 BasicCegarLoop]: trace histogram [78, 75, 63, 39, 39, 39, 39, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2021-11-21 00:58:13,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:14,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:58:14,035 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:14,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:14,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1449401034, now seen corresponding path program 8 times [2021-11-21 00:58:14,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:14,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161244246] [2021-11-21 00:58:14,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:14,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:14,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:14,398 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 1183 proven. 4435 refuted. 0 times theorem prover too weak. 14888 trivial. 0 not checked. [2021-11-21 00:58:14,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:14,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161244246] [2021-11-21 00:58:14,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161244246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:14,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258709227] [2021-11-21 00:58:14,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:58:14,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:14,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:14,400 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:14,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:58:14,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-21 00:58:14,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:14,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-21 00:58:14,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 6000 proven. 1712 refuted. 0 times theorem prover too weak. 12794 trivial. 0 not checked. [2021-11-21 00:58:16,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:24,342 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 6467 proven. 1550 refuted. 0 times theorem prover too weak. 12489 trivial. 0 not checked. [2021-11-21 00:58:24,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258709227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:24,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1571096142] [2021-11-21 00:58:24,345 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:24,345 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:24,345 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:24,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:24,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 32] total 56 [2021-11-21 00:58:24,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304546350] [2021-11-21 00:58:24,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:24,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-21 00:58:24,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:24,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-21 00:58:24,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=2675, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:58:24,355 INFO L87 Difference]: Start difference. First operand 105 states and 126 transitions. Second operand has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-21 00:58:26,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:26,776 INFO L93 Difference]: Finished difference Result 324 states and 465 transitions. [2021-11-21 00:58:26,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-21 00:58:26,777 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) Word has length 751 [2021-11-21 00:58:26,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:26,781 INFO L225 Difference]: With dead ends: 324 [2021-11-21 00:58:26,781 INFO L226 Difference]: Without dead ends: 224 [2021-11-21 00:58:26,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1592 GetRequests, 1476 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4417 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2014, Invalid=11792, Unknown=0, NotChecked=0, Total=13806 [2021-11-21 00:58:26,790 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 501 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 1194 mSolverCounterSat, 356 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 356 IncrementalHoareTripleChecker+Valid, 1194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:26,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [501 Valid, 153 Invalid, 1550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [356 Valid, 1194 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:58:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-21 00:58:26,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 191. [2021-11-21 00:58:26,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 149 states have internal predecessors, (158), 23 states have call successors, (23), 14 states have call predecessors, (23), 14 states have return successors, (90), 27 states have call predecessors, (90), 22 states have call successors, (90) [2021-11-21 00:58:26,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 271 transitions. [2021-11-21 00:58:26,810 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 271 transitions. Word has length 751 [2021-11-21 00:58:26,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:26,813 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 271 transitions. [2021-11-21 00:58:26,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-21 00:58:26,814 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 271 transitions. [2021-11-21 00:58:26,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1256 [2021-11-21 00:58:26,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:26,892 INFO L514 BasicCegarLoop]: trace histogram [129, 127, 104, 64, 64, 64, 64, 64, 64, 64, 64, 64, 63, 63, 62, 62, 40, 25, 1, 1, 1, 1] [2021-11-21 00:58:26,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:27,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:58:27,107 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:27,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:27,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1272993134, now seen corresponding path program 9 times [2021-11-21 00:58:27,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:27,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517344243] [2021-11-21 00:58:27,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:27,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:27,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:27,801 INFO L134 CoverageAnalysis]: Checked inductivity of 57779 backedges. 2320 proven. 9501 refuted. 0 times theorem prover too weak. 45958 trivial. 0 not checked. [2021-11-21 00:58:27,801 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:27,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517344243] [2021-11-21 00:58:27,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517344243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:27,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820336211] [2021-11-21 00:58:27,802 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:58:27,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:27,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:27,803 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:27,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:58:28,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:58:28,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:28,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 1561 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 00:58:28,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:30,202 INFO L134 CoverageAnalysis]: Checked inductivity of 57779 backedges. 29196 proven. 5604 refuted. 0 times theorem prover too weak. 22979 trivial. 0 not checked. [2021-11-21 00:58:30,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:34,886 INFO L134 CoverageAnalysis]: Checked inductivity of 57779 backedges. 2832 proven. 10977 refuted. 0 times theorem prover too weak. 43970 trivial. 0 not checked. [2021-11-21 00:58:34,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820336211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:34,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480339219] [2021-11-21 00:58:34,889 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:34,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:34,890 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:34,892 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:34,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 30] total 35 [2021-11-21 00:58:34,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821080871] [2021-11-21 00:58:34,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:34,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 00:58:34,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:34,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 00:58:34,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1000, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:58:34,898 INFO L87 Difference]: Start difference. First operand 191 states and 271 transitions. Second operand has 35 states, 35 states have (on average 6.0) internal successors, (210), 35 states have internal predecessors, (210), 30 states have call successors, (37), 3 states have call predecessors, (37), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-21 00:58:36,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:36,059 INFO L93 Difference]: Finished difference Result 429 states and 676 transitions. [2021-11-21 00:58:36,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 00:58:36,060 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 6.0) internal successors, (210), 35 states have internal predecessors, (210), 30 states have call successors, (37), 3 states have call predecessors, (37), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) Word has length 1255 [2021-11-21 00:58:36,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:36,065 INFO L225 Difference]: With dead ends: 429 [2021-11-21 00:58:36,066 INFO L226 Difference]: Without dead ends: 243 [2021-11-21 00:58:36,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2576 GetRequests, 2506 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1176, Invalid=3654, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 00:58:36,072 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 891 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 891 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:36,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [891 Valid, 164 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:58:36,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-21 00:58:36,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 223. [2021-11-21 00:58:36,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 180 states have (on average 1.038888888888889) internal successors, (187), 174 states have internal predecessors, (187), 27 states have call successors, (27), 18 states have call predecessors, (27), 15 states have return successors, (92), 30 states have call predecessors, (92), 26 states have call successors, (92) [2021-11-21 00:58:36,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 306 transitions. [2021-11-21 00:58:36,097 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 306 transitions. Word has length 1255 [2021-11-21 00:58:36,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:36,101 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 306 transitions. [2021-11-21 00:58:36,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 6.0) internal successors, (210), 35 states have internal predecessors, (210), 30 states have call successors, (37), 3 states have call predecessors, (37), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-21 00:58:36,101 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 306 transitions. [2021-11-21 00:58:36,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 692 [2021-11-21 00:58:36,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:36,110 INFO L514 BasicCegarLoop]: trace histogram [71, 70, 57, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 34, 34, 22, 14, 1, 1, 1, 1] [2021-11-21 00:58:36,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:36,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:58:36,323 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:36,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:36,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1369382449, now seen corresponding path program 10 times [2021-11-21 00:58:36,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:36,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395666731] [2021-11-21 00:58:36,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:36,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:36,661 INFO L134 CoverageAnalysis]: Checked inductivity of 17312 backedges. 2587 proven. 1205 refuted. 0 times theorem prover too weak. 13520 trivial. 0 not checked. [2021-11-21 00:58:36,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:36,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395666731] [2021-11-21 00:58:36,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395666731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:36,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722450209] [2021-11-21 00:58:36,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:58:36,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:36,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:36,663 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:36,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:58:37,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:37,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 1303 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 00:58:37,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:38,103 INFO L134 CoverageAnalysis]: Checked inductivity of 17312 backedges. 9722 proven. 1214 refuted. 0 times theorem prover too weak. 6376 trivial. 0 not checked. [2021-11-21 00:58:38,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:58:41,521 INFO L134 CoverageAnalysis]: Checked inductivity of 17312 backedges. 1725 proven. 4142 refuted. 0 times theorem prover too weak. 11445 trivial. 0 not checked. [2021-11-21 00:58:41,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722450209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:58:41,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1007342065] [2021-11-21 00:58:41,524 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:58:41,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:58:41,524 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:58:41,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:58:41,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 28 [2021-11-21 00:58:41,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790904456] [2021-11-21 00:58:41,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:58:41,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:58:41,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:58:41,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:58:41,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:58:41,542 INFO L87 Difference]: Start difference. First operand 223 states and 306 transitions. Second operand has 28 states, 28 states have (on average 5.857142857142857) internal successors, (164), 28 states have internal predecessors, (164), 22 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (38), 14 states have call predecessors, (38), 22 states have call successors, (38) [2021-11-21 00:58:42,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:58:42,133 INFO L93 Difference]: Finished difference Result 424 states and 618 transitions. [2021-11-21 00:58:42,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:58:42,134 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.857142857142857) internal successors, (164), 28 states have internal predecessors, (164), 22 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (38), 14 states have call predecessors, (38), 22 states have call successors, (38) Word has length 691 [2021-11-21 00:58:42,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:58:42,140 INFO L225 Difference]: With dead ends: 424 [2021-11-21 00:58:42,140 INFO L226 Difference]: Without dead ends: 206 [2021-11-21 00:58:42,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1415 GetRequests, 1372 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:58:42,144 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 355 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:58:42,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 170 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:58:42,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-21 00:58:42,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 182. [2021-11-21 00:58:42,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 147 states have (on average 1.034013605442177) internal successors, (152), 143 states have internal predecessors, (152), 23 states have call successors, (23), 17 states have call predecessors, (23), 11 states have return successors, (64), 21 states have call predecessors, (64), 22 states have call successors, (64) [2021-11-21 00:58:42,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 239 transitions. [2021-11-21 00:58:42,161 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 239 transitions. Word has length 691 [2021-11-21 00:58:42,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:58:42,162 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 239 transitions. [2021-11-21 00:58:42,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.857142857142857) internal successors, (164), 28 states have internal predecessors, (164), 22 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (38), 14 states have call predecessors, (38), 22 states have call successors, (38) [2021-11-21 00:58:42,163 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 239 transitions. [2021-11-21 00:58:42,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1653 [2021-11-21 00:58:42,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:58:42,187 INFO L514 BasicCegarLoop]: trace histogram [171, 165, 139, 87, 87, 87, 87, 83, 83, 83, 83, 83, 82, 82, 81, 81, 52, 32, 1, 1, 1, 1] [2021-11-21 00:58:42,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:58:42,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:42,405 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:58:42,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:58:42,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1706908399, now seen corresponding path program 11 times [2021-11-21 00:58:42,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:58:42,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111359096] [2021-11-21 00:58:42,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:58:42,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:58:42,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:58:43,273 INFO L134 CoverageAnalysis]: Checked inductivity of 100438 backedges. 4130 proven. 12467 refuted. 0 times theorem prover too weak. 83841 trivial. 0 not checked. [2021-11-21 00:58:43,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:58:43,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111359096] [2021-11-21 00:58:43,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111359096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:58:43,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663157793] [2021-11-21 00:58:43,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:58:43,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:58:43,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:58:43,275 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:58:43,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:58:43,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2021-11-21 00:58:43,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:58:43,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 1854 conjuncts, 197 conjunts are in the unsatisfiable core [2021-11-21 00:58:43,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:58:47,221 INFO L134 CoverageAnalysis]: Checked inductivity of 100438 backedges. 30120 proven. 6401 refuted. 0 times theorem prover too weak. 63917 trivial. 0 not checked. [2021-11-21 00:58:47,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:59:19,161 INFO L134 CoverageAnalysis]: Checked inductivity of 100438 backedges. 31103 proven. 6050 refuted. 0 times theorem prover too weak. 63285 trivial. 0 not checked. [2021-11-21 00:59:19,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663157793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:59:19,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [227482419] [2021-11-21 00:59:19,164 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:59:19,164 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:59:19,164 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:59:19,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:59:19,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 27, 41] total 78 [2021-11-21 00:59:19,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020366582] [2021-11-21 00:59:19,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:59:19,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-21 00:59:19,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:59:19,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-21 00:59:19,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=5213, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 00:59:19,174 INFO L87 Difference]: Start difference. First operand 182 states and 239 transitions. Second operand has 78 states, 78 states have (on average 3.3205128205128207) internal successors, (259), 78 states have internal predecessors, (259), 33 states have call successors, (37), 5 states have call predecessors, (37), 28 states have return successors, (62), 53 states have call predecessors, (62), 29 states have call successors, (62) [2021-11-21 00:59:24,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:59:24,547 INFO L93 Difference]: Finished difference Result 588 states and 970 transitions. [2021-11-21 00:59:24,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-21 00:59:24,548 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.3205128205128207) internal successors, (259), 78 states have internal predecessors, (259), 33 states have call successors, (37), 5 states have call predecessors, (37), 28 states have return successors, (62), 53 states have call predecessors, (62), 29 states have call successors, (62) Word has length 1652 [2021-11-21 00:59:24,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:59:24,555 INFO L225 Difference]: With dead ends: 588 [2021-11-21 00:59:24,556 INFO L226 Difference]: Without dead ends: 411 [2021-11-21 00:59:24,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3456 GetRequests, 3269 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12566 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4945, Invalid=30587, Unknown=0, NotChecked=0, Total=35532 [2021-11-21 00:59:24,567 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 889 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2359 mSolverCounterSat, 836 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 889 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 3195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 836 IncrementalHoareTripleChecker+Valid, 2359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:59:24,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [889 Valid, 181 Invalid, 3195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [836 Valid, 2359 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-21 00:59:24,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-11-21 00:59:24,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 346. [2021-11-21 00:59:24,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 277 states have (on average 1.0252707581227436) internal successors, (284), 271 states have internal predecessors, (284), 42 states have call successors, (42), 22 states have call predecessors, (42), 26 states have return successors, (244), 52 states have call predecessors, (244), 41 states have call successors, (244) [2021-11-21 00:59:24,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 570 transitions. [2021-11-21 00:59:24,600 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 570 transitions. Word has length 1652 [2021-11-21 00:59:24,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:59:24,601 INFO L470 AbstractCegarLoop]: Abstraction has 346 states and 570 transitions. [2021-11-21 00:59:24,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 3.3205128205128207) internal successors, (259), 78 states have internal predecessors, (259), 33 states have call successors, (37), 5 states have call predecessors, (37), 28 states have return successors, (62), 53 states have call predecessors, (62), 29 states have call successors, (62) [2021-11-21 00:59:24,602 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 570 transitions. [2021-11-21 00:59:24,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1797 [2021-11-21 00:59:24,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:59:24,629 INFO L514 BasicCegarLoop]: trace histogram [184, 182, 149, 92, 92, 92, 92, 91, 91, 91, 91, 91, 91, 91, 90, 90, 57, 35, 1, 1, 1, 1] [2021-11-21 00:59:24,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:59:24,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:59:24,843 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:59:24,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:59:24,844 INFO L85 PathProgramCache]: Analyzing trace with hash 922511423, now seen corresponding path program 12 times [2021-11-21 00:59:24,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:59:24,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376716881] [2021-11-21 00:59:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:59:24,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:59:25,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:59:25,946 INFO L134 CoverageAnalysis]: Checked inductivity of 118773 backedges. 8288 proven. 15847 refuted. 0 times theorem prover too weak. 94638 trivial. 0 not checked. [2021-11-21 00:59:25,946 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:59:25,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376716881] [2021-11-21 00:59:25,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376716881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:59:25,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463582495] [2021-11-21 00:59:25,947 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:59:25,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:59:25,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:59:25,948 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:59:25,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:59:26,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:59:26,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:59:26,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 2227 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 00:59:26,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:59:29,578 INFO L134 CoverageAnalysis]: Checked inductivity of 118773 backedges. 54625 proven. 2667 refuted. 0 times theorem prover too weak. 61481 trivial. 0 not checked. [2021-11-21 00:59:29,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:59:37,825 INFO L134 CoverageAnalysis]: Checked inductivity of 118773 backedges. 4744 proven. 16623 refuted. 0 times theorem prover too weak. 97406 trivial. 0 not checked. [2021-11-21 00:59:37,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463582495] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:59:37,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1200267454] [2021-11-21 00:59:37,828 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:59:37,828 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:59:37,828 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:59:37,829 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:59:37,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17, 27] total 34 [2021-11-21 00:59:37,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349473448] [2021-11-21 00:59:37,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:59:37,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 00:59:37,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:59:37,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 00:59:37,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=910, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:59:37,836 INFO L87 Difference]: Start difference. First operand 346 states and 570 transitions. Second operand has 34 states, 34 states have (on average 6.294117647058823) internal successors, (214), 34 states have internal predecessors, (214), 31 states have call successors, (36), 2 states have call predecessors, (36), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) [2021-11-21 00:59:38,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:59:38,809 INFO L93 Difference]: Finished difference Result 617 states and 1205 transitions. [2021-11-21 00:59:38,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 00:59:38,816 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 6.294117647058823) internal successors, (214), 34 states have internal predecessors, (214), 31 states have call successors, (36), 2 states have call predecessors, (36), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) Word has length 1796 [2021-11-21 00:59:38,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:59:38,820 INFO L225 Difference]: With dead ends: 617 [2021-11-21 00:59:38,821 INFO L226 Difference]: Without dead ends: 276 [2021-11-21 00:59:38,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3649 GetRequests, 3592 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=793, Invalid=2399, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:59:38,829 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 518 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 1047 mSolverCounterSat, 488 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 518 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 1535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 488 IncrementalHoareTripleChecker+Valid, 1047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:59:38,830 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [518 Valid, 329 Invalid, 1535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [488 Valid, 1047 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:59:38,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-21 00:59:38,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 189. [2021-11-21 00:59:38,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 152 states have (on average 1.019736842105263) internal successors, (155), 150 states have internal predecessors, (155), 25 states have call successors, (25), 18 states have call predecessors, (25), 11 states have return successors, (71), 20 states have call predecessors, (71), 24 states have call successors, (71) [2021-11-21 00:59:38,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 251 transitions. [2021-11-21 00:59:38,848 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 251 transitions. Word has length 1796 [2021-11-21 00:59:38,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:59:38,849 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 251 transitions. [2021-11-21 00:59:38,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 6.294117647058823) internal successors, (214), 34 states have internal predecessors, (214), 31 states have call successors, (36), 2 states have call predecessors, (36), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) [2021-11-21 00:59:38,849 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 251 transitions. [2021-11-21 00:59:38,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3230 [2021-11-21 00:59:38,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:59:38,925 INFO L514 BasicCegarLoop]: trace histogram [331, 327, 268, 166, 166, 166, 166, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1, 1] [2021-11-21 00:59:38,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:59:39,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-21 00:59:39,139 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:59:39,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:59:39,140 INFO L85 PathProgramCache]: Analyzing trace with hash -2001319598, now seen corresponding path program 13 times [2021-11-21 00:59:39,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:59:39,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818504357] [2021-11-21 00:59:39,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:59:39,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:59:39,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:59:41,157 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 7905 proven. 32339 refuted. 0 times theorem prover too weak. 345362 trivial. 0 not checked. [2021-11-21 00:59:41,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:59:41,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818504357] [2021-11-21 00:59:41,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818504357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:59:41,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018638908] [2021-11-21 00:59:41,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:59:41,158 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:59:41,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:59:41,159 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:59:41,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:59:42,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:59:42,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 5989 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:59:42,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:59:46,824 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 180359 proven. 20414 refuted. 0 times theorem prover too weak. 184833 trivial. 0 not checked. [2021-11-21 00:59:46,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:59:56,562 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 9523 proven. 36246 refuted. 0 times theorem prover too weak. 339837 trivial. 0 not checked. [2021-11-21 00:59:56,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018638908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:59:56,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415284263] [2021-11-21 00:59:56,566 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 00:59:56,567 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:59:56,567 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 00:59:56,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:59:56,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 36] total 41 [2021-11-21 00:59:56,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276156750] [2021-11-21 00:59:56,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:59:56,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 00:59:56,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:59:56,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 00:59:56,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1399, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:59:56,578 INFO L87 Difference]: Start difference. First operand 189 states and 251 transitions. Second operand has 41 states, 41 states have (on average 5.951219512195122) internal successors, (244), 41 states have internal predecessors, (244), 36 states have call successors, (43), 5 states have call predecessors, (43), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2021-11-21 00:59:57,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:59:57,923 INFO L93 Difference]: Finished difference Result 466 states and 662 transitions. [2021-11-21 00:59:57,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-21 00:59:57,925 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 5.951219512195122) internal successors, (244), 41 states have internal predecessors, (244), 36 states have call successors, (43), 5 states have call predecessors, (43), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) Word has length 3229 [2021-11-21 00:59:57,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:59:57,930 INFO L225 Difference]: With dead ends: 466 [2021-11-21 00:59:57,931 INFO L226 Difference]: Without dead ends: 282 [2021-11-21 00:59:57,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6547 GetRequests, 6453 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2134 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2094, Invalid=6648, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 00:59:57,935 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 1590 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 862 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1590 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 1385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 862 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:59:57,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1590 Valid, 171 Invalid, 1385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [862 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:59:57,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-21 00:59:57,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 195. [2021-11-21 00:59:57,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 157 states have (on average 1.019108280254777) internal successors, (160), 155 states have internal predecessors, (160), 26 states have call successors, (26), 19 states have call predecessors, (26), 11 states have return successors, (70), 20 states have call predecessors, (70), 25 states have call successors, (70) [2021-11-21 00:59:57,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 256 transitions. [2021-11-21 00:59:57,950 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 256 transitions. Word has length 3229 [2021-11-21 00:59:57,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:59:57,951 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 256 transitions. [2021-11-21 00:59:57,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 5.951219512195122) internal successors, (244), 41 states have internal predecessors, (244), 36 states have call successors, (43), 5 states have call predecessors, (43), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2021-11-21 00:59:57,952 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 256 transitions. [2021-11-21 00:59:58,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2817 [2021-11-21 00:59:58,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:59:58,011 INFO L514 BasicCegarLoop]: trace histogram [288, 286, 233, 144, 144, 144, 144, 143, 143, 143, 143, 143, 143, 143, 142, 142, 89, 55, 1, 1, 1, 1] [2021-11-21 00:59:58,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:59:58,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:59:58,231 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 00:59:58,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:59:58,232 INFO L85 PathProgramCache]: Analyzing trace with hash 240077041, now seen corresponding path program 14 times [2021-11-21 00:59:58,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:59:58,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800048915] [2021-11-21 00:59:58,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:59:58,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:59:59,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:00:02,156 INFO L134 CoverageAnalysis]: Checked inductivity of 293011 backedges. 50344 proven. 69909 refuted. 0 times theorem prover too weak. 172758 trivial. 0 not checked. [2021-11-21 01:00:02,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:00:02,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800048915] [2021-11-21 01:00:02,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800048915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:00:02,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302289364] [2021-11-21 01:00:02,157 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:00:02,157 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:00:02,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:00:02,158 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:00:02,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:00:05,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 214 check-sat command(s) [2021-11-21 01:00:05,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:00:05,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 5227 conjuncts, 573 conjunts are in the unsatisfiable core [2021-11-21 01:00:05,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:00:11,115 INFO L134 CoverageAnalysis]: Checked inductivity of 293011 backedges. 49486 proven. 53497 refuted. 0 times theorem prover too weak. 190028 trivial. 0 not checked. [2021-11-21 01:00:11,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:46,206 INFO L134 CoverageAnalysis]: Checked inductivity of 293011 backedges. 53101 proven. 51887 refuted. 0 times theorem prover too weak. 188023 trivial. 0 not checked. [2021-11-21 01:02:46,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302289364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:46,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2093916160] [2021-11-21 01:02:46,209 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:02:46,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:46,210 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 01:02:46,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:46,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 53] total 73 [2021-11-21 01:02:46,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516119772] [2021-11-21 01:02:46,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:46,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-21 01:02:46,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:46,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-21 01:02:46,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=4249, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:02:46,218 INFO L87 Difference]: Start difference. First operand 195 states and 256 transitions. Second operand has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-21 01:02:46,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:46,660 INFO L93 Difference]: Finished difference Result 242 states and 347 transitions. [2021-11-21 01:02:46,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 01:02:46,661 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) Word has length 2816 [2021-11-21 01:02:46,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:46,669 INFO L225 Difference]: With dead ends: 242 [2021-11-21 01:02:46,669 INFO L226 Difference]: Without dead ends: 241 [2021-11-21 01:02:46,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6209 GetRequests, 6131 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2765 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1341, Invalid=4979, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 01:02:46,671 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 112 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:46,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 315 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:02:46,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-11-21 01:02:46,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 222. [2021-11-21 01:02:46,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 176 states have internal predecessors, (181), 29 states have call successors, (29), 19 states have call predecessors, (29), 14 states have return successors, (112), 26 states have call predecessors, (112), 28 states have call successors, (112) [2021-11-21 01:02:46,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 322 transitions. [2021-11-21 01:02:46,692 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 322 transitions. Word has length 2816 [2021-11-21 01:02:46,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:46,695 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 322 transitions. [2021-11-21 01:02:46,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 2.506849315068493) internal successors, (183), 74 states have internal predecessors, (183), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-21 01:02:46,696 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 322 transitions. [2021-11-21 01:02:47,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8747 [2021-11-21 01:02:47,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:47,348 INFO L514 BasicCegarLoop]: trace histogram [895, 887, 725, 450, 450, 450, 450, 444, 444, 444, 444, 444, 443, 443, 442, 442, 275, 170, 1, 1, 1, 1] [2021-11-21 01:02:47,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:47,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:47,549 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 01:02:47,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:47,551 INFO L85 PathProgramCache]: Analyzing trace with hash 2021190472, now seen corresponding path program 15 times [2021-11-21 01:02:47,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:47,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167417753] [2021-11-21 01:02:47,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:47,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:51,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2838188 backedges. 13125 proven. 102463 refuted. 0 times theorem prover too weak. 2722600 trivial. 0 not checked. [2021-11-21 01:02:57,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:57,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167417753] [2021-11-21 01:02:57,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167417753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:57,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141085543] [2021-11-21 01:02:57,060 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:57,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:57,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:57,061 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:57,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:03:00,430 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:00,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:00,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 10819 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-21 01:03:00,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:12,566 INFO L134 CoverageAnalysis]: Checked inductivity of 2838188 backedges. 1380769 proven. 36207 refuted. 0 times theorem prover too weak. 1421212 trivial. 0 not checked. [2021-11-21 01:03:12,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:38,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2838188 backedges. 15723 proven. 115321 refuted. 0 times theorem prover too weak. 2707144 trivial. 0 not checked. [2021-11-21 01:03:38,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141085543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:38,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1814634120] [2021-11-21 01:03:38,154 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:03:38,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:38,155 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 01:03:38,156 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:38,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 37] total 42 [2021-11-21 01:03:38,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426977457] [2021-11-21 01:03:38,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:38,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-21 01:03:38,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:38,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-21 01:03:38,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1472, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:03:38,174 INFO L87 Difference]: Start difference. First operand 222 states and 322 transitions. Second operand has 42 states, 42 states have (on average 5.880952380952381) internal successors, (247), 42 states have internal predecessors, (247), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) [2021-11-21 01:03:39,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:39,282 INFO L93 Difference]: Finished difference Result 516 states and 835 transitions. [2021-11-21 01:03:39,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-21 01:03:39,283 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.880952380952381) internal successors, (247), 42 states have internal predecessors, (247), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) Word has length 8746 [2021-11-21 01:03:39,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:39,289 INFO L225 Difference]: With dead ends: 516 [2021-11-21 01:03:39,289 INFO L226 Difference]: Without dead ends: 299 [2021-11-21 01:03:39,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17579 GetRequests, 17491 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1824 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1954, Invalid=5702, Unknown=0, NotChecked=0, Total=7656 [2021-11-21 01:03:39,295 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 786 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 786 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:39,295 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [786 Valid, 167 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 460 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:03:39,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-21 01:03:39,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 228. [2021-11-21 01:03:39,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 183 states have (on average 1.0163934426229508) internal successors, (186), 181 states have internal predecessors, (186), 30 states have call successors, (30), 20 states have call predecessors, (30), 14 states have return successors, (109), 26 states have call predecessors, (109), 29 states have call successors, (109) [2021-11-21 01:03:39,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 325 transitions. [2021-11-21 01:03:39,314 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 325 transitions. Word has length 8746 [2021-11-21 01:03:39,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:39,318 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 325 transitions. [2021-11-21 01:03:39,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.880952380952381) internal successors, (247), 42 states have internal predecessors, (247), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) [2021-11-21 01:03:39,318 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 325 transitions. [2021-11-21 01:03:39,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5642 [2021-11-21 01:03:39,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:39,501 INFO L514 BasicCegarLoop]: trace histogram [576, 574, 466, 288, 288, 288, 288, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-21 01:03:39,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:39,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:39,702 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 01:03:39,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:39,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1218820887, now seen corresponding path program 16 times [2021-11-21 01:03:39,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:39,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837088976] [2021-11-21 01:03:39,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:39,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:41,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:43,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 29084 proven. 67761 refuted. 0 times theorem prover too weak. 1082587 trivial. 0 not checked. [2021-11-21 01:03:43,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:43,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837088976] [2021-11-21 01:03:43,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837088976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:43,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801899130] [2021-11-21 01:03:43,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:43,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:43,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:43,835 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:43,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:03:46,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:46,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 10445 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 01:03:47,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:54,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71094 refuted. 0 times theorem prover too weak. 1075808 trivial. 0 not checked. [2021-11-21 01:03:54,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:14,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71574 refuted. 0 times theorem prover too weak. 1075328 trivial. 0 not checked. [2021-11-21 01:04:14,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801899130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:14,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425674288] [2021-11-21 01:04:14,875 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:04:14,875 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:14,876 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 01:04:14,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:14,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 47] total 52 [2021-11-21 01:04:14,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165104980] [2021-11-21 01:04:14,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:14,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 01:04:14,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:14,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 01:04:14,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=2248, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:04:14,887 INFO L87 Difference]: Start difference. First operand 228 states and 325 transitions. Second operand has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-21 01:04:17,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:17,101 INFO L93 Difference]: Finished difference Result 526 states and 840 transitions. [2021-11-21 01:04:17,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-21 01:04:17,102 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) Word has length 5641 [2021-11-21 01:04:17,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:17,108 INFO L225 Difference]: With dead ends: 526 [2021-11-21 01:04:17,108 INFO L226 Difference]: Without dead ends: 303 [2021-11-21 01:04:17,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11379 GetRequests, 11276 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2433 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2404, Invalid=8102, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:04:17,113 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 2168 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 1361 mSolverCounterSat, 2601 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2168 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 3962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2601 IncrementalHoareTripleChecker+Valid, 1361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:17,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2168 Valid, 364 Invalid, 3962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2601 Valid, 1361 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 01:04:17,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-21 01:04:17,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 290. [2021-11-21 01:04:17,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 231 states have internal predecessors, (240), 39 states have call successors, (39), 29 states have call predecessors, (39), 15 states have return successors, (130), 29 states have call predecessors, (130), 38 states have call successors, (130) [2021-11-21 01:04:17,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 409 transitions. [2021-11-21 01:04:17,136 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 409 transitions. Word has length 5641 [2021-11-21 01:04:17,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:17,139 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 409 transitions. [2021-11-21 01:04:17,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-21 01:04:17,140 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 409 transitions. [2021-11-21 01:04:17,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5642 [2021-11-21 01:04:17,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:17,445 INFO L514 BasicCegarLoop]: trace histogram [576, 574, 466, 288, 288, 288, 288, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-21 01:04:17,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:17,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 01:04:17,659 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 01:04:17,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:17,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1261349433, now seen corresponding path program 17 times [2021-11-21 01:04:17,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:17,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41538284] [2021-11-21 01:04:17,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:17,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:19,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:21,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 28018 proven. 67065 refuted. 0 times theorem prover too weak. 1084349 trivial. 0 not checked. [2021-11-21 01:04:21,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:21,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41538284] [2021-11-21 01:04:21,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41538284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:21,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325727287] [2021-11-21 01:04:21,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:21,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:21,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:21,840 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:21,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:04:25,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 141 check-sat command(s) [2021-11-21 01:04:25,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:25,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 3433 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 01:04:25,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:32,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 31585 proven. 52534 refuted. 0 times theorem prover too weak. 1095313 trivial. 0 not checked. [2021-11-21 01:04:32,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:52,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 31585 proven. 52915 refuted. 0 times theorem prover too weak. 1094932 trivial. 0 not checked. [2021-11-21 01:04:52,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325727287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:52,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785552506] [2021-11-21 01:04:52,115 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:04:52,115 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:52,116 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 01:04:52,116 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:52,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 23, 39] total 50 [2021-11-21 01:04:52,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914724260] [2021-11-21 01:04:52,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:52,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-21 01:04:52,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:52,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-21 01:04:52,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=2044, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:04:52,125 INFO L87 Difference]: Start difference. First operand 290 states and 409 transitions. Second operand has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) [2021-11-21 01:04:53,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:53,660 INFO L93 Difference]: Finished difference Result 615 states and 907 transitions. [2021-11-21 01:04:53,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-21 01:04:53,664 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) Word has length 5641 [2021-11-21 01:04:53,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:53,670 INFO L225 Difference]: With dead ends: 615 [2021-11-21 01:04:53,670 INFO L226 Difference]: Without dead ends: 330 [2021-11-21 01:04:53,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11357 GetRequests, 11270 SyntacticMatches, 6 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1572, Invalid=5234, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 01:04:53,676 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 905 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 1586 mSolverCounterSat, 870 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 905 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 2456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 870 IncrementalHoareTripleChecker+Valid, 1586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:53,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [905 Valid, 469 Invalid, 2456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [870 Valid, 1586 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:04:53,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-21 01:04:53,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 237. [2021-11-21 01:04:53,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 189 states have internal predecessors, (194), 32 states have call successors, (32), 23 states have call predecessors, (32), 13 states have return successors, (97), 24 states have call predecessors, (97), 31 states have call successors, (97) [2021-11-21 01:04:53,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 323 transitions. [2021-11-21 01:04:53,698 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 323 transitions. Word has length 5641 [2021-11-21 01:04:53,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:53,702 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 323 transitions. [2021-11-21 01:04:53,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.88) internal successors, (294), 50 states have internal predecessors, (294), 42 states have call successors, (51), 1 states have call predecessors, (51), 25 states have return successors, (75), 31 states have call predecessors, (75), 42 states have call successors, (75) [2021-11-21 01:04:53,703 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 323 transitions. [2021-11-21 01:04:54,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11954 [2021-11-21 01:04:54,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:54,620 INFO L514 BasicCegarLoop]: trace histogram [1220, 1217, 987, 610, 610, 610, 610, 609, 609, 609, 609, 609, 608, 608, 607, 607, 377, 233, 1, 1, 1, 1] [2021-11-21 01:04:54,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-21 01:04:54,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 01:04:54,821 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 01:04:54,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:54,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1873806495, now seen corresponding path program 18 times [2021-11-21 01:04:54,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:54,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734266088] [2021-11-21 01:04:54,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:54,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:01,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:12,183 INFO L134 CoverageAnalysis]: Checked inductivity of 5304399 backedges. 52198 proven. 174605 refuted. 0 times theorem prover too weak. 5077596 trivial. 0 not checked. [2021-11-21 01:05:12,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:12,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734266088] [2021-11-21 01:05:12,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734266088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:12,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523706958] [2021-11-21 01:05:12,184 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:05:12,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:12,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:12,185 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:12,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:05:16,449 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:05:16,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:16,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 14778 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-21 01:05:16,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:33,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5304399 backedges. 1969690 proven. 128475 refuted. 0 times theorem prover too weak. 3206234 trivial. 0 not checked. [2021-11-21 01:05:33,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:16,717 INFO L134 CoverageAnalysis]: Checked inductivity of 5304399 backedges. 60075 proven. 187985 refuted. 0 times theorem prover too weak. 5056339 trivial. 0 not checked. [2021-11-21 01:06:16,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523706958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:16,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [518532597] [2021-11-21 01:06:16,723 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:06:16,723 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:16,724 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-21 01:06:16,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:16,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 50] total 55 [2021-11-21 01:06:16,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564660976] [2021-11-21 01:06:16,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:16,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 01:06:16,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:16,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 01:06:16,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=2535, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:06:16,748 INFO L87 Difference]: Start difference. First operand 237 states and 323 transitions. Second operand has 55 states, 55 states have (on average 6.0) internal successors, (330), 55 states have internal predecessors, (330), 50 states have call successors, (57), 3 states have call predecessors, (57), 25 states have return successors, (76), 27 states have call predecessors, (76), 49 states have call successors, (76) [2021-11-21 01:06:19,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:19,194 INFO L93 Difference]: Finished difference Result 590 states and 877 transitions. [2021-11-21 01:06:19,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-21 01:06:19,204 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 6.0) internal successors, (330), 55 states have internal predecessors, (330), 50 states have call successors, (57), 3 states have call predecessors, (57), 25 states have return successors, (76), 27 states have call predecessors, (76), 49 states have call successors, (76) Word has length 11953 [2021-11-21 01:06:19,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:19,214 INFO L225 Difference]: With dead ends: 590 [2021-11-21 01:06:19,214 INFO L226 Difference]: Without dead ends: 358 [2021-11-21 01:06:19,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24025 GetRequests, 23900 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3822 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3396, Invalid=12104, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 01:06:19,220 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 1449 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 1099 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1449 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 2365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1099 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:19,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1449 Valid, 349 Invalid, 2365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1099 Valid, 1266 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:06:19,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-21 01:06:19,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 250. [2021-11-21 01:06:19,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 201 states have (on average 1.0149253731343284) internal successors, (204), 200 states have internal predecessors, (204), 34 states have call successors, (34), 24 states have call predecessors, (34), 14 states have return successors, (110), 25 states have call predecessors, (110), 33 states have call successors, (110) [2021-11-21 01:06:19,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 348 transitions. [2021-11-21 01:06:19,246 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 348 transitions. Word has length 11953 [2021-11-21 01:06:19,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:19,252 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 348 transitions. [2021-11-21 01:06:19,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 6.0) internal successors, (330), 55 states have internal predecessors, (330), 50 states have call successors, (57), 3 states have call predecessors, (57), 25 states have return successors, (76), 27 states have call predecessors, (76), 49 states have call successors, (76) [2021-11-21 01:06:19,253 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 348 transitions. [2021-11-21 01:06:19,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7388 [2021-11-21 01:06:19,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:19,766 INFO L514 BasicCegarLoop]: trace histogram [754, 752, 610, 377, 377, 377, 377, 376, 376, 376, 376, 376, 376, 376, 375, 375, 233, 144, 1, 1, 1, 1] [2021-11-21 01:06:19,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:19,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 01:06:19,967 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-21 01:06:19,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:19,970 INFO L85 PathProgramCache]: Analyzing trace with hash 636776992, now seen corresponding path program 19 times [2021-11-21 01:06:19,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:19,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232323161] [2021-11-21 01:06:19,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:19,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:24,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:33,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2024012 backedges. 357292 proven. 476645 refuted. 0 times theorem prover too weak. 1190075 trivial. 0 not checked. [2021-11-21 01:06:33,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:33,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232323161] [2021-11-21 01:06:33,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232323161] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:33,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124235794] [2021-11-21 01:06:33,615 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:06:33,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:33,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:33,622 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:33,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18f2696a-7db5-4388-9561-40f322c3f58b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:06:38,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:38,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 13670 conjuncts, 1505 conjunts are in the unsatisfiable core [2021-11-21 01:06:38,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:58,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2024012 backedges. 351088 proven. 364481 refuted. 0 times theorem prover too weak. 1308443 trivial. 0 not checked. [2021-11-21 01:06:58,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:33,622 WARN L227 SmtUtils]: Spent 5.65s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-21 01:07:39,127 WARN L227 SmtUtils]: Spent 5.47s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-21 01:07:44,630 WARN L227 SmtUtils]: Spent 5.48s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-21 01:07:50,149 WARN L227 SmtUtils]: Spent 5.49s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-21 01:08:26,211 WARN L227 SmtUtils]: Spent 14.71s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)