./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:56:54,298 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:56:54,430 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-11-12 00:56:54,435 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:56:54,436 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:56:54,481 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:56:54,483 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:56:54,484 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:56:54,485 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:56:54,490 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:56:54,491 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:56:54,491 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:56:54,492 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:56:54,493 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:56:54,494 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:56:54,494 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:56:54,495 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:56:54,495 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:56:54,496 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:56:54,496 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:56:54,497 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:56:54,497 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:56:54,498 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:56:54,499 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:56:54,499 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:56:54,500 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:56:54,500 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:56:54,501 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:56:54,501 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:56:54,501 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:56:54,503 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:56:54,503 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-12 00:56:54,503 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:56:54,504 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:56:54,504 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:56:54,504 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:56:54,504 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:56:54,505 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:56:54,505 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:54,505 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:56:54,505 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:56:54,506 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:56:54,506 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:56:54,506 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:56:54,507 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:56:54,507 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:56:54,507 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:56:54,507 INFO L153 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_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 [2023-11-12 00:56:54,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:56:54,956 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:56:54,959 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:56:54,963 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:56:54,963 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:56:54,965 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2023-11-12 00:56:58,652 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:56:58,908 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:56:58,909 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/sv-benchmarks/c/recursive/Fibonacci01-1.c [2023-11-12 00:56:58,918 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/data/dbcd4bcf6/d58fb6b1767143889fdc06115a4fe237/FLAG6e0ef04bc [2023-11-12 00:56:58,938 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/data/dbcd4bcf6/d58fb6b1767143889fdc06115a4fe237 [2023-11-12 00:56:58,940 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:56:58,942 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:56:58,944 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:58,944 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:56:58,952 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:56:58,953 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:58" (1/1) ... [2023-11-12 00:56:58,954 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2229641e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:58, skipping insertion in model container [2023-11-12 00:56:58,954 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:58" (1/1) ... [2023-11-12 00:56:58,977 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:56:59,135 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:59,148 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:56:59,165 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:59,183 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:56:59,183 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59 WrapperNode [2023-11-12 00:56:59,184 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:59,185 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:59,185 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:56:59,186 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:56:59,193 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,201 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,221 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 29 [2023-11-12 00:56:59,222 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:59,223 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:56:59,223 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:56:59,223 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:56:59,232 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,232 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,233 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,234 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,237 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,239 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,241 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,242 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,244 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:56:59,245 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:56:59,245 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:56:59,245 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:56:59,246 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (1/1) ... [2023-11-12 00:56:59,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:59,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:59,293 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:56:59,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:56:59,331 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2023-11-12 00:56:59,331 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2023-11-12 00:56:59,331 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:56:59,332 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:56:59,332 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:56:59,332 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:56:59,398 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:56:59,401 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:56:59,655 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:56:59,699 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:56:59,709 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-12 00:56:59,712 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:59 BoogieIcfgContainer [2023-11-12 00:56:59,713 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:56:59,719 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:56:59,721 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:56:59,725 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:56:59,726 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:56:58" (1/3) ... [2023-11-12 00:56:59,728 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ce7ebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:59, skipping insertion in model container [2023-11-12 00:56:59,729 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:59" (2/3) ... [2023-11-12 00:56:59,730 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ce7ebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:59, skipping insertion in model container [2023-11-12 00:56:59,730 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:59" (3/3) ... [2023-11-12 00:56:59,733 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2023-11-12 00:56:59,758 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:56:59,758 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-11-12 00:56:59,810 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:56:59,818 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2298cd58, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:56:59,818 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-11-12 00:56:59,822 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:56:59,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:56:59,831 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:59,831 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:59,832 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:56:59,838 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:59,838 INFO L85 PathProgramCache]: Analyzing trace with hash -732564074, now seen corresponding path program 1 times [2023-11-12 00:56:59,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:59,850 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215149060] [2023-11-12 00:56:59,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:59,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:59,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:00,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:57:00,158 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:00,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215149060] [2023-11-12 00:57:00,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215149060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:00,159 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:57:00,160 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:57:00,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155389894] [2023-11-12 00:57:00,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:00,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:57:00,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:00,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:57:00,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:57:00,225 INFO L87 Difference]: Start difference. First operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:57:00,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:00,327 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2023-11-12 00:57:00,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:57:00,335 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:57:00,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:00,345 INFO L225 Difference]: With dead ends: 33 [2023-11-12 00:57:00,346 INFO L226 Difference]: Without dead ends: 29 [2023-11-12 00:57:00,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:57:00,360 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:00,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 38 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:00,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-12 00:57:00,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2023-11-12 00:57:00,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.411764705882353) internal successors, (24), 22 states have internal predecessors, (24), 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) [2023-11-12 00:57:00,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2023-11-12 00:57:00,430 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 7 [2023-11-12 00:57:00,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:00,431 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2023-11-12 00:57:00,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:57:00,432 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2023-11-12 00:57:00,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:57:00,434 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:00,435 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:00,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:57:00,437 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:00,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:00,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1234649772, now seen corresponding path program 1 times [2023-11-12 00:57:00,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:00,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636657089] [2023-11-12 00:57:00,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:00,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:00,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:00,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:57:00,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:00,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636657089] [2023-11-12 00:57:00,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636657089] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:00,549 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:57:00,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:57:00,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604740407] [2023-11-12 00:57:00,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:00,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:00,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:00,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:00,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:57:00,554 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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) [2023-11-12 00:57:00,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:00,641 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2023-11-12 00:57:00,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:57:00,642 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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 [2023-11-12 00:57:00,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:00,643 INFO L225 Difference]: With dead ends: 27 [2023-11-12 00:57:00,644 INFO L226 Difference]: Without dead ends: 23 [2023-11-12 00:57:00,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:57:00,646 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:00,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 25 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:00,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-12 00:57:00,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-12 00:57:00,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.25) 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, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:57:00,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-12 00:57:00,655 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 8 [2023-11-12 00:57:00,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:00,656 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-12 00:57:00,656 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 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) [2023-11-12 00:57:00,656 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-12 00:57:00,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:57:00,657 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:00,657 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:00,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:57:00,658 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:00,658 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:00,659 INFO L85 PathProgramCache]: Analyzing trace with hash 380191605, now seen corresponding path program 1 times [2023-11-12 00:57:00,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:00,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753562603] [2023-11-12 00:57:00,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:00,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:00,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:00,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:57:00,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:00,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753562603] [2023-11-12 00:57:00,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753562603] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:00,768 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:57:00,768 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:57:00,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399092944] [2023-11-12 00:57:00,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:00,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:57:00,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:00,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:57:00,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:57:00,775 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-12 00:57:00,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:00,795 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-11-12 00:57:00,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:57:00,798 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-12 00:57:00,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:00,803 INFO L225 Difference]: With dead ends: 23 [2023-11-12 00:57:00,804 INFO L226 Difference]: Without dead ends: 20 [2023-11-12 00:57:00,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:57:00,807 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:00,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:57:00,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-12 00:57:00,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-12 00:57:00,813 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) [2023-11-12 00:57:00,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-12 00:57:00,814 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 9 [2023-11-12 00:57:00,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:00,815 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-12 00:57:00,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-12 00:57:00,815 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-12 00:57:00,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-12 00:57:00,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:00,817 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:00,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:57:00,817 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:00,818 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:00,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1707217068, now seen corresponding path program 1 times [2023-11-12 00:57:00,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:00,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993112533] [2023-11-12 00:57:00,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:00,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:00,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:01,001 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-12 00:57:01,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:01,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993112533] [2023-11-12 00:57:01,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993112533] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:01,002 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:57:01,002 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:57:01,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328894932] [2023-11-12 00:57:01,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:01,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:01,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:01,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:01,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:57:01,004 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) [2023-11-12 00:57:01,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:01,092 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2023-11-12 00:57:01,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:57:01,093 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 29 [2023-11-12 00:57:01,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:01,097 INFO L225 Difference]: With dead ends: 36 [2023-11-12 00:57:01,097 INFO L226 Difference]: Without dead ends: 34 [2023-11-12 00:57:01,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:57:01,102 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:01,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 61 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:01,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-12 00:57:01,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2023-11-12 00:57:01,110 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) [2023-11-12 00:57:01,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-11-12 00:57:01,119 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 29 [2023-11-12 00:57:01,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:01,121 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-11-12 00:57:01,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:57:01,121 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-11-12 00:57:01,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:57:01,125 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:01,125 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:01,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:57:01,126 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:01,127 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:01,127 INFO L85 PathProgramCache]: Analyzing trace with hash 942478238, now seen corresponding path program 1 times [2023-11-12 00:57:01,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:01,127 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406533721] [2023-11-12 00:57:01,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:01,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:01,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:01,352 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:57:01,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:01,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406533721] [2023-11-12 00:57:01,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406533721] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:01,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797688152] [2023-11-12 00:57:01,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:01,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:01,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:01,358 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:01,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:57:01,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:01,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:57:01,457 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:01,604 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:57:01,604 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:01,848 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:57:01,848 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797688152] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:01,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867626466] [2023-11-12 00:57:01,873 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:57:01,873 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:01,878 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:01,881 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:01,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2023-11-12 00:57:01,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612820213] [2023-11-12 00:57:01,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:01,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:57:01,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:01,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:57:01,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:57:01,889 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) [2023-11-12 00:57:02,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:02,254 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2023-11-12 00:57:02,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:57:02,255 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 [2023-11-12 00:57:02,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:02,262 INFO L225 Difference]: With dead ends: 90 [2023-11-12 00:57:02,262 INFO L226 Difference]: Without dead ends: 64 [2023-11-12 00:57:02,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2023-11-12 00:57:02,273 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 147 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:02,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 62 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:57:02,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-12 00:57:02,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2023-11-12 00:57:02,306 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) [2023-11-12 00:57:02,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-11-12 00:57:02,312 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 24 [2023-11-12 00:57:02,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:02,314 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-11-12 00:57:02,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-12 00:57:02,315 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-11-12 00:57:02,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:57:02,317 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:02,317 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:02,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:02,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:02,524 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:02,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:02,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1594082104, now seen corresponding path program 2 times [2023-11-12 00:57:02,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:02,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439593184] [2023-11-12 00:57:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:02,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:02,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:02,653 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:57:02,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:02,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439593184] [2023-11-12 00:57:02,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439593184] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:02,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473278434] [2023-11-12 00:57:02,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:57:02,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:02,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:02,656 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:02,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:57:02,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:57:02,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:02,716 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:57:02,718 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:02,765 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:57:02,765 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:02,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473278434] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:02,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:02,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2023-11-12 00:57:02,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411770796] [2023-11-12 00:57:02,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:02,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:02,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:02,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:02,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:57:02,768 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) [2023-11-12 00:57:02,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:02,806 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2023-11-12 00:57:02,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:57:02,807 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 [2023-11-12 00:57:02,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:02,809 INFO L225 Difference]: With dead ends: 60 [2023-11-12 00:57:02,809 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 00:57:02,809 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:57:02,811 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 8 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:02,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:57:02,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 00:57:02,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2023-11-12 00:57:02,823 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) [2023-11-12 00:57:02,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2023-11-12 00:57:02,824 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2023-11-12 00:57:02,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:02,825 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2023-11-12 00:57:02,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:57:02,825 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2023-11-12 00:57:02,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-12 00:57:02,827 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:02,827 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:02,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:03,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:03,057 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:03,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:03,058 INFO L85 PathProgramCache]: Analyzing trace with hash 2123062382, now seen corresponding path program 1 times [2023-11-12 00:57:03,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:03,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563705095] [2023-11-12 00:57:03,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:03,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:03,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:03,229 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:57:03,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:03,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563705095] [2023-11-12 00:57:03,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563705095] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:03,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882147799] [2023-11-12 00:57:03,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:03,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:03,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:03,232 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:03,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:57:03,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:03,284 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:57:03,286 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:03,344 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:57:03,345 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:03,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882147799] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:03,345 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:03,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 9 [2023-11-12 00:57:03,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911454237] [2023-11-12 00:57:03,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:03,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:57:03,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:03,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:57:03,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:57:03,347 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:57:03,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:03,389 INFO L93 Difference]: Finished difference Result 83 states and 116 transitions. [2023-11-12 00:57:03,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:57:03,390 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2023-11-12 00:57:03,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:03,392 INFO L225 Difference]: With dead ends: 83 [2023-11-12 00:57:03,392 INFO L226 Difference]: Without dead ends: 82 [2023-11-12 00:57:03,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:57:03,394 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 4 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 63 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 [2023-11-12 00:57:03,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 63 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:57:03,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-12 00:57:03,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 63. [2023-11-12 00:57:03,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 49 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 11 states have call predecessors, (27), 7 states have call successors, (27) [2023-11-12 00:57:03,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 86 transitions. [2023-11-12 00:57:03,412 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 86 transitions. Word has length 25 [2023-11-12 00:57:03,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:03,412 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 86 transitions. [2023-11-12 00:57:03,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:57:03,413 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 86 transitions. [2023-11-12 00:57:03,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-12 00:57:03,415 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:03,415 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:03,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:03,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:03,630 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:03,630 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:03,630 INFO L85 PathProgramCache]: Analyzing trace with hash 1913747635, now seen corresponding path program 1 times [2023-11-12 00:57:03,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:03,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057135118] [2023-11-12 00:57:03,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:03,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:03,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:03,864 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-12 00:57:03,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:03,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057135118] [2023-11-12 00:57:03,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057135118] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:03,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433754316] [2023-11-12 00:57:03,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:03,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:03,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:03,866 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:03,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:57:03,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:03,924 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:57:03,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:04,026 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-12 00:57:04,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:04,274 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-11-12 00:57:04,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433754316] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:04,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985810729] [2023-11-12 00:57:04,282 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:04,282 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:04,287 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:04,288 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:04,288 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2023-11-12 00:57:04,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523580812] [2023-11-12 00:57:04,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:04,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-12 00:57:04,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:04,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-12 00:57:04,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:57:04,293 INFO L87 Difference]: Start difference. First operand 63 states and 86 transitions. Second operand has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 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) [2023-11-12 00:57:04,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:04,587 INFO L93 Difference]: Finished difference Result 147 states and 216 transitions. [2023-11-12 00:57:04,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-12 00:57:04,587 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 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 45 [2023-11-12 00:57:04,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:04,591 INFO L225 Difference]: With dead ends: 147 [2023-11-12 00:57:04,592 INFO L226 Difference]: Without dead ends: 145 [2023-11-12 00:57:04,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=395, Unknown=0, NotChecked=0, Total=552 [2023-11-12 00:57:04,594 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 22 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:04,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 142 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:57:04,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2023-11-12 00:57:04,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 97. [2023-11-12 00:57:04,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2023-11-12 00:57:04,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2023-11-12 00:57:04,618 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 45 [2023-11-12 00:57:04,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:04,618 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2023-11-12 00:57:04,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 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) [2023-11-12 00:57:04,619 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2023-11-12 00:57:04,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-11-12 00:57:04,623 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:04,624 INFO L195 NwaCegarLoop]: trace histogram [11, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2023-11-12 00:57:04,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:04,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:04,840 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:04,841 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:04,841 INFO L85 PathProgramCache]: Analyzing trace with hash -160784908, now seen corresponding path program 1 times [2023-11-12 00:57:04,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:04,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148911674] [2023-11-12 00:57:04,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:04,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:04,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:05,037 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 40 proven. 109 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2023-11-12 00:57:05,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:05,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148911674] [2023-11-12 00:57:05,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148911674] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:05,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81241061] [2023-11-12 00:57:05,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:05,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:05,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:05,040 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:05,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:57:05,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:05,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 00:57:05,121 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:05,217 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 167 proven. 67 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-12 00:57:05,217 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:05,519 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 49 proven. 137 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-12 00:57:05,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81241061] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:05,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804065570] [2023-11-12 00:57:05,522 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:05,523 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:05,523 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:05,524 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:05,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 10] total 13 [2023-11-12 00:57:05,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316160198] [2023-11-12 00:57:05,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:05,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:57:05,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:05,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:57:05,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2023-11-12 00:57:05,528 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 13 states, 13 states have (on average 5.846153846153846) internal successors, (76), 13 states have internal predecessors, (76), 8 states have call successors, (14), 3 states have call predecessors, (14), 5 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-12 00:57:05,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:05,724 INFO L93 Difference]: Finished difference Result 223 states and 400 transitions. [2023-11-12 00:57:05,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:57:05,725 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 5.846153846153846) internal successors, (76), 13 states have internal predecessors, (76), 8 states have call successors, (14), 3 states have call predecessors, (14), 5 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) Word has length 96 [2023-11-12 00:57:05,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:05,730 INFO L225 Difference]: With dead ends: 223 [2023-11-12 00:57:05,730 INFO L226 Difference]: Without dead ends: 129 [2023-11-12 00:57:05,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 186 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:57:05,735 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 119 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:05,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 51 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:05,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-12 00:57:05,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 109. [2023-11-12 00:57:05,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 85 states have (on average 1.0823529411764705) internal successors, (92), 83 states have internal predecessors, (92), 12 states have call successors, (12), 3 states have call predecessors, (12), 10 states have return successors, (75), 22 states have call predecessors, (75), 11 states have call successors, (75) [2023-11-12 00:57:05,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 179 transitions. [2023-11-12 00:57:05,768 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 179 transitions. Word has length 96 [2023-11-12 00:57:05,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:05,769 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 179 transitions. [2023-11-12 00:57:05,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 5.846153846153846) internal successors, (76), 13 states have internal predecessors, (76), 8 states have call successors, (14), 3 states have call predecessors, (14), 5 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-12 00:57:05,770 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 179 transitions. [2023-11-12 00:57:05,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-12 00:57:05,773 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:05,773 INFO L195 NwaCegarLoop]: trace histogram [15, 13, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 5, 3, 1, 1, 1, 1] [2023-11-12 00:57:05,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:05,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:05,979 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:05,980 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:05,980 INFO L85 PathProgramCache]: Analyzing trace with hash 269188336, now seen corresponding path program 2 times [2023-11-12 00:57:05,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:05,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745654517] [2023-11-12 00:57:05,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:05,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:06,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:06,312 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 89 proven. 266 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2023-11-12 00:57:06,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:06,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745654517] [2023-11-12 00:57:06,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745654517] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:06,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310031956] [2023-11-12 00:57:06,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:57:06,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:06,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:06,315 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:06,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:57:06,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 00:57:06,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:06,389 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:57:06,402 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:06,557 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 121 proven. 4 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2023-11-12 00:57:06,557 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:06,846 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 121 proven. 4 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2023-11-12 00:57:06,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310031956] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:06,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494344067] [2023-11-12 00:57:06,852 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:06,852 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:06,853 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:06,854 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:06,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 21 [2023-11-12 00:57:06,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355807507] [2023-11-12 00:57:06,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:06,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-12 00:57:06,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:06,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-12 00:57:06,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:57:06,861 INFO L87 Difference]: Start difference. First operand 109 states and 179 transitions. Second operand has 21 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 21 states have internal predecessors, (85), 11 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (16), 12 states have call predecessors, (16), 10 states have call successors, (16) [2023-11-12 00:57:08,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:08,268 INFO L93 Difference]: Finished difference Result 371 states and 713 transitions. [2023-11-12 00:57:08,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-12 00:57:08,269 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 21 states have internal predecessors, (85), 11 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (16), 12 states have call predecessors, (16), 10 states have call successors, (16) Word has length 135 [2023-11-12 00:57:08,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:08,273 INFO L225 Difference]: With dead ends: 371 [2023-11-12 00:57:08,273 INFO L226 Difference]: Without dead ends: 265 [2023-11-12 00:57:08,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 266 SyntacticMatches, 4 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=984, Invalid=3438, Unknown=0, NotChecked=0, Total=4422 [2023-11-12 00:57:08,279 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 212 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:08,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 70 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:57:08,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2023-11-12 00:57:08,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 194. [2023-11-12 00:57:08,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 153 states have (on average 1.0718954248366013) internal successors, (164), 149 states have internal predecessors, (164), 21 states have call successors, (21), 4 states have call predecessors, (21), 18 states have return successors, (165), 40 states have call predecessors, (165), 20 states have call successors, (165) [2023-11-12 00:57:08,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 350 transitions. [2023-11-12 00:57:08,318 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 350 transitions. Word has length 135 [2023-11-12 00:57:08,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:08,318 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 350 transitions. [2023-11-12 00:57:08,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 21 states have internal predecessors, (85), 11 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (16), 12 states have call predecessors, (16), 10 states have call successors, (16) [2023-11-12 00:57:08,319 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 350 transitions. [2023-11-12 00:57:08,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2023-11-12 00:57:08,321 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:08,321 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2023-11-12 00:57:08,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:08,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:57:08,528 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:08,528 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:08,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1030158283, now seen corresponding path program 2 times [2023-11-12 00:57:08,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:08,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422656272] [2023-11-12 00:57:08,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:08,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:08,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:08,617 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2023-11-12 00:57:08,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:08,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422656272] [2023-11-12 00:57:08,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422656272] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:08,618 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:57:08,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:57:08,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076133129] [2023-11-12 00:57:08,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:08,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:08,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:08,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:08,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:57:08,620 INFO L87 Difference]: Start difference. First operand 194 states and 350 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) [2023-11-12 00:57:08,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:08,657 INFO L93 Difference]: Finished difference Result 207 states and 364 transitions. [2023-11-12 00:57:08,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:57:08,658 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 84 [2023-11-12 00:57:08,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:08,661 INFO L225 Difference]: With dead ends: 207 [2023-11-12 00:57:08,661 INFO L226 Difference]: Without dead ends: 206 [2023-11-12 00:57:08,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:57:08,663 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 4 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 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 [2023-11-12 00:57:08,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:57:08,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2023-11-12 00:57:08,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 194. [2023-11-12 00:57:08,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 153 states have (on average 1.0718954248366013) internal successors, (164), 149 states have internal predecessors, (164), 21 states have call successors, (21), 4 states have call predecessors, (21), 18 states have return successors, (165), 40 states have call predecessors, (165), 20 states have call successors, (165) [2023-11-12 00:57:08,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 350 transitions. [2023-11-12 00:57:08,693 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 350 transitions. Word has length 84 [2023-11-12 00:57:08,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:08,693 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 350 transitions. [2023-11-12 00:57:08,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:57:08,694 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 350 transitions. [2023-11-12 00:57:08,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-11-12 00:57:08,696 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:08,696 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1] [2023-11-12 00:57:08,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 00:57:08,696 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:08,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:08,697 INFO L85 PathProgramCache]: Analyzing trace with hash -2079317507, now seen corresponding path program 3 times [2023-11-12 00:57:08,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:08,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008126544] [2023-11-12 00:57:08,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:08,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:08,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:08,887 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 84 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-11-12 00:57:08,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:08,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008126544] [2023-11-12 00:57:08,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008126544] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:08,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881589497] [2023-11-12 00:57:08,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:57:08,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:08,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:08,889 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:08,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:57:08,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:57:08,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:08,950 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 00:57:08,954 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:09,024 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 125 proven. 37 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-12 00:57:09,025 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:09,560 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 90 proven. 62 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-12 00:57:09,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881589497] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:09,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368028785] [2023-11-12 00:57:09,564 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:09,564 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:09,564 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:09,565 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:09,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2023-11-12 00:57:09,566 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190367623] [2023-11-12 00:57:09,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:09,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-12 00:57:09,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:09,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-12 00:57:09,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:57:09,568 INFO L87 Difference]: Start difference. First operand 194 states and 350 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) [2023-11-12 00:57:09,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:09,749 INFO L93 Difference]: Finished difference Result 255 states and 463 transitions. [2023-11-12 00:57:09,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:57:09,750 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 85 [2023-11-12 00:57:09,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:09,751 INFO L225 Difference]: With dead ends: 255 [2023-11-12 00:57:09,751 INFO L226 Difference]: Without dead ends: 64 [2023-11-12 00:57:09,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 161 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2023-11-12 00:57:09,755 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 41 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:09,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 71 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:09,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-12 00:57:09,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-11-12 00:57:09,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 51 states have (on average 1.0588235294117647) 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) [2023-11-12 00:57:09,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2023-11-12 00:57:09,764 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 85 [2023-11-12 00:57:09,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:09,765 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2023-11-12 00:57:09,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2023-11-12 00:57:09,765 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2023-11-12 00:57:09,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-12 00:57:09,767 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:09,767 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1, 1] [2023-11-12 00:57:09,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:09,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-12 00:57:09,974 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:09,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:09,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1803751153, now seen corresponding path program 4 times [2023-11-12 00:57:09,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:09,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522464515] [2023-11-12 00:57:09,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:09,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:10,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:10,319 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 147 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2023-11-12 00:57:10,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:10,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522464515] [2023-11-12 00:57:10,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522464515] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:10,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500450916] [2023-11-12 00:57:10,320 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:57:10,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:10,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:10,321 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:10,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:57:10,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:10,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:57:10,417 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:10,524 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 143 proven. 182 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2023-11-12 00:57:10,525 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:11,372 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 143 proven. 202 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2023-11-12 00:57:11,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500450916] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:11,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136684502] [2023-11-12 00:57:11,379 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:11,379 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:11,380 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:11,381 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:11,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 20 [2023-11-12 00:57:11,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423448021] [2023-11-12 00:57:11,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:11,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-12 00:57:11,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:11,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-12 00:57:11,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:57:11,385 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 20 states, 20 states have (on average 4.9) internal successors, (98), 20 states have internal predecessors, (98), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2023-11-12 00:57:11,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:11,688 INFO L93 Difference]: Finished difference Result 131 states and 156 transitions. [2023-11-12 00:57:11,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-12 00:57:11,689 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.9) internal successors, (98), 20 states have internal predecessors, (98), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) Word has length 123 [2023-11-12 00:57:11,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:11,691 INFO L225 Difference]: With dead ends: 131 [2023-11-12 00:57:11,691 INFO L226 Difference]: Without dead ends: 72 [2023-11-12 00:57:11,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 235 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2023-11-12 00:57:11,693 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 81 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:11,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 111 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:57:11,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-12 00:57:11,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2023-11-12 00:57:11,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 54 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-12 00:57:11,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 80 transitions. [2023-11-12 00:57:11,703 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 80 transitions. Word has length 123 [2023-11-12 00:57:11,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:11,704 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 80 transitions. [2023-11-12 00:57:11,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.9) internal successors, (98), 20 states have internal predecessors, (98), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2023-11-12 00:57:11,704 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 80 transitions. [2023-11-12 00:57:11,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2023-11-12 00:57:11,709 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:11,709 INFO L195 NwaCegarLoop]: trace histogram [20, 18, 16, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 6, 4, 1, 1, 1, 1] [2023-11-12 00:57:11,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:11,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-12 00:57:11,921 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:11,921 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:11,922 INFO L85 PathProgramCache]: Analyzing trace with hash -1444640820, now seen corresponding path program 5 times [2023-11-12 00:57:11,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:11,922 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919901626] [2023-11-12 00:57:11,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:11,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:11,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:12,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 240 proven. 423 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2023-11-12 00:57:12,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:12,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919901626] [2023-11-12 00:57:12,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919901626] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:12,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530256894] [2023-11-12 00:57:12,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:57:12,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:12,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:12,385 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:12,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:57:12,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-11-12 00:57:12,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:12,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:57:12,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:12,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 367 proven. 253 refuted. 0 times theorem prover too weak. 573 trivial. 0 not checked. [2023-11-12 00:57:12,671 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 367 proven. 271 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2023-11-12 00:57:13,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530256894] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:13,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597389593] [2023-11-12 00:57:13,532 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:13,533 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:13,533 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:13,534 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:13,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15] total 22 [2023-11-12 00:57:13,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903089719] [2023-11-12 00:57:13,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:13,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-12 00:57:13,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:13,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-12 00:57:13,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2023-11-12 00:57:13,538 INFO L87 Difference]: Start difference. First operand 70 states and 80 transitions. Second operand has 22 states, 22 states have (on average 5.363636363636363) internal successors, (118), 22 states have internal predecessors, (118), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) [2023-11-12 00:57:13,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:13,946 INFO L93 Difference]: Finished difference Result 164 states and 200 transitions. [2023-11-12 00:57:13,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-12 00:57:13,947 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.363636363636363) internal successors, (118), 22 states have internal predecessors, (118), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) Word has length 188 [2023-11-12 00:57:13,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:13,949 INFO L225 Difference]: With dead ends: 164 [2023-11-12 00:57:13,949 INFO L226 Difference]: Without dead ends: 99 [2023-11-12 00:57:13,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 366 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1085, Unknown=0, NotChecked=0, Total=1482 [2023-11-12 00:57:13,951 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 139 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:13,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 77 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:57:13,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-12 00:57:13,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 82. [2023-11-12 00:57:13,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2023-11-12 00:57:13,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2023-11-12 00:57:13,960 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 188 [2023-11-12 00:57:13,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:13,961 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2023-11-12 00:57:13,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.363636363636363) internal successors, (118), 22 states have internal predecessors, (118), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 14 states have call predecessors, (26), 13 states have call successors, (26) [2023-11-12 00:57:13,961 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2023-11-12 00:57:13,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-11-12 00:57:13,963 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:13,963 INFO L195 NwaCegarLoop]: trace histogram [16, 14, 13, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 1, 1, 1, 1] [2023-11-12 00:57:13,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:14,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-12 00:57:14,169 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:14,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:14,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1282330840, now seen corresponding path program 6 times [2023-11-12 00:57:14,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:14,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065998153] [2023-11-12 00:57:14,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:14,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:14,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:14,871 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 78 proven. 189 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2023-11-12 00:57:14,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:14,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065998153] [2023-11-12 00:57:14,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065998153] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:14,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598001611] [2023-11-12 00:57:14,872 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:57:14,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:14,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:14,873 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:14,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:57:14,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:57:14,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:14,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-12 00:57:14,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:15,222 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 78 proven. 135 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2023-11-12 00:57:15,222 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:16,816 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 144 proven. 128 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2023-11-12 00:57:16,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598001611] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:16,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1859827105] [2023-11-12 00:57:16,818 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:16,819 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:16,819 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:16,820 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:16,821 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2023-11-12 00:57:16,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465890964] [2023-11-12 00:57:16,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:16,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-11-12 00:57:16,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:16,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-11-12 00:57:16,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2023-11-12 00:57:16,824 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2023-11-12 00:57:17,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:17,049 INFO L93 Difference]: Finished difference Result 115 states and 146 transitions. [2023-11-12 00:57:17,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:57:17,050 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) Word has length 149 [2023-11-12 00:57:17,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:17,052 INFO L225 Difference]: With dead ends: 115 [2023-11-12 00:57:17,052 INFO L226 Difference]: Without dead ends: 114 [2023-11-12 00:57:17,053 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 282 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=293, Invalid=967, Unknown=0, NotChecked=0, Total=1260 [2023-11-12 00:57:17,054 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:17,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 217 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:17,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-12 00:57:17,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 103. [2023-11-12 00:57:17,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 80 states have internal predecessors, (85), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (34), 14 states have call predecessors, (34), 11 states have call successors, (34) [2023-11-12 00:57:17,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 131 transitions. [2023-11-12 00:57:17,065 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 131 transitions. Word has length 149 [2023-11-12 00:57:17,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:17,066 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 131 transitions. [2023-11-12 00:57:17,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2023-11-12 00:57:17,066 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 131 transitions. [2023-11-12 00:57:17,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2023-11-12 00:57:17,075 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:17,075 INFO L195 NwaCegarLoop]: trace histogram [48, 45, 39, 24, 24, 24, 24, 23, 23, 23, 23, 23, 22, 22, 22, 21, 15, 9, 1, 1, 1, 1] [2023-11-12 00:57:17,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:17,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-12 00:57:17,281 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:17,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:17,282 INFO L85 PathProgramCache]: Analyzing trace with hash 207212746, now seen corresponding path program 7 times [2023-11-12 00:57:17,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:17,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928060855] [2023-11-12 00:57:17,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:17,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:17,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:18,302 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 554 proven. 1908 refuted. 0 times theorem prover too weak. 5048 trivial. 0 not checked. [2023-11-12 00:57:18,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:18,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928060855] [2023-11-12 00:57:18,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928060855] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:18,303 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348562475] [2023-11-12 00:57:18,303 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:57:18,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:18,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:18,304 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:18,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:57:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:18,532 INFO L262 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 00:57:18,541 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 3899 proven. 1274 refuted. 0 times theorem prover too weak. 2337 trivial. 0 not checked. [2023-11-12 00:57:18,761 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 635 proven. 2447 refuted. 0 times theorem prover too weak. 4428 trivial. 0 not checked. [2023-11-12 00:57:20,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348562475] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:20,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317694783] [2023-11-12 00:57:20,369 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:20,370 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:20,370 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:20,371 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:20,372 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 21] total 26 [2023-11-12 00:57:20,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116250678] [2023-11-12 00:57:20,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:20,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-12 00:57:20,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:20,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-12 00:57:20,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2023-11-12 00:57:20,377 INFO L87 Difference]: Start difference. First operand 103 states and 131 transitions. Second operand has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2023-11-12 00:57:20,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:20,863 INFO L93 Difference]: Finished difference Result 241 states and 330 transitions. [2023-11-12 00:57:20,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-12 00:57:20,864 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) Word has length 458 [2023-11-12 00:57:20,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:20,866 INFO L225 Difference]: With dead ends: 241 [2023-11-12 00:57:20,866 INFO L226 Difference]: Without dead ends: 143 [2023-11-12 00:57:20,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 901 SyntacticMatches, 13 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=568, Invalid=1502, Unknown=0, NotChecked=0, Total=2070 [2023-11-12 00:57:20,869 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 239 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:20,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 97 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:57:20,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-11-12 00:57:20,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 130. [2023-11-12 00:57:20,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 105 states have (on average 1.0476190476190477) internal successors, (110), 101 states have internal predecessors, (110), 15 states have call successors, (15), 11 states have call predecessors, (15), 9 states have return successors, (37), 17 states have call predecessors, (37), 14 states have call successors, (37) [2023-11-12 00:57:20,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 162 transitions. [2023-11-12 00:57:20,885 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 162 transitions. Word has length 458 [2023-11-12 00:57:20,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:20,886 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 162 transitions. [2023-11-12 00:57:20,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2023-11-12 00:57:20,887 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 162 transitions. [2023-11-12 00:57:20,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2023-11-12 00:57:20,891 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:20,892 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 10, 6, 1, 1, 1, 1] [2023-11-12 00:57:20,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:21,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-12 00:57:21,098 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:21,099 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:21,099 INFO L85 PathProgramCache]: Analyzing trace with hash 599782142, now seen corresponding path program 8 times [2023-11-12 00:57:21,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:21,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767310383] [2023-11-12 00:57:21,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:21,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:21,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:21,796 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 522 proven. 990 refuted. 0 times theorem prover too weak. 1638 trivial. 0 not checked. [2023-11-12 00:57:21,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:21,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767310383] [2023-11-12 00:57:21,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767310383] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:21,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397540400] [2023-11-12 00:57:21,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:57:21,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:21,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:21,798 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:21,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 00:57:21,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-11-12 00:57:21,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:21,979 INFO L262 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:57:21,985 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:22,190 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 785 proven. 527 refuted. 0 times theorem prover too weak. 1838 trivial. 0 not checked. [2023-11-12 00:57:22,190 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:23,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 793 proven. 552 refuted. 0 times theorem prover too weak. 1805 trivial. 0 not checked. [2023-11-12 00:57:23,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397540400] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:23,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878239529] [2023-11-12 00:57:23,469 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:23,469 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:23,471 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:23,472 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:23,472 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 17] total 27 [2023-11-12 00:57:23,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858101524] [2023-11-12 00:57:23,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:23,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:57:23,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:23,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:57:23,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2023-11-12 00:57:23,477 INFO L87 Difference]: Start difference. First operand 130 states and 162 transitions. Second operand has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2023-11-12 00:57:23,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:23,986 INFO L93 Difference]: Finished difference Result 257 states and 345 transitions. [2023-11-12 00:57:23,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-12 00:57:23,987 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) Word has length 300 [2023-11-12 00:57:23,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:23,989 INFO L225 Difference]: With dead ends: 257 [2023-11-12 00:57:23,990 INFO L226 Difference]: Without dead ends: 132 [2023-11-12 00:57:23,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 585 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=427, Invalid=1295, Unknown=0, NotChecked=0, Total=1722 [2023-11-12 00:57:23,992 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 116 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:23,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 190 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:57:23,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-12 00:57:24,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 112. [2023-11-12 00:57:24,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 88 states have internal predecessors, (93), 14 states have call successors, (14), 11 states have call predecessors, (14), 7 states have return successors, (28), 12 states have call predecessors, (28), 13 states have call successors, (28) [2023-11-12 00:57:24,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 135 transitions. [2023-11-12 00:57:24,021 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 135 transitions. Word has length 300 [2023-11-12 00:57:24,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:24,022 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 135 transitions. [2023-11-12 00:57:24,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2023-11-12 00:57:24,022 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 135 transitions. [2023-11-12 00:57:24,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 753 [2023-11-12 00:57:24,042 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:24,043 INFO L195 NwaCegarLoop]: trace histogram [78, 75, 63, 39, 39, 39, 39, 38, 38, 38, 38, 38, 37, 37, 37, 36, 24, 15, 1, 1, 1, 1] [2023-11-12 00:57:24,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:24,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:24,249 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:24,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:24,250 INFO L85 PathProgramCache]: Analyzing trace with hash 786808711, now seen corresponding path program 9 times [2023-11-12 00:57:24,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:24,250 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110815934] [2023-11-12 00:57:24,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:24,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:24,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:26,134 INFO L134 CoverageAnalysis]: Checked inductivity of 20542 backedges. 1219 proven. 4435 refuted. 0 times theorem prover too weak. 14888 trivial. 0 not checked. [2023-11-12 00:57:26,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:26,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110815934] [2023-11-12 00:57:26,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110815934] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:26,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034028539] [2023-11-12 00:57:26,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:57:26,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:26,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:26,137 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:26,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-12 00:57:26,391 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:57:26,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:57:26,396 INFO L262 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-12 00:57:26,421 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:26,682 INFO L134 CoverageAnalysis]: Checked inductivity of 20542 backedges. 10492 proven. 2732 refuted. 0 times theorem prover too weak. 7318 trivial. 0 not checked. [2023-11-12 00:57:26,682 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:29,611 INFO L134 CoverageAnalysis]: Checked inductivity of 20542 backedges. 1482 proven. 5273 refuted. 0 times theorem prover too weak. 13787 trivial. 0 not checked. [2023-11-12 00:57:29,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034028539] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:29,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [724764295] [2023-11-12 00:57:29,614 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:57:29,614 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:29,614 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:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:416) 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:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-12 00:57:29,615 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:29,616 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 26] total 31 [2023-11-12 00:57:29,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86723218] [2023-11-12 00:57:29,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:29,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-12 00:57:29,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:29,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-12 00:57:29,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=777, Unknown=0, NotChecked=0, Total=930 [2023-11-12 00:57:29,621 INFO L87 Difference]: Start difference. First operand 112 states and 135 transitions. Second operand has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) [2023-11-12 00:57:30,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:30,362 INFO L93 Difference]: Finished difference Result 267 states and 347 transitions. [2023-11-12 00:57:30,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-11-12 00:57:30,363 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) Word has length 752 [2023-11-12 00:57:30,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:30,367 INFO L225 Difference]: With dead ends: 267 [2023-11-12 00:57:30,367 INFO L226 Difference]: Without dead ends: 160 [2023-11-12 00:57:30,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1557 GetRequests, 1486 SyntacticMatches, 14 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=861, Invalid=2561, Unknown=0, NotChecked=0, Total=3422 [2023-11-12 00:57:30,370 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 481 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:30,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 127 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:57:30,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-11-12 00:57:30,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 124. [2023-11-12 00:57:30,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 98 states have internal predecessors, (102), 16 states have call successors, (16), 12 states have call predecessors, (16), 8 states have return successors, (35), 13 states have call predecessors, (35), 15 states have call successors, (35) [2023-11-12 00:57:30,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2023-11-12 00:57:30,385 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 752 [2023-11-12 00:57:30,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:30,386 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2023-11-12 00:57:30,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 6.0) internal successors, (186), 31 states have internal predecessors, (186), 26 states have call successors, (33), 3 states have call predecessors, (33), 13 states have return successors, (40), 15 states have call predecessors, (40), 25 states have call successors, (40) [2023-11-12 00:57:30,386 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2023-11-12 00:57:30,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2023-11-12 00:57:30,394 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:30,395 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 13, 8, 1, 1, 1, 1] [2023-11-12 00:57:30,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:30,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-12 00:57:30,601 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-12 00:57:30,602 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:30,602 INFO L85 PathProgramCache]: Analyzing trace with hash -2103483039, now seen corresponding path program 10 times [2023-11-12 00:57:30,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:30,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692260054] [2023-11-12 00:57:30,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:30,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:30,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:33,848 INFO L134 CoverageAnalysis]: Checked inductivity of 5628 backedges. 830 proven. 1470 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2023-11-12 00:57:33,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:33,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692260054] [2023-11-12 00:57:33,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692260054] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:33,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923062004] [2023-11-12 00:57:33,849 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:57:33,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:33,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:33,852 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:33,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5ec411a-bdfe-43b0-a8f7-891d4806e21b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-12 00:57:34,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:34,106 INFO L262 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 81 conjunts are in the unsatisfiable core [2023-11-12 00:57:34,114 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:34,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5628 backedges. 820 proven. 1112 refuted. 0 times theorem prover too weak. 3696 trivial. 0 not checked. [2023-11-12 00:57:34,647 INFO L327 TraceCheckSpWp]: Computing backward predicates...