./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 30e01a73 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_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire --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 c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:35:18,308 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:35:18,431 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-11-23 20:35:18,444 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:35:18,445 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:35:18,498 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:35:18,499 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:35:18,499 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:35:18,503 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:35:18,509 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:35:18,509 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:35:18,510 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:35:18,511 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:35:18,513 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:35:18,513 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:35:18,514 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:35:18,514 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:35:18,515 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:35:18,515 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:35:18,516 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:35:18,517 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:35:18,518 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:35:18,519 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:35:18,520 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:35:18,520 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:35:18,521 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:35:18,521 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:35:18,522 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:35:18,522 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:35:18,523 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:35:18,525 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:35:18,525 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-23 20:35:18,525 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 20:35:18,526 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:35:18,526 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:35:18,526 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:35:18,527 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:35:18,527 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:35:18,528 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:35:18,528 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:35:18,528 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:35:18,529 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:35:18,529 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:35:18,529 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:35:18,530 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:35:18,530 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:35:18,531 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:35:18,531 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:35:18,531 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:35:18,532 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_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2023-11-23 20:35:18,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:35:18,946 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:35:18,949 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:35:18,951 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:35:18,951 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:35:18,952 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/recursive/Ackermann03.c [2023-11-23 20:35:22,182 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:35:22,409 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:35:22,410 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/sv-benchmarks/c/recursive/Ackermann03.c [2023-11-23 20:35:22,418 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/data/3b1b072f5/1f4bc87f0003477cbd63ff54afa87994/FLAG8f12bd68c [2023-11-23 20:35:22,436 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/data/3b1b072f5/1f4bc87f0003477cbd63ff54afa87994 [2023-11-23 20:35:22,439 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:35:22,441 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:35:22,442 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:35:22,443 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:35:22,449 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:35:22,450 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,452 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a1be324 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22, skipping insertion in model container [2023-11-23 20:35:22,452 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,477 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:35:22,652 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:35:22,667 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:35:22,688 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:35:22,707 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:35:22,707 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22 WrapperNode [2023-11-23 20:35:22,708 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:35:22,709 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:35:22,710 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:35:22,710 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:35:22,720 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,728 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,750 INFO L138 Inliner]: procedures = 13, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2023-11-23 20:35:22,751 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:35:22,752 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:35:22,752 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:35:22,752 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:35:22,765 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,766 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,767 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,768 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,772 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,774 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,776 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,777 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,779 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:35:22,780 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:35:22,781 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:35:22,781 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:35:22,782 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (1/1) ... [2023-11-23 20:35:22,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:35:22,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:22,841 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:35:22,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:35:22,889 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:35:22,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:35:22,889 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:35:22,889 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2023-11-23 20:35:22,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2023-11-23 20:35:22,902 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:35:22,976 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:35:22,978 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:35:23,167 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:35:23,202 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:35:23,203 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-23 20:35:23,205 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:35:23 BoogieIcfgContainer [2023-11-23 20:35:23,205 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:35:23,209 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:35:23,209 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:35:23,213 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:35:23,214 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:35:22" (1/3) ... [2023-11-23 20:35:23,215 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24454316 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:35:23, skipping insertion in model container [2023-11-23 20:35:23,215 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:22" (2/3) ... [2023-11-23 20:35:23,216 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24454316 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:35:23, skipping insertion in model container [2023-11-23 20:35:23,216 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:35:23" (3/3) ... [2023-11-23 20:35:23,218 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2023-11-23 20:35:23,241 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:35:23,242 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-11-23 20:35:23,301 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:35:23,310 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;@a21104b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:35:23,310 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-11-23 20:35:23,315 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:35:23,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 20:35:23,324 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:23,325 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:23,326 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:23,332 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:23,333 INFO L85 PathProgramCache]: Analyzing trace with hash -2118177911, now seen corresponding path program 1 times [2023-11-23 20:35:23,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:23,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135101332] [2023-11-23 20:35:23,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:23,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:23,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:23,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:23,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135101332] [2023-11-23 20:35:23,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135101332] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:23,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:23,721 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:35:23,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110453199] [2023-11-23 20:35:23,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:23,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:35:23,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:23,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:35:23,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:23,812 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:24,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:24,069 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2023-11-23 20:35:24,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:35:24,073 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 20:35:24,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:24,088 INFO L225 Difference]: With dead ends: 64 [2023-11-23 20:35:24,088 INFO L226 Difference]: Without dead ends: 58 [2023-11-23 20:35:24,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:24,100 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 50 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:24,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 101 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:24,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-23 20:35:24,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2023-11-23 20:35:24,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 41 states have internal predecessors, (51), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 20:35:24,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2023-11-23 20:35:24,163 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2023-11-23 20:35:24,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:24,164 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2023-11-23 20:35:24,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:24,165 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2023-11-23 20:35:24,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 20:35:24,165 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:24,166 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:24,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:35:24,167 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:24,167 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:24,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1239000740, now seen corresponding path program 1 times [2023-11-23 20:35:24,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:24,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077708246] [2023-11-23 20:35:24,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:24,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:24,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:24,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:24,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:24,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077708246] [2023-11-23 20:35:24,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077708246] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:24,326 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:24,327 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:35:24,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391555778] [2023-11-23 20:35:24,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:24,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:35:24,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:24,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:35:24,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:24,337 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.75) 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) [2023-11-23 20:35:24,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:24,434 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2023-11-23 20:35:24,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:35:24,435 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) 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 [2023-11-23 20:35:24,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:24,438 INFO L225 Difference]: With dead ends: 100 [2023-11-23 20:35:24,438 INFO L226 Difference]: Without dead ends: 94 [2023-11-23 20:35:24,439 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 [2023-11-23 20:35:24,441 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:24,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 92 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:24,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-23 20:35:24,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2023-11-23 20:35:24,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 69 states have internal predecessors, (91), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-23 20:35:24,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 114 transitions. [2023-11-23 20:35:24,467 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 114 transitions. Word has length 8 [2023-11-23 20:35:24,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:24,467 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 114 transitions. [2023-11-23 20:35:24,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) 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) [2023-11-23 20:35:24,468 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 114 transitions. [2023-11-23 20:35:24,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 20:35:24,469 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:24,469 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:24,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:35:24,470 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:24,471 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:24,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1239005737, now seen corresponding path program 1 times [2023-11-23 20:35:24,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:24,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366154607] [2023-11-23 20:35:24,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:24,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:24,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:24,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:24,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366154607] [2023-11-23 20:35:24,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366154607] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:24,586 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:24,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:35:24,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7997264] [2023-11-23 20:35:24,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:24,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:35:24,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:24,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:35:24,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:24,591 INFO L87 Difference]: Start difference. First operand 84 states and 114 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) [2023-11-23 20:35:24,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:24,782 INFO L93 Difference]: Finished difference Result 113 states and 151 transitions. [2023-11-23 20:35:24,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:35:24,783 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 [2023-11-23 20:35:24,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:24,786 INFO L225 Difference]: With dead ends: 113 [2023-11-23 20:35:24,787 INFO L226 Difference]: Without dead ends: 109 [2023-11-23 20:35:24,788 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 [2023-11-23 20:35:24,790 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 49 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:24,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 86 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:24,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-23 20:35:24,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 101. [2023-11-23 20:35:24,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 73 states have (on average 1.452054794520548) internal successors, (106), 82 states have internal predecessors, (106), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-23 20:35:24,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 135 transitions. [2023-11-23 20:35:24,817 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 135 transitions. Word has length 8 [2023-11-23 20:35:24,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:24,818 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 135 transitions. [2023-11-23 20:35:24,818 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) [2023-11-23 20:35:24,818 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 135 transitions. [2023-11-23 20:35:24,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:35:24,819 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:24,819 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:24,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:35:24,820 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:24,821 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:24,821 INFO L85 PathProgramCache]: Analyzing trace with hash 245682796, now seen corresponding path program 1 times [2023-11-23 20:35:24,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:24,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278391128] [2023-11-23 20:35:24,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:24,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:24,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:24,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:24,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:24,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278391128] [2023-11-23 20:35:24,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278391128] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:24,902 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:24,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:35:24,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015212703] [2023-11-23 20:35:24,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:24,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:35:24,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:24,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:35:24,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:24,909 INFO L87 Difference]: Start difference. First operand 101 states and 135 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-23 20:35:25,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:25,045 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2023-11-23 20:35:25,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:35:25,046 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 9 [2023-11-23 20:35:25,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:25,054 INFO L225 Difference]: With dead ends: 101 [2023-11-23 20:35:25,054 INFO L226 Difference]: Without dead ends: 99 [2023-11-23 20:35:25,055 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 [2023-11-23 20:35:25,066 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:25,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:25,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-23 20:35:25,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-23 20:35:25,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.3150684931506849) internal successors, (96), 80 states have internal predecessors, (96), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-23 20:35:25,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2023-11-23 20:35:25,102 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2023-11-23 20:35:25,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:25,102 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2023-11-23 20:35:25,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-23 20:35:25,102 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2023-11-23 20:35:25,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 20:35:25,103 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:25,103 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:25,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:35:25,104 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:25,104 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:25,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410727, now seen corresponding path program 1 times [2023-11-23 20:35:25,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:25,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454964239] [2023-11-23 20:35:25,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:25,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:25,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:25,213 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:25,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:25,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454964239] [2023-11-23 20:35:25,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454964239] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:25,216 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:25,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:35:25,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682766980] [2023-11-23 20:35:25,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:25,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:35:25,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:25,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:35:25,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:35:25,219 INFO L87 Difference]: Start difference. First operand 99 states and 125 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:25,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:25,328 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2023-11-23 20:35:25,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:35:25,331 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 20:35:25,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:25,332 INFO L225 Difference]: With dead ends: 167 [2023-11-23 20:35:25,333 INFO L226 Difference]: Without dead ends: 96 [2023-11-23 20:35:25,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:25,340 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 26 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:25,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 82 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:25,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-11-23 20:35:25,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2023-11-23 20:35:25,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.3) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-23 20:35:25,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2023-11-23 20:35:25,376 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 14 [2023-11-23 20:35:25,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:25,378 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2023-11-23 20:35:25,378 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:25,378 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2023-11-23 20:35:25,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 20:35:25,379 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:25,379 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:25,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 20:35:25,380 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:25,381 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:25,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410503, now seen corresponding path program 1 times [2023-11-23 20:35:25,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:25,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263898873] [2023-11-23 20:35:25,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:25,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:25,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:25,510 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:25,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:25,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263898873] [2023-11-23 20:35:25,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263898873] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:25,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247405657] [2023-11-23 20:35:25,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:25,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:25,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:25,515 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:25,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:35:25,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:25,584 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:35:25,591 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:25,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:25,710 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:25,841 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:25,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247405657] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:25,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602366349] [2023-11-23 20:35:25,871 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:25,871 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:25,877 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:25,884 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:25,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-23 20:35:25,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689244816] [2023-11-23 20:35:25,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:25,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 20:35:25,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:25,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 20:35:25,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:25,897 INFO L87 Difference]: Start difference. First operand 95 states and 118 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:26,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:26,299 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2023-11-23 20:35:26,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 20:35:26,300 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 20:35:26,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:26,310 INFO L225 Difference]: With dead ends: 273 [2023-11-23 20:35:26,310 INFO L226 Difference]: Without dead ends: 271 [2023-11-23 20:35:26,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-11-23 20:35:26,314 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 308 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:26,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 175 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:26,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2023-11-23 20:35:26,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2023-11-23 20:35:26,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 181 states have (on average 1.2651933701657458) internal successors, (229), 188 states have internal predecessors, (229), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2023-11-23 20:35:26,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2023-11-23 20:35:26,405 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 14 [2023-11-23 20:35:26,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:26,406 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2023-11-23 20:35:26,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:26,406 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2023-11-23 20:35:26,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 20:35:26,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:26,408 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:26,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 20:35:26,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:26,617 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:26,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:26,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1750564749, now seen corresponding path program 1 times [2023-11-23 20:35:26,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:26,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131586381] [2023-11-23 20:35:26,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:26,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:26,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:26,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:26,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:26,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131586381] [2023-11-23 20:35:26,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131586381] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:26,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421216622] [2023-11-23 20:35:26,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:26,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:26,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:26,721 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:26,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:35:26,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:26,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:35:26,772 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:26,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:26,808 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:26,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:26,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421216622] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:26,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1062702779] [2023-11-23 20:35:26,905 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 20:35:26,905 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:26,905 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:26,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:26,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-23 20:35:26,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087948849] [2023-11-23 20:35:26,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:26,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 20:35:26,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:26,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 20:35:26,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:26,909 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:27,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:27,270 INFO L93 Difference]: Finished difference Result 511 states and 694 transitions. [2023-11-23 20:35:27,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-23 20:35:27,270 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-23 20:35:27,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:27,277 INFO L225 Difference]: With dead ends: 511 [2023-11-23 20:35:27,278 INFO L226 Difference]: Without dead ends: 509 [2023-11-23 20:35:27,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=264, Unknown=0, NotChecked=0, Total=380 [2023-11-23 20:35:27,280 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 205 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:27,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 141 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:27,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2023-11-23 20:35:27,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 444. [2023-11-23 20:35:27,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 346 states have (on average 1.2283236994219653) internal successors, (425), 353 states have internal predecessors, (425), 69 states have call successors, (69), 24 states have call predecessors, (69), 23 states have return successors, (66), 66 states have call predecessors, (66), 66 states have call successors, (66) [2023-11-23 20:35:27,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 560 transitions. [2023-11-23 20:35:27,373 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 560 transitions. Word has length 15 [2023-11-23 20:35:27,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:27,375 INFO L495 AbstractCegarLoop]: Abstraction has 444 states and 560 transitions. [2023-11-23 20:35:27,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:27,375 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 560 transitions. [2023-11-23 20:35:27,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 20:35:27,378 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:27,378 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:27,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:27,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:27,607 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:27,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:27,608 INFO L85 PathProgramCache]: Analyzing trace with hash 244799614, now seen corresponding path program 1 times [2023-11-23 20:35:27,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:27,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540922697] [2023-11-23 20:35:27,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:27,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:27,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:27,738 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:35:27,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:27,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540922697] [2023-11-23 20:35:27,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540922697] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:27,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818544895] [2023-11-23 20:35:27,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:27,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:27,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:27,741 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:27,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:35:27,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:27,793 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:35:27,795 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:27,886 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:35:27,886 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:27,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818544895] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:27,887 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:27,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 12 [2023-11-23 20:35:27,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399797585] [2023-11-23 20:35:27,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:27,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:35:27,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:27,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:35:27,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2023-11-23 20:35:27,890 INFO L87 Difference]: Start difference. First operand 444 states and 560 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 20:35:28,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:28,100 INFO L93 Difference]: Finished difference Result 477 states and 599 transitions. [2023-11-23 20:35:28,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:35:28,101 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2023-11-23 20:35:28,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:28,105 INFO L225 Difference]: With dead ends: 477 [2023-11-23 20:35:28,106 INFO L226 Difference]: Without dead ends: 476 [2023-11-23 20:35:28,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2023-11-23 20:35:28,107 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 65 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:28,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 118 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:28,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2023-11-23 20:35:28,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 443. [2023-11-23 20:35:28,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 346 states have (on average 1.216763005780347) internal successors, (421), 352 states have internal predecessors, (421), 69 states have call successors, (69), 24 states have call predecessors, (69), 23 states have return successors, (66), 66 states have call predecessors, (66), 66 states have call successors, (66) [2023-11-23 20:35:28,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 556 transitions. [2023-11-23 20:35:28,165 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 556 transitions. Word has length 23 [2023-11-23 20:35:28,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:28,166 INFO L495 AbstractCegarLoop]: Abstraction has 443 states and 556 transitions. [2023-11-23 20:35:28,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 20:35:28,166 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 556 transitions. [2023-11-23 20:35:28,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:35:28,168 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:28,168 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] [2023-11-23 20:35:28,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:28,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:28,393 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:28,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:28,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1001146494, now seen corresponding path program 1 times [2023-11-23 20:35:28,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:28,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135772067] [2023-11-23 20:35:28,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:28,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:28,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:28,517 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:35:28,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:28,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135772067] [2023-11-23 20:35:28,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135772067] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:28,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224128834] [2023-11-23 20:35:28,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:28,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:28,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:28,519 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:28,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:35:28,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:28,576 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 20:35:28,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:28,629 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:35:28,629 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:28,863 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:35:28,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224128834] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:28,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446283946] [2023-11-23 20:35:28,867 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 20:35:28,867 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:28,868 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:28,869 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:28,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-11-23 20:35:28,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5029925] [2023-11-23 20:35:28,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:28,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 20:35:28,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:28,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 20:35:28,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2023-11-23 20:35:28,873 INFO L87 Difference]: Start difference. First operand 443 states and 556 transitions. Second operand has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:29,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:29,239 INFO L93 Difference]: Finished difference Result 726 states and 1018 transitions. [2023-11-23 20:35:29,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:35:29,240 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-11-23 20:35:29,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:29,247 INFO L225 Difference]: With dead ends: 726 [2023-11-23 20:35:29,247 INFO L226 Difference]: Without dead ends: 724 [2023-11-23 20:35:29,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-23 20:35:29,252 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 140 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:29,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 102 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:29,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2023-11-23 20:35:29,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 654. [2023-11-23 20:35:29,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 654 states, 490 states have (on average 1.2) internal successors, (588), 511 states have internal predecessors, (588), 114 states have call successors, (114), 31 states have call predecessors, (114), 45 states have return successors, (134), 111 states have call predecessors, (134), 110 states have call successors, (134) [2023-11-23 20:35:29,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 654 states to 654 states and 836 transitions. [2023-11-23 20:35:29,371 INFO L78 Accepts]: Start accepts. Automaton has 654 states and 836 transitions. Word has length 24 [2023-11-23 20:35:29,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:29,372 INFO L495 AbstractCegarLoop]: Abstraction has 654 states and 836 transitions. [2023-11-23 20:35:29,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:29,373 INFO L276 IsEmpty]: Start isEmpty. Operand 654 states and 836 transitions. [2023-11-23 20:35:29,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 20:35:29,379 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:29,379 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 20:35:29,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:29,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:29,589 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:29,589 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:29,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1126474954, now seen corresponding path program 1 times [2023-11-23 20:35:29,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:29,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125912424] [2023-11-23 20:35:29,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:29,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:29,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:29,711 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:29,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:29,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125912424] [2023-11-23 20:35:29,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125912424] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:29,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070520637] [2023-11-23 20:35:29,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:29,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:29,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:29,714 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:29,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:35:29,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:29,768 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:35:29,769 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:29,812 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:29,813 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:29,939 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:29,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070520637] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:29,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696469198] [2023-11-23 20:35:29,942 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 20:35:29,942 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:29,943 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:29,944 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:29,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-11-23 20:35:29,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147072589] [2023-11-23 20:35:29,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:29,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 20:35:29,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:29,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 20:35:29,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2023-11-23 20:35:29,947 INFO L87 Difference]: Start difference. First operand 654 states and 836 transitions. Second operand has 16 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 10 states have internal predecessors, (44), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:30,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:30,450 INFO L93 Difference]: Finished difference Result 1030 states and 1437 transitions. [2023-11-23 20:35:30,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 20:35:30,451 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 10 states have internal predecessors, (44), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-11-23 20:35:30,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:30,460 INFO L225 Difference]: With dead ends: 1030 [2023-11-23 20:35:30,460 INFO L226 Difference]: Without dead ends: 1029 [2023-11-23 20:35:30,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=214, Invalid=488, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:35:30,462 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 321 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:30,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 200 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:30,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1029 states. [2023-11-23 20:35:30,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1029 to 930. [2023-11-23 20:35:30,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 930 states, 694 states have (on average 1.1700288184438041) internal successors, (812), 727 states have internal predecessors, (812), 162 states have call successors, (162), 43 states have call predecessors, (162), 69 states have return successors, (194), 159 states have call predecessors, (194), 158 states have call successors, (194) [2023-11-23 20:35:30,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 930 states to 930 states and 1168 transitions. [2023-11-23 20:35:30,584 INFO L78 Accepts]: Start accepts. Automaton has 930 states and 1168 transitions. Word has length 26 [2023-11-23 20:35:30,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:30,585 INFO L495 AbstractCegarLoop]: Abstraction has 930 states and 1168 transitions. [2023-11-23 20:35:30,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 10 states have internal predecessors, (44), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:30,585 INFO L276 IsEmpty]: Start isEmpty. Operand 930 states and 1168 transitions. [2023-11-23 20:35:30,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 20:35:30,586 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:30,586 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:30,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:30,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 20:35:30,805 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:30,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:30,806 INFO L85 PathProgramCache]: Analyzing trace with hash -24086519, now seen corresponding path program 1 times [2023-11-23 20:35:30,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:30,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421105884] [2023-11-23 20:35:30,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:30,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:30,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:30,927 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:30,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:30,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421105884] [2023-11-23 20:35:30,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421105884] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:30,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028382976] [2023-11-23 20:35:30,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:30,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:30,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:30,929 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:30,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:35:30,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:30,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 20:35:30,988 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:31,039 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:31,039 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:31,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028382976] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:31,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1968402314] [2023-11-23 20:35:31,226 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 20:35:31,227 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:31,227 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:31,228 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:31,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-11-23 20:35:31,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020930103] [2023-11-23 20:35:31,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:31,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 20:35:31,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:31,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 20:35:31,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2023-11-23 20:35:31,234 INFO L87 Difference]: Start difference. First operand 930 states and 1168 transitions. Second operand has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:31,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:31,801 INFO L93 Difference]: Finished difference Result 1351 states and 1908 transitions. [2023-11-23 20:35:31,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-23 20:35:31,802 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-11-23 20:35:31,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:31,814 INFO L225 Difference]: With dead ends: 1351 [2023-11-23 20:35:31,814 INFO L226 Difference]: Without dead ends: 1341 [2023-11-23 20:35:31,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=458, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:35:31,817 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 192 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:31,818 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 129 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:35:31,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1341 states. [2023-11-23 20:35:31,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1341 to 1160. [2023-11-23 20:35:31,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1160 states, 862 states have (on average 1.165893271461717) internal successors, (1005), 902 states have internal predecessors, (1005), 209 states have call successors, (209), 53 states have call predecessors, (209), 84 states have return successors, (255), 204 states have call predecessors, (255), 202 states have call successors, (255) [2023-11-23 20:35:32,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1469 transitions. [2023-11-23 20:35:32,016 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1469 transitions. Word has length 26 [2023-11-23 20:35:32,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:32,016 INFO L495 AbstractCegarLoop]: Abstraction has 1160 states and 1469 transitions. [2023-11-23 20:35:32,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:32,017 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1469 transitions. [2023-11-23 20:35:32,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:35:32,019 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:32,020 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:32,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:32,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:32,233 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:32,233 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:32,233 INFO L85 PathProgramCache]: Analyzing trace with hash -1210732047, now seen corresponding path program 1 times [2023-11-23 20:35:32,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:32,234 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540665605] [2023-11-23 20:35:32,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:32,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:32,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:32,442 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:32,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:32,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540665605] [2023-11-23 20:35:32,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540665605] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:32,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853037911] [2023-11-23 20:35:32,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:32,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:32,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:32,445 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:32,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:35:32,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:32,507 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 20:35:32,511 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:32,564 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:32,564 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:32,812 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:32,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853037911] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:32,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532851334] [2023-11-23 20:35:32,815 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-23 20:35:32,816 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:32,816 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:32,817 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:32,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-11-23 20:35:32,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455659387] [2023-11-23 20:35:32,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:32,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-23 20:35:32,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:32,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-23 20:35:32,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:35:32,820 INFO L87 Difference]: Start difference. First operand 1160 states and 1469 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-23 20:35:33,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:33,667 INFO L93 Difference]: Finished difference Result 2133 states and 3473 transitions. [2023-11-23 20:35:33,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 20:35:33,668 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) Word has length 33 [2023-11-23 20:35:33,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:33,688 INFO L225 Difference]: With dead ends: 2133 [2023-11-23 20:35:33,688 INFO L226 Difference]: Without dead ends: 2095 [2023-11-23 20:35:33,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2023-11-23 20:35:33,692 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 155 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:33,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 174 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:35:33,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2095 states. [2023-11-23 20:35:33,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2095 to 1762. [2023-11-23 20:35:33,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1762 states, 1264 states have (on average 1.1526898734177216) internal successors, (1457), 1324 states have internal predecessors, (1457), 338 states have call successors, (338), 73 states have call predecessors, (338), 155 states have return successors, (724), 364 states have call predecessors, (724), 323 states have call successors, (724) [2023-11-23 20:35:34,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1762 states to 1762 states and 2519 transitions. [2023-11-23 20:35:34,022 INFO L78 Accepts]: Start accepts. Automaton has 1762 states and 2519 transitions. Word has length 33 [2023-11-23 20:35:34,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:34,023 INFO L495 AbstractCegarLoop]: Abstraction has 1762 states and 2519 transitions. [2023-11-23 20:35:34,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-23 20:35:34,023 INFO L276 IsEmpty]: Start isEmpty. Operand 1762 states and 2519 transitions. [2023-11-23 20:35:34,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 20:35:34,025 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:34,025 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:34,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:34,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-23 20:35:34,241 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:34,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:34,241 INFO L85 PathProgramCache]: Analyzing trace with hash 427659960, now seen corresponding path program 1 times [2023-11-23 20:35:34,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:34,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251541710] [2023-11-23 20:35:34,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:34,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:34,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:34,412 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:34,413 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:34,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251541710] [2023-11-23 20:35:34,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251541710] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:34,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87395440] [2023-11-23 20:35:34,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:34,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:34,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:34,415 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:34,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:35:34,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:34,476 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 20:35:34,479 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:34,540 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:34,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:34,781 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:34,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87395440] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:34,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:35:34,782 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2023-11-23 20:35:34,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138056606] [2023-11-23 20:35:34,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:34,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:35:34,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:34,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:35:34,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:35:34,784 INFO L87 Difference]: Start difference. First operand 1762 states and 2519 transitions. Second operand has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:35:35,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:35,315 INFO L93 Difference]: Finished difference Result 1939 states and 2971 transitions. [2023-11-23 20:35:35,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:35:35,316 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2023-11-23 20:35:35,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:35,340 INFO L225 Difference]: With dead ends: 1939 [2023-11-23 20:35:35,340 INFO L226 Difference]: Without dead ends: 1938 [2023-11-23 20:35:35,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2023-11-23 20:35:35,344 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 65 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:35,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 154 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:35,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1938 states. [2023-11-23 20:35:35,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1938 to 1770. [2023-11-23 20:35:35,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1770 states, 1272 states have (on average 1.14937106918239) internal successors, (1462), 1328 states have internal predecessors, (1462), 342 states have call successors, (342), 73 states have call predecessors, (342), 151 states have return successors, (596), 368 states have call predecessors, (596), 327 states have call successors, (596) [2023-11-23 20:35:35,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1770 states to 1770 states and 2400 transitions. [2023-11-23 20:35:35,679 INFO L78 Accepts]: Start accepts. Automaton has 1770 states and 2400 transitions. Word has length 35 [2023-11-23 20:35:35,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:35,680 INFO L495 AbstractCegarLoop]: Abstraction has 1770 states and 2400 transitions. [2023-11-23 20:35:35,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:35:35,681 INFO L276 IsEmpty]: Start isEmpty. Operand 1770 states and 2400 transitions. [2023-11-23 20:35:35,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-23 20:35:35,684 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:35,684 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:35,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:35,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-23 20:35:35,902 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:35,902 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:35,902 INFO L85 PathProgramCache]: Analyzing trace with hash 965988533, now seen corresponding path program 2 times [2023-11-23 20:35:35,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:35,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616665656] [2023-11-23 20:35:35,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:35,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:35,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:36,133 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:35:36,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:36,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616665656] [2023-11-23 20:35:36,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616665656] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:36,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282610477] [2023-11-23 20:35:36,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:36,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:36,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:36,136 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:36,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:35:36,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-23 20:35:36,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:36,203 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-23 20:35:36,208 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:36,294 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:35:36,294 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:36,589 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 38 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:35:36,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282610477] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:36,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140011455] [2023-11-23 20:35:36,593 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 20:35:36,593 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:36,594 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:36,595 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:36,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-11-23 20:35:36,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592688630] [2023-11-23 20:35:36,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:36,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-23 20:35:36,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:36,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-23 20:35:36,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2023-11-23 20:35:36,599 INFO L87 Difference]: Start difference. First operand 1770 states and 2400 transitions. Second operand has 22 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 16 states have internal predecessors, (56), 8 states have call successors, (10), 7 states have call predecessors, (10), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:37,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:37,817 INFO L93 Difference]: Finished difference Result 2841 states and 4278 transitions. [2023-11-23 20:35:37,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-11-23 20:35:37,818 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 16 states have internal predecessors, (56), 8 states have call successors, (10), 7 states have call predecessors, (10), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 42 [2023-11-23 20:35:37,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:37,847 INFO L225 Difference]: With dead ends: 2841 [2023-11-23 20:35:37,847 INFO L226 Difference]: Without dead ends: 2840 [2023-11-23 20:35:37,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=548, Invalid=1708, Unknown=0, NotChecked=0, Total=2256 [2023-11-23 20:35:37,851 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 432 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:37,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 225 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:35:37,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2840 states. [2023-11-23 20:35:38,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2840 to 2614. [2023-11-23 20:35:38,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2614 states, 1873 states have (on average 1.1409503470368394) internal successors, (2137), 1970 states have internal predecessors, (2137), 498 states have call successors, (498), 107 states have call predecessors, (498), 238 states have return successors, (922), 536 states have call predecessors, (922), 483 states have call successors, (922) [2023-11-23 20:35:38,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2614 states to 2614 states and 3557 transitions. [2023-11-23 20:35:38,265 INFO L78 Accepts]: Start accepts. Automaton has 2614 states and 3557 transitions. Word has length 42 [2023-11-23 20:35:38,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:38,266 INFO L495 AbstractCegarLoop]: Abstraction has 2614 states and 3557 transitions. [2023-11-23 20:35:38,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 16 states have internal predecessors, (56), 8 states have call successors, (10), 7 states have call predecessors, (10), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:35:38,266 INFO L276 IsEmpty]: Start isEmpty. Operand 2614 states and 3557 transitions. [2023-11-23 20:35:38,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 20:35:38,269 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:38,269 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:38,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:38,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 20:35:38,494 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:38,494 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:38,494 INFO L85 PathProgramCache]: Analyzing trace with hash 798745486, now seen corresponding path program 2 times [2023-11-23 20:35:38,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:38,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578241119] [2023-11-23 20:35:38,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:38,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:38,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:38,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:38,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578241119] [2023-11-23 20:35:38,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578241119] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:38,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043249661] [2023-11-23 20:35:38,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:38,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:38,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:38,668 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:38,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 20:35:38,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-23 20:35:38,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:38,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 20:35:38,733 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:38,848 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:38,848 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:39,015 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:35:39,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043249661] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:39,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602570886] [2023-11-23 20:35:39,022 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-23 20:35:39,022 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:39,023 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:39,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:39,026 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 8] total 18 [2023-11-23 20:35:39,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042841490] [2023-11-23 20:35:39,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:39,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-23 20:35:39,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:39,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-23 20:35:39,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:35:39,030 INFO L87 Difference]: Start difference. First operand 2614 states and 3557 transitions. Second operand has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:35:40,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:40,388 INFO L93 Difference]: Finished difference Result 5279 states and 8835 transitions. [2023-11-23 20:35:40,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 20:35:40,389 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 43 [2023-11-23 20:35:40,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:40,422 INFO L225 Difference]: With dead ends: 5279 [2023-11-23 20:35:40,422 INFO L226 Difference]: Without dead ends: 3233 [2023-11-23 20:35:40,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=273, Invalid=987, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 20:35:40,460 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 159 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:40,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 118 Invalid, 662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:35:40,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3233 states. [2023-11-23 20:35:40,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3233 to 2955. [2023-11-23 20:35:40,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2955 states, 2059 states have (on average 1.10247693054881) internal successors, (2270), 2106 states have internal predecessors, (2270), 545 states have call successors, (545), 105 states have call predecessors, (545), 346 states have return successors, (1302), 743 states have call predecessors, (1302), 511 states have call successors, (1302) [2023-11-23 20:35:40,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2955 states to 2955 states and 4117 transitions. [2023-11-23 20:35:40,995 INFO L78 Accepts]: Start accepts. Automaton has 2955 states and 4117 transitions. Word has length 43 [2023-11-23 20:35:40,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:40,995 INFO L495 AbstractCegarLoop]: Abstraction has 2955 states and 4117 transitions. [2023-11-23 20:35:40,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:35:40,996 INFO L276 IsEmpty]: Start isEmpty. Operand 2955 states and 4117 transitions. [2023-11-23 20:35:41,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 20:35:41,001 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:41,001 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:41,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:41,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-23 20:35:41,214 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:41,214 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:41,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1295270540, now seen corresponding path program 1 times [2023-11-23 20:35:41,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:41,215 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697610687] [2023-11-23 20:35:41,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:41,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:41,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:41,348 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:35:41,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:41,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697610687] [2023-11-23 20:35:41,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697610687] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:41,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660984363] [2023-11-23 20:35:41,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:41,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:41,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:41,350 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:41,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 20:35:41,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:41,411 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 20:35:41,413 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:41,463 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 20:35:41,463 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:41,613 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 20:35:41,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660984363] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:41,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1497121780] [2023-11-23 20:35:41,616 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-23 20:35:41,617 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:41,617 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:41,618 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:41,619 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 11 [2023-11-23 20:35:41,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317074128] [2023-11-23 20:35:41,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:41,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:35:41,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:41,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:35:41,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:35:41,621 INFO L87 Difference]: Start difference. First operand 2955 states and 4117 transitions. Second operand has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 20:35:42,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:42,233 INFO L93 Difference]: Finished difference Result 4981 states and 7663 transitions. [2023-11-23 20:35:42,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:35:42,233 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2023-11-23 20:35:42,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:42,262 INFO L225 Difference]: With dead ends: 4981 [2023-11-23 20:35:42,262 INFO L226 Difference]: Without dead ends: 2966 [2023-11-23 20:35:42,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2023-11-23 20:35:42,295 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 94 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:42,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 114 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:42,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2966 states. [2023-11-23 20:35:42,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2966 to 2950. [2023-11-23 20:35:42,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2950 states, 2055 states have (on average 1.1012165450121654) internal successors, (2263), 2104 states have internal predecessors, (2263), 544 states have call successors, (544), 105 states have call predecessors, (544), 346 states have return successors, (1299), 740 states have call predecessors, (1299), 508 states have call successors, (1299) [2023-11-23 20:35:42,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2950 states to 2950 states and 4106 transitions. [2023-11-23 20:35:42,842 INFO L78 Accepts]: Start accepts. Automaton has 2950 states and 4106 transitions. Word has length 50 [2023-11-23 20:35:42,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:42,842 INFO L495 AbstractCegarLoop]: Abstraction has 2950 states and 4106 transitions. [2023-11-23 20:35:42,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 20:35:42,843 INFO L276 IsEmpty]: Start isEmpty. Operand 2950 states and 4106 transitions. [2023-11-23 20:35:42,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-23 20:35:42,848 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:42,848 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:42,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:43,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-23 20:35:43,073 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:43,073 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:43,073 INFO L85 PathProgramCache]: Analyzing trace with hash 553185385, now seen corresponding path program 1 times [2023-11-23 20:35:43,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:43,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622047256] [2023-11-23 20:35:43,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:43,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:43,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:43,358 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 20:35:43,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:43,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622047256] [2023-11-23 20:35:43,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622047256] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:43,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415009632] [2023-11-23 20:35:43,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:43,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:43,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:43,361 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:43,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-23 20:35:43,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:43,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-23 20:35:43,438 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:43,492 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-23 20:35:43,492 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 20:35:44,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415009632] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:44,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1278297743] [2023-11-23 20:35:44,157 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:35:44,157 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:44,158 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:44,159 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:44,160 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2023-11-23 20:35:44,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412081426] [2023-11-23 20:35:44,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:44,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-23 20:35:44,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:44,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-23 20:35:44,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2023-11-23 20:35:44,163 INFO L87 Difference]: Start difference. First operand 2950 states and 4106 transitions. Second operand has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:35:47,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:47,397 INFO L93 Difference]: Finished difference Result 10121 states and 20996 transitions. [2023-11-23 20:35:47,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-11-23 20:35:47,398 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2023-11-23 20:35:47,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:47,583 INFO L225 Difference]: With dead ends: 10121 [2023-11-23 20:35:47,583 INFO L226 Difference]: Without dead ends: 9693 [2023-11-23 20:35:47,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2336 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2023-11-23 20:35:47,621 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 215 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:47,621 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 237 Invalid, 756 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 20:35:47,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9693 states. [2023-11-23 20:35:49,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9693 to 6481. [2023-11-23 20:35:49,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6481 states, 4213 states have (on average 1.061713743175884) internal successors, (4473), 4253 states have internal predecessors, (4473), 1297 states have call successors, (1297), 133 states have call predecessors, (1297), 966 states have return successors, (8798), 2094 states have call predecessors, (8798), 1249 states have call successors, (8798) [2023-11-23 20:35:49,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6481 states to 6481 states and 14568 transitions. [2023-11-23 20:35:49,148 INFO L78 Accepts]: Start accepts. Automaton has 6481 states and 14568 transitions. Word has length 52 [2023-11-23 20:35:49,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:49,149 INFO L495 AbstractCegarLoop]: Abstraction has 6481 states and 14568 transitions. [2023-11-23 20:35:49,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:35:49,149 INFO L276 IsEmpty]: Start isEmpty. Operand 6481 states and 14568 transitions. [2023-11-23 20:35:49,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-23 20:35:49,153 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:49,153 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-11-23 20:35:49,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:49,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-23 20:35:49,381 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:49,382 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:49,382 INFO L85 PathProgramCache]: Analyzing trace with hash -352778574, now seen corresponding path program 1 times [2023-11-23 20:35:49,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:49,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510570425] [2023-11-23 20:35:49,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:49,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:49,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:49,625 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 20:35:49,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:49,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510570425] [2023-11-23 20:35:49,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510570425] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:49,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002512858] [2023-11-23 20:35:49,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:49,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:49,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:49,629 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:49,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-23 20:35:49,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:49,692 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 20:35:49,694 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:49,782 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 20:35:49,783 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:50,036 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 20:35:50,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002512858] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:50,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597406285] [2023-11-23 20:35:50,089 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 20:35:50,089 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:50,089 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:50,090 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:50,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-11-23 20:35:50,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956923711] [2023-11-23 20:35:50,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:50,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-23 20:35:50,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:50,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-23 20:35:50,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-11-23 20:35:50,092 INFO L87 Difference]: Start difference. First operand 6481 states and 14568 transitions. Second operand has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:52,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:52,604 INFO L93 Difference]: Finished difference Result 18687 states and 42108 transitions. [2023-11-23 20:35:52,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-11-23 20:35:52,605 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-11-23 20:35:52,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:52,818 INFO L225 Difference]: With dead ends: 18687 [2023-11-23 20:35:52,819 INFO L226 Difference]: Without dead ends: 18685 [2023-11-23 20:35:52,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-11-23 20:35:52,865 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 645 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 253 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 253 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:52,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [650 Valid, 313 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [253 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:35:52,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18685 states. [2023-11-23 20:35:55,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18685 to 18601. [2023-11-23 20:35:55,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18601 states, 12061 states have (on average 1.058369952740237) internal successors, (12765), 12221 states have internal predecessors, (12765), 3733 states have call successors, (3733), 373 states have call predecessors, (3733), 2802 states have return successors, (25412), 6006 states have call predecessors, (25412), 3589 states have call successors, (25412) [2023-11-23 20:35:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18601 states to 18601 states and 41910 transitions. [2023-11-23 20:35:56,176 INFO L78 Accepts]: Start accepts. Automaton has 18601 states and 41910 transitions. Word has length 56 [2023-11-23 20:35:56,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:56,177 INFO L495 AbstractCegarLoop]: Abstraction has 18601 states and 41910 transitions. [2023-11-23 20:35:56,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:56,178 INFO L276 IsEmpty]: Start isEmpty. Operand 18601 states and 41910 transitions. [2023-11-23 20:35:56,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-23 20:35:56,182 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:56,182 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:56,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:56,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-23 20:35:56,392 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:35:56,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:56,393 INFO L85 PathProgramCache]: Analyzing trace with hash -2005451109, now seen corresponding path program 1 times [2023-11-23 20:35:56,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:56,393 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268866711] [2023-11-23 20:35:56,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:56,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:56,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:56,867 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 51 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-23 20:35:56,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:56,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268866711] [2023-11-23 20:35:56,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268866711] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:56,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835757419] [2023-11-23 20:35:56,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:56,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:56,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:56,870 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:56,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-23 20:35:56,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:56,946 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:35:56,949 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:57,008 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 43 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-11-23 20:35:57,008 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:58,044 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 60 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-23 20:35:58,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835757419] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:58,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023020919] [2023-11-23 20:35:58,047 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:35:58,047 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:58,048 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:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2023-11-23 20:35:58,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:58,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2023-11-23 20:35:58,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654937796] [2023-11-23 20:35:58,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:58,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 20:35:58,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:58,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 20:35:58,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2023-11-23 20:35:58,052 INFO L87 Difference]: Start difference. First operand 18601 states and 41910 transitions. Second operand has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:36:02,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:02,301 INFO L93 Difference]: Finished difference Result 39022 states and 106176 transitions. [2023-11-23 20:36:02,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-11-23 20:36:02,302 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 71 [2023-11-23 20:36:02,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:02,499 INFO L225 Difference]: With dead ends: 39022 [2023-11-23 20:36:02,500 INFO L226 Difference]: Without dead ends: 22129 [2023-11-23 20:36:02,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 874 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=880, Invalid=3542, Unknown=0, NotChecked=0, Total=4422 [2023-11-23 20:36:02,978 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 147 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:02,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 315 Invalid, 895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 20:36:03,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22129 states. [2023-11-23 20:36:05,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22129 to 20885. [2023-11-23 20:36:05,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20885 states, 13524 states have (on average 1.054421768707483) internal successors, (14260), 13721 states have internal predecessors, (14260), 4233 states have call successors, (4233), 427 states have call predecessors, (4233), 3123 states have return successors, (21793), 6736 states have call predecessors, (21793), 4065 states have call successors, (21793) [2023-11-23 20:36:06,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20885 states to 20885 states and 40286 transitions. [2023-11-23 20:36:06,112 INFO L78 Accepts]: Start accepts. Automaton has 20885 states and 40286 transitions. Word has length 71 [2023-11-23 20:36:06,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:06,113 INFO L495 AbstractCegarLoop]: Abstraction has 20885 states and 40286 transitions. [2023-11-23 20:36:06,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:36:06,113 INFO L276 IsEmpty]: Start isEmpty. Operand 20885 states and 40286 transitions. [2023-11-23 20:36:06,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-11-23 20:36:06,119 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:06,119 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2023-11-23 20:36:06,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:06,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:06,333 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-23 20:36:06,333 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:06,333 INFO L85 PathProgramCache]: Analyzing trace with hash -1078600670, now seen corresponding path program 2 times [2023-11-23 20:36:06,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:06,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847945241] [2023-11-23 20:36:06,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:06,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:06,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:06,855 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:06,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:06,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847945241] [2023-11-23 20:36:06,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847945241] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:06,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381288462] [2023-11-23 20:36:06,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:36:06,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:06,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:06,857 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:06,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1565124-e876-497a-9b79-a12337ad1f2e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-23 20:36:06,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-23 20:36:06,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:36:06,931 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-23 20:36:06,932 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:07,009 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:07,009 INFO L327 TraceCheckSpWp]: Computing backward predicates...