./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 0e0057cc 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_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh --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 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:11:28,435 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:11:28,501 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-12-02 14:11:28,506 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:11:28,507 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:11:28,531 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:11:28,532 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:11:28,532 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:11:28,533 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:11:28,534 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:11:28,534 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:11:28,535 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:11:28,535 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:11:28,536 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:11:28,536 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:11:28,537 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:11:28,537 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:11:28,538 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:11:28,538 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:11:28,539 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:11:28,539 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:11:28,540 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:11:28,540 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:11:28,541 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:11:28,541 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:11:28,542 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:11:28,542 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:11:28,543 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:11:28,543 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:11:28,543 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:11:28,544 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:11:28,544 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-12-02 14:11:28,545 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 14:11:28,545 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:11:28,545 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:11:28,546 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:11:28,546 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:11:28,546 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:11:28,546 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:11:28,547 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:11:28,547 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:11:28,547 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:11:28,547 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:11:28,548 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:11:28,549 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_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 [2023-12-02 14:11:28,769 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:11:28,793 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:11:28,795 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:11:28,797 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:11:28,797 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:11:28,799 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/recursive/Ackermann04.c [2023-12-02 14:11:31,590 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:11:31,764 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:11:31,765 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/sv-benchmarks/c/recursive/Ackermann04.c [2023-12-02 14:11:31,773 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/data/e7c46067b/e054ccec923f4d228ba1fdf71a973386/FLAGff64ccb09 [2023-12-02 14:11:31,789 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/data/e7c46067b/e054ccec923f4d228ba1fdf71a973386 [2023-12-02 14:11:31,792 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:11:31,794 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:11:31,795 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:11:31,796 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:11:31,802 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:11:31,802 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:11:31" (1/1) ... [2023-12-02 14:11:31,804 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5956457a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:31, skipping insertion in model container [2023-12-02 14:11:31,804 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:11:31" (1/1) ... [2023-12-02 14:11:31,827 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:11:32,001 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:11:32,013 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:11:32,031 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:11:32,047 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:11:32,048 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32 WrapperNode [2023-12-02 14:11:32,048 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:11:32,049 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:11:32,049 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:11:32,049 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:11:32,058 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,066 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,087 INFO L138 Inliner]: procedures = 13, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2023-12-02 14:11:32,087 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:11:32,088 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:11:32,088 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:11:32,088 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:11:32,099 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,099 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,101 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,101 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,104 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,107 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,108 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,109 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,111 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:11:32,112 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:11:32,112 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:11:32,112 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:11:32,113 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (1/1) ... [2023-12-02 14:11:32,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:11:32,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:32,145 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:11:32,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:11:32,176 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:11:32,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:11:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:11:32,177 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2023-12-02 14:11:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2023-12-02 14:11:32,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:11:32,244 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:11:32,246 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:11:32,404 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:11:32,438 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:11:32,438 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-12-02 14:11:32,440 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:11:32 BoogieIcfgContainer [2023-12-02 14:11:32,440 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:11:32,443 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:11:32,443 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:11:32,447 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:11:32,447 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:11:31" (1/3) ... [2023-12-02 14:11:32,448 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28a5b519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:11:32, skipping insertion in model container [2023-12-02 14:11:32,448 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:32" (2/3) ... [2023-12-02 14:11:32,449 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28a5b519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:11:32, skipping insertion in model container [2023-12-02 14:11:32,449 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:11:32" (3/3) ... [2023-12-02 14:11:32,450 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann04.c [2023-12-02 14:11:32,466 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:11:32,467 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-12-02 14:11:32,513 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:11:32,520 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;@3e6ec506, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:11:32,520 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-12-02 14:11:32,524 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) [2023-12-02 14:11:32,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 14:11:32,531 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:32,531 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:32,532 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:32,537 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:32,537 INFO L85 PathProgramCache]: Analyzing trace with hash -2118177911, now seen corresponding path program 1 times [2023-12-02 14:11:32,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:32,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048831083] [2023-12-02 14:11:32,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:32,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:32,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:32,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:32,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:32,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048831083] [2023-12-02 14:11:32,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048831083] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:32,784 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:32,784 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:11:32,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908071933] [2023-12-02 14:11:32,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:32,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:32,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:32,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:32,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:32,849 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) [2023-12-02 14:11:32,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:32,996 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2023-12-02 14:11:32,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:11:32,999 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 [2023-12-02 14:11:32,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:33,007 INFO L225 Difference]: With dead ends: 64 [2023-12-02 14:11:33,007 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 14:11:33,010 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 [2023-12-02 14:11:33,014 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 [2023-12-02 14:11:33,016 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] [2023-12-02 14:11:33,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 14:11:33,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2023-12-02 14:11:33,055 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) [2023-12-02 14:11:33,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2023-12-02 14:11:33,060 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2023-12-02 14:11:33,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:33,061 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2023-12-02 14:11:33,061 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) [2023-12-02 14:11:33,061 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2023-12-02 14:11:33,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:11:33,062 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:33,062 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:33,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:11:33,063 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:33,064 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:33,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1239000740, now seen corresponding path program 1 times [2023-12-02 14:11:33,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:33,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250080957] [2023-12-02 14:11:33,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:33,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:33,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:33,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250080957] [2023-12-02 14:11:33,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250080957] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:33,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:33,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:11:33,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955078690] [2023-12-02 14:11:33,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:33,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:33,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:33,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:33,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:33,153 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) [2023-12-02 14:11:33,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:33,250 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2023-12-02 14:11:33,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:11:33,251 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 [2023-12-02 14:11:33,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:33,254 INFO L225 Difference]: With dead ends: 100 [2023-12-02 14:11:33,254 INFO L226 Difference]: Without dead ends: 94 [2023-12-02 14:11:33,255 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 [2023-12-02 14:11:33,257 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-12-02 14:11:33,258 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] [2023-12-02 14:11:33,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-12-02 14:11:33,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2023-12-02 14:11:33,279 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) [2023-12-02 14:11:33,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 114 transitions. [2023-12-02 14:11:33,284 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 114 transitions. Word has length 8 [2023-12-02 14:11:33,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:33,285 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 114 transitions. [2023-12-02 14:11:33,285 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) [2023-12-02 14:11:33,285 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 114 transitions. [2023-12-02 14:11:33,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:11:33,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:33,286 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:33,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:11:33,287 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:33,288 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:33,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1239005737, now seen corresponding path program 1 times [2023-12-02 14:11:33,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:33,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249575737] [2023-12-02 14:11:33,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:33,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:33,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:33,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249575737] [2023-12-02 14:11:33,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249575737] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:33,360 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:33,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:11:33,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909501973] [2023-12-02 14:11:33,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:33,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:33,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:33,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:33,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:33,363 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) [2023-12-02 14:11:33,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:33,453 INFO L93 Difference]: Finished difference Result 113 states and 151 transitions. [2023-12-02 14:11:33,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:11:33,454 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 [2023-12-02 14:11:33,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:33,456 INFO L225 Difference]: With dead ends: 113 [2023-12-02 14:11:33,457 INFO L226 Difference]: Without dead ends: 109 [2023-12-02 14:11:33,457 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 [2023-12-02 14:11:33,459 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 49 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 [2023-12-02 14:11:33,460 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] [2023-12-02 14:11:33,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-12-02 14:11:33,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 101. [2023-12-02 14:11:33,478 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) [2023-12-02 14:11:33,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 135 transitions. [2023-12-02 14:11:33,481 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 135 transitions. Word has length 8 [2023-12-02 14:11:33,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:33,481 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 135 transitions. [2023-12-02 14:11:33,481 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) [2023-12-02 14:11:33,482 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 135 transitions. [2023-12-02 14:11:33,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 14:11:33,482 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:33,482 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:33,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 14:11:33,483 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:33,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:33,484 INFO L85 PathProgramCache]: Analyzing trace with hash 245682796, now seen corresponding path program 1 times [2023-12-02 14:11:33,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:33,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354248360] [2023-12-02 14:11:33,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:33,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:33,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:33,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354248360] [2023-12-02 14:11:33,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354248360] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:33,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:33,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:11:33,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100104839] [2023-12-02 14:11:33,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:33,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:33,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:33,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:33,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:33,545 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) [2023-12-02 14:11:33,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:33,604 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2023-12-02 14:11:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:11:33,605 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 [2023-12-02 14:11:33,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:33,607 INFO L225 Difference]: With dead ends: 101 [2023-12-02 14:11:33,607 INFO L226 Difference]: Without dead ends: 99 [2023-12-02 14:11:33,607 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 [2023-12-02 14:11:33,609 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, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:33,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:33,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-12-02 14:11:33,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-12-02 14:11:33,627 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) [2023-12-02 14:11:33,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2023-12-02 14:11:33,629 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2023-12-02 14:11:33,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:33,629 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2023-12-02 14:11:33,629 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) [2023-12-02 14:11:33,630 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2023-12-02 14:11:33,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:11:33,630 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:33,630 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:33,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 14:11:33,631 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:33,631 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:33,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410727, now seen corresponding path program 1 times [2023-12-02 14:11:33,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:33,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79627290] [2023-12-02 14:11:33,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:33,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,685 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:33,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:33,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79627290] [2023-12-02 14:11:33,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79627290] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:33,686 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:33,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:11:33,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036823236] [2023-12-02 14:11:33,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:33,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:11:33,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:33,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:11:33,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:11:33,688 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) [2023-12-02 14:11:33,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:33,746 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2023-12-02 14:11:33,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:11:33,747 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 [2023-12-02 14:11:33,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:33,749 INFO L225 Difference]: With dead ends: 167 [2023-12-02 14:11:33,749 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 14:11:33,752 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 [2023-12-02 14:11:33,753 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, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:33,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 82 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:33,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 14:11:33,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2023-12-02 14:11:33,769 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) [2023-12-02 14:11:33,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2023-12-02 14:11:33,771 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 14 [2023-12-02 14:11:33,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:33,772 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2023-12-02 14:11:33,772 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) [2023-12-02 14:11:33,772 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2023-12-02 14:11:33,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:11:33,773 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:33,773 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:33,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 14:11:33,774 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:33,774 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:33,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410503, now seen corresponding path program 1 times [2023-12-02 14:11:33,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:33,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965114211] [2023-12-02 14:11:33,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:33,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,855 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:33,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:33,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965114211] [2023-12-02 14:11:33,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965114211] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:33,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664448603] [2023-12-02 14:11:33,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:33,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:33,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:33,860 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:33,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:11:33,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:33,932 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:11:33,937 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:33,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:34,000 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:34,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:34,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [664448603] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:34,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74952861] [2023-12-02 14:11:34,103 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 14:11:34,103 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:34,108 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) [2023-12-02 14:11:34,109 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:34,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-12-02 14:11:34,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525173519] [2023-12-02 14:11:34,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:34,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:11:34,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:34,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:11:34,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:11:34,112 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) [2023-12-02 14:11:34,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:34,433 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2023-12-02 14:11:34,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:11:34,434 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 [2023-12-02 14:11:34,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:34,438 INFO L225 Difference]: With dead ends: 273 [2023-12-02 14:11:34,438 INFO L226 Difference]: Without dead ends: 271 [2023-12-02 14:11:34,439 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:11:34,440 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 [2023-12-02 14:11:34,441 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] [2023-12-02 14:11:34,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2023-12-02 14:11:34,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2023-12-02 14:11:34,477 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) [2023-12-02 14:11:34,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2023-12-02 14:11:34,480 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 14 [2023-12-02 14:11:34,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:34,481 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2023-12-02 14:11:34,481 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) [2023-12-02 14:11:34,481 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2023-12-02 14:11:34,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 14:11:34,482 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:34,482 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:34,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:34,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:34,683 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:34,683 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:34,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1750564749, now seen corresponding path program 1 times [2023-12-02 14:11:34,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:34,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161673971] [2023-12-02 14:11:34,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:34,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:34,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:34,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161673971] [2023-12-02 14:11:34,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161673971] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:34,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470371121] [2023-12-02 14:11:34,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:34,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:34,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:34,761 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:34,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:11:34,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:34,806 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:11:34,808 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:34,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:34,849 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:11:34,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470371121] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:34,849 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:11:34,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2023-12-02 14:11:34,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570357648] [2023-12-02 14:11:34,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:34,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:34,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:34,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:34,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:11:34,851 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 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) [2023-12-02 14:11:34,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:34,963 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2023-12-02 14:11:34,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:11:34,964 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 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 15 [2023-12-02 14:11:34,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:34,968 INFO L225 Difference]: With dead ends: 327 [2023-12-02 14:11:34,968 INFO L226 Difference]: Without dead ends: 326 [2023-12-02 14:11:34,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:11:34,969 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 51 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:34,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 79 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:34,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2023-12-02 14:11:34,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2023-12-02 14:11:35,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 226 states have (on average 1.261061946902655) internal successors, (285), 233 states have internal predecessors, (285), 45 states have call successors, (45), 16 states have call predecessors, (45), 15 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-12-02 14:11:35,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2023-12-02 14:11:35,003 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 15 [2023-12-02 14:11:35,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:35,003 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2023-12-02 14:11:35,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 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) [2023-12-02 14:11:35,004 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2023-12-02 14:11:35,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 14:11:35,004 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:35,005 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:35,010 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:11:35,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:35,205 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:35,206 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:35,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1576448012, now seen corresponding path program 1 times [2023-12-02 14:11:35,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:35,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130717053] [2023-12-02 14:11:35,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:35,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:35,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:35,271 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:35,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:35,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130717053] [2023-12-02 14:11:35,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130717053] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:35,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401409607] [2023-12-02 14:11:35,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:35,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:35,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:35,274 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:35,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:11:35,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:35,315 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:11:35,317 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:35,350 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:35,350 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:35,424 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:35,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401409607] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:35,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954837669] [2023-12-02 14:11:35,428 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:11:35,428 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:35,429 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) [2023-12-02 14:11:35,429 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:35,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-12-02 14:11:35,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140975112] [2023-12-02 14:11:35,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:35,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:11:35,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:35,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:11:35,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:11:35,431 INFO L87 Difference]: Start difference. First operand 292 states and 372 transitions. Second operand has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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) [2023-12-02 14:11:35,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:35,717 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2023-12-02 14:11:35,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:11:35,721 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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 18 [2023-12-02 14:11:35,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:35,726 INFO L225 Difference]: With dead ends: 590 [2023-12-02 14:11:35,726 INFO L226 Difference]: Without dead ends: 589 [2023-12-02 14:11:35,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:11:35,728 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 156 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:35,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 166 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:11:35,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2023-12-02 14:11:35,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2023-12-02 14:11:35,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 406 states have (on average 1.2044334975369457) internal successors, (489), 413 states have internal predecessors, (489), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-12-02 14:11:35,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2023-12-02 14:11:35,778 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 18 [2023-12-02 14:11:35,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:35,779 INFO L495 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2023-12-02 14:11:35,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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) [2023-12-02 14:11:35,779 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2023-12-02 14:11:35,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 14:11:35,780 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:35,780 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] [2023-12-02 14:11:35,786 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:11:35,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:35,984 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:35,984 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:35,984 INFO L85 PathProgramCache]: Analyzing trace with hash 244799614, now seen corresponding path program 1 times [2023-12-02 14:11:35,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:35,985 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055888951] [2023-12-02 14:11:35,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:35,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:35,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:36,087 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:11:36,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:36,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055888951] [2023-12-02 14:11:36,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055888951] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:36,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519280231] [2023-12-02 14:11:36,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:36,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:36,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:36,089 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:36,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:11:36,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:36,139 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:11:36,141 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:36,185 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:11:36,185 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:11:36,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519280231] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:36,185 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:11:36,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 10 [2023-12-02 14:11:36,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796431112] [2023-12-02 14:11:36,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:36,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:36,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:36,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:36,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:11:36,188 INFO L87 Difference]: Start difference. First operand 520 states and 648 transitions. Second operand has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 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) [2023-12-02 14:11:36,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:36,328 INFO L93 Difference]: Finished difference Result 561 states and 695 transitions. [2023-12-02 14:11:36,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:11:36,329 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 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 [2023-12-02 14:11:36,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:36,333 INFO L225 Difference]: With dead ends: 561 [2023-12-02 14:11:36,333 INFO L226 Difference]: Without dead ends: 560 [2023-12-02 14:11:36,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:11:36,335 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 43 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:36,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 97 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:36,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2023-12-02 14:11:36,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 519. [2023-12-02 14:11:36,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 406 states have (on average 1.1945812807881773) internal successors, (485), 412 states have internal predecessors, (485), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-12-02 14:11:36,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 644 transitions. [2023-12-02 14:11:36,401 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 644 transitions. Word has length 23 [2023-12-02 14:11:36,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:36,402 INFO L495 AbstractCegarLoop]: Abstraction has 519 states and 644 transitions. [2023-12-02 14:11:36,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 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) [2023-12-02 14:11:36,402 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 644 transitions. [2023-12-02 14:11:36,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 14:11:36,403 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:36,403 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] [2023-12-02 14:11:36,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:11:36,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:36,608 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:36,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:36,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1001146494, now seen corresponding path program 1 times [2023-12-02 14:11:36,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:36,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890321888] [2023-12-02 14:11:36,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:36,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:36,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:36,694 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:11:36,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:36,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890321888] [2023-12-02 14:11:36,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890321888] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:36,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844514432] [2023-12-02 14:11:36,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:36,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:36,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:36,697 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:36,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:11:36,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:36,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:11:36,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:36,775 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:11:36,775 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:36,927 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:11:36,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844514432] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:36,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074938587] [2023-12-02 14:11:36,930 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:11:36,930 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:36,930 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) [2023-12-02 14:11:36,931 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:36,931 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-12-02 14:11:36,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944570413] [2023-12-02 14:11:36,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:36,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 14:11:36,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:36,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 14:11:36,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:11:36,932 INFO L87 Difference]: Start difference. First operand 519 states and 644 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) [2023-12-02 14:11:37,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:37,182 INFO L93 Difference]: Finished difference Result 822 states and 1146 transitions. [2023-12-02 14:11:37,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:11:37,183 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 [2023-12-02 14:11:37,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:37,190 INFO L225 Difference]: With dead ends: 822 [2023-12-02 14:11:37,190 INFO L226 Difference]: Without dead ends: 820 [2023-12-02 14:11:37,191 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 [2023-12-02 14:11:37,192 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 140 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:37,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 101 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:37,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2023-12-02 14:11:37,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 746. [2023-12-02 14:11:37,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 558 states have (on average 1.1827956989247312) internal successors, (660), 583 states have internal predecessors, (660), 130 states have call successors, (130), 35 states have call predecessors, (130), 53 states have return successors, (154), 127 states have call predecessors, (154), 126 states have call successors, (154) [2023-12-02 14:11:37,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2023-12-02 14:11:37,293 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2023-12-02 14:11:37,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:37,293 INFO L495 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2023-12-02 14:11:37,294 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) [2023-12-02 14:11:37,294 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2023-12-02 14:11:37,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 14:11:37,295 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:37,296 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] [2023-12-02 14:11:37,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:11:37,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:11:37,497 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:37,497 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:37,498 INFO L85 PathProgramCache]: Analyzing trace with hash -24086519, now seen corresponding path program 1 times [2023-12-02 14:11:37,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:37,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738524711] [2023-12-02 14:11:37,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:37,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:37,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:37,597 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:11:37,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:37,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738524711] [2023-12-02 14:11:37,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738524711] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:37,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081999541] [2023-12-02 14:11:37,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:37,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:37,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:37,599 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:37,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:11:37,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:37,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:11:37,657 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:37,721 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:11:37,721 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:37,843 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:11:37,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081999541] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:37,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:11:37,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2023-12-02 14:11:37,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954597489] [2023-12-02 14:11:37,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:37,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:11:37,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:37,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:11:37,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:11:37,846 INFO L87 Difference]: Start difference. First operand 746 states and 944 transitions. Second operand has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 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) [2023-12-02 14:11:38,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:38,052 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2023-12-02 14:11:38,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:11:38,053 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 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 26 [2023-12-02 14:11:38,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:38,058 INFO L225 Difference]: With dead ends: 901 [2023-12-02 14:11:38,059 INFO L226 Difference]: Without dead ends: 900 [2023-12-02 14:11:38,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:11:38,060 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 51 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:38,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 99 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:38,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2023-12-02 14:11:38,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2023-12-02 14:11:38,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 616 states have (on average 1.1818181818181819) internal successors, (728), 644 states have internal predecessors, (728), 149 states have call successors, (149), 38 states have call predecessors, (149), 59 states have return successors, (183), 146 states have call predecessors, (183), 145 states have call successors, (183) [2023-12-02 14:11:38,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2023-12-02 14:11:38,140 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 26 [2023-12-02 14:11:38,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:38,140 INFO L495 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2023-12-02 14:11:38,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 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) [2023-12-02 14:11:38,141 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2023-12-02 14:11:38,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 14:11:38,142 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:38,142 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] [2023-12-02 14:11:38,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:11:38,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:11:38,343 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:38,343 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:38,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1210732047, now seen corresponding path program 1 times [2023-12-02 14:11:38,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:38,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438598512] [2023-12-02 14:11:38,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:38,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:38,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:38,462 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:38,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:38,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438598512] [2023-12-02 14:11:38,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438598512] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:38,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290328308] [2023-12-02 14:11:38,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:38,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:38,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:38,464 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:38,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:11:38,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:38,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:11:38,523 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:38,573 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:38,573 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:38,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290328308] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:38,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719610525] [2023-12-02 14:11:38,801 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:11:38,801 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:38,801 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) [2023-12-02 14:11:38,801 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:38,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-12-02 14:11:38,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302814399] [2023-12-02 14:11:38,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:38,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:11:38,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:38,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:11:38,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:11:38,804 INFO L87 Difference]: Start difference. First operand 829 states and 1060 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) [2023-12-02 14:11:39,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:39,394 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2023-12-02 14:11:39,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 14:11:39,395 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 [2023-12-02 14:11:39,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:39,408 INFO L225 Difference]: With dead ends: 1544 [2023-12-02 14:11:39,408 INFO L226 Difference]: Without dead ends: 1542 [2023-12-02 14:11:39,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2023-12-02 14:11:39,410 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 129 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:39,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 162 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:11:39,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2023-12-02 14:11:39,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2023-12-02 14:11:39,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1294 states, 927 states have (on average 1.1661272923408845) internal successors, (1081), 974 states have internal predecessors, (1081), 247 states have call successors, (247), 53 states have call predecessors, (247), 115 states have return successors, (548), 266 states have call predecessors, (548), 242 states have call successors, (548) [2023-12-02 14:11:39,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2023-12-02 14:11:39,593 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 33 [2023-12-02 14:11:39,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:39,593 INFO L495 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2023-12-02 14:11:39,593 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) [2023-12-02 14:11:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2023-12-02 14:11:39,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 14:11:39,595 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:39,595 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:39,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 14:11:39,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:39,800 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:39,800 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:39,801 INFO L85 PathProgramCache]: Analyzing trace with hash 60876767, now seen corresponding path program 2 times [2023-12-02 14:11:39,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:39,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782891280] [2023-12-02 14:11:39,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:39,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:39,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:39,919 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:11:39,919 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:39,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782891280] [2023-12-02 14:11:39,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782891280] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:39,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145362806] [2023-12-02 14:11:39,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:39,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:39,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:39,921 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:39,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:11:39,978 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:11:39,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:39,979 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:11:39,981 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:40,034 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:11:40,034 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:11:40,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145362806] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:40,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851520874] [2023-12-02 14:11:40,219 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:11:40,219 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:40,219 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) [2023-12-02 14:11:40,219 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:40,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-12-02 14:11:40,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509714109] [2023-12-02 14:11:40,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:40,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:11:40,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:40,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:11:40,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:11:40,222 INFO L87 Difference]: Start difference. First operand 1294 states and 1876 transitions. Second operand has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:11:40,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:40,941 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2023-12-02 14:11:40,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 14:11:40,942 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2023-12-02 14:11:40,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:40,960 INFO L225 Difference]: With dead ends: 2153 [2023-12-02 14:11:40,961 INFO L226 Difference]: Without dead ends: 2119 [2023-12-02 14:11:40,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:11:40,964 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 432 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:40,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 148 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:11:40,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2023-12-02 14:11:41,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1967. [2023-12-02 14:11:41,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1967 states, 1408 states have (on average 1.1519886363636365) internal successors, (1622), 1484 states have internal predecessors, (1622), 376 states have call successors, (376), 82 states have call predecessors, (376), 178 states have return successors, (845), 400 states have call predecessors, (845), 361 states have call successors, (845) [2023-12-02 14:11:41,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1967 states to 1967 states and 2843 transitions. [2023-12-02 14:11:41,232 INFO L78 Accepts]: Start accepts. Automaton has 1967 states and 2843 transitions. Word has length 34 [2023-12-02 14:11:41,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:41,233 INFO L495 AbstractCegarLoop]: Abstraction has 1967 states and 2843 transitions. [2023-12-02 14:11:41,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:11:41,234 INFO L276 IsEmpty]: Start isEmpty. Operand 1967 states and 2843 transitions. [2023-12-02 14:11:41,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 14:11:41,235 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:41,235 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] [2023-12-02 14:11:41,241 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:11:41,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:41,436 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:41,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:41,437 INFO L85 PathProgramCache]: Analyzing trace with hash 427659960, now seen corresponding path program 1 times [2023-12-02 14:11:41,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:41,437 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812313553] [2023-12-02 14:11:41,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:41,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:41,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:41,528 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:41,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:41,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812313553] [2023-12-02 14:11:41,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812313553] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:41,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381369293] [2023-12-02 14:11:41,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:41,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:41,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:41,530 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:41,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:11:41,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:41,583 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:11:41,585 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:41,632 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:41,632 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:41,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381369293] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:41,806 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:11:41,806 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2023-12-02 14:11:41,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064818065] [2023-12-02 14:11:41,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:41,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:11:41,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:41,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:11:41,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:11:41,808 INFO L87 Difference]: Start difference. First operand 1967 states and 2843 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) [2023-12-02 14:11:42,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:42,220 INFO L93 Difference]: Finished difference Result 2199 states and 3486 transitions. [2023-12-02 14:11:42,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 14:11:42,221 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 [2023-12-02 14:11:42,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:42,235 INFO L225 Difference]: With dead ends: 2199 [2023-12-02 14:11:42,235 INFO L226 Difference]: Without dead ends: 2198 [2023-12-02 14:11:42,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2023-12-02 14:11:42,237 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 65 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:42,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 154 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:42,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2198 states. [2023-12-02 14:11:42,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2198 to 1975. [2023-12-02 14:11:42,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1416 states have (on average 1.1490112994350283) internal successors, (1627), 1488 states have internal predecessors, (1627), 380 states have call successors, (380), 82 states have call predecessors, (380), 174 states have return successors, (699), 404 states have call predecessors, (699), 365 states have call successors, (699) [2023-12-02 14:11:42,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2706 transitions. [2023-12-02 14:11:42,449 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2706 transitions. Word has length 35 [2023-12-02 14:11:42,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:42,449 INFO L495 AbstractCegarLoop]: Abstraction has 1975 states and 2706 transitions. [2023-12-02 14:11:42,450 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) [2023-12-02 14:11:42,450 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2706 transitions. [2023-12-02 14:11:42,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 14:11:42,452 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:42,452 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 14:11:42,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:11:42,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:11:42,653 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:42,654 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:42,654 INFO L85 PathProgramCache]: Analyzing trace with hash 886287478, now seen corresponding path program 2 times [2023-12-02 14:11:42,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:42,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118509628] [2023-12-02 14:11:42,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:42,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:42,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:42,803 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:42,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:42,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118509628] [2023-12-02 14:11:42,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118509628] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:42,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139790778] [2023-12-02 14:11:42,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:42,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:42,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:42,805 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:42,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:11:42,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 14:11:42,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:42,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:11:42,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:42,921 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:42,921 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:43,103 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:43,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139790778] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:43,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529088838] [2023-12-02 14:11:43,105 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:11:43,105 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:43,105 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) [2023-12-02 14:11:43,105 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:43,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-12-02 14:11:43,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774238711] [2023-12-02 14:11:43,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:43,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 14:11:43,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:43,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 14:11:43,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-12-02 14:11:43,107 INFO L87 Difference]: Start difference. First operand 1975 states and 2706 transitions. Second operand has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:43,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:43,847 INFO L93 Difference]: Finished difference Result 2825 states and 4250 transitions. [2023-12-02 14:11:43,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 14:11:43,847 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2023-12-02 14:11:43,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:43,882 INFO L225 Difference]: With dead ends: 2825 [2023-12-02 14:11:43,882 INFO L226 Difference]: Without dead ends: 2824 [2023-12-02 14:11:43,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 14:11:43,885 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 481 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 484 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:43,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [484 Valid, 370 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:11:43,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2824 states. [2023-12-02 14:11:44,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2824 to 2647. [2023-12-02 14:11:44,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2647 states, 1896 states have (on average 1.136603375527426) internal successors, (2155), 1992 states have internal predecessors, (2155), 500 states have call successors, (500), 106 states have call predecessors, (500), 246 states have return successors, (909), 548 states have call predecessors, (909), 485 states have call successors, (909) [2023-12-02 14:11:44,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 3564 transitions. [2023-12-02 14:11:44,134 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 3564 transitions. Word has length 42 [2023-12-02 14:11:44,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:44,135 INFO L495 AbstractCegarLoop]: Abstraction has 2647 states and 3564 transitions. [2023-12-02 14:11:44,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:44,136 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 3564 transitions. [2023-12-02 14:11:44,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 14:11:44,139 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:44,139 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] [2023-12-02 14:11:44,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:44,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:44,340 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:44,340 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:44,340 INFO L85 PathProgramCache]: Analyzing trace with hash 798745486, now seen corresponding path program 2 times [2023-12-02 14:11:44,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:44,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703013169] [2023-12-02 14:11:44,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:44,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:44,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:44,498 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:44,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:44,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703013169] [2023-12-02 14:11:44,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703013169] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:44,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291310041] [2023-12-02 14:11:44,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:44,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:44,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:44,500 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:44,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:11:44,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:11:44,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:44,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 14:11:44,559 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:11:44,641 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:44,743 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:44,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291310041] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:44,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [449772591] [2023-12-02 14:11:44,746 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:11:44,746 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:44,747 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) [2023-12-02 14:11:44,747 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:44,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 8] total 18 [2023-12-02 14:11:44,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650763272] [2023-12-02 14:11:44,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:44,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:11:44,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:44,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:11:44,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:11:44,749 INFO L87 Difference]: Start difference. First operand 2647 states and 3564 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) [2023-12-02 14:11:45,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:45,547 INFO L93 Difference]: Finished difference Result 5352 states and 8889 transitions. [2023-12-02 14:11:45,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 14:11:45,548 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 [2023-12-02 14:11:45,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:45,570 INFO L225 Difference]: With dead ends: 5352 [2023-12-02 14:11:45,571 INFO L226 Difference]: Without dead ends: 3352 [2023-12-02 14:11:45,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=273, Invalid=987, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:11:45,593 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 201 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:45,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 104 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:11:45,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3352 states. [2023-12-02 14:11:45,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3352 to 3122. [2023-12-02 14:11:45,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3122 states, 2172 states have (on average 1.0980662983425415) internal successors, (2385), 2208 states have internal predecessors, (2385), 572 states have call successors, (572), 104 states have call predecessors, (572), 373 states have return successors, (1358), 809 states have call predecessors, (1358), 543 states have call successors, (1358) [2023-12-02 14:11:45,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3122 states to 3122 states and 4315 transitions. [2023-12-02 14:11:45,877 INFO L78 Accepts]: Start accepts. Automaton has 3122 states and 4315 transitions. Word has length 43 [2023-12-02 14:11:45,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:45,877 INFO L495 AbstractCegarLoop]: Abstraction has 3122 states and 4315 transitions. [2023-12-02 14:11:45,877 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) [2023-12-02 14:11:45,877 INFO L276 IsEmpty]: Start isEmpty. Operand 3122 states and 4315 transitions. [2023-12-02 14:11:45,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 14:11:45,895 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:45,895 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] [2023-12-02 14:11:45,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:46,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 14:11:46,096 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:46,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:46,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1295270540, now seen corresponding path program 1 times [2023-12-02 14:11:46,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:46,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525361567] [2023-12-02 14:11:46,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:46,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:46,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:46,202 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 14:11:46,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:46,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525361567] [2023-12-02 14:11:46,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525361567] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:46,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037700342] [2023-12-02 14:11:46,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:46,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:46,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:46,204 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:46,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:11:46,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:46,270 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:11:46,272 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:46,303 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 14:11:46,304 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:46,420 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 14:11:46,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037700342] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:46,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177233143] [2023-12-02 14:11:46,423 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-12-02 14:11:46,423 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:46,423 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) [2023-12-02 14:11:46,424 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:46,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 11 [2023-12-02 14:11:46,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338531746] [2023-12-02 14:11:46,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:46,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 14:11:46,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:46,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 14:11:46,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:11:46,426 INFO L87 Difference]: Start difference. First operand 3122 states and 4315 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) [2023-12-02 14:11:46,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:46,910 INFO L93 Difference]: Finished difference Result 5335 states and 8133 transitions. [2023-12-02 14:11:46,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 14:11:46,911 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 [2023-12-02 14:11:46,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:46,939 INFO L225 Difference]: With dead ends: 5335 [2023-12-02 14:11:46,940 INFO L226 Difference]: Without dead ends: 3133 [2023-12-02 14:11:46,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:11:46,970 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 83 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:46,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 127 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:46,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3133 states. [2023-12-02 14:11:47,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3133 to 3117. [2023-12-02 14:11:47,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3117 states, 2168 states have (on average 1.0968634686346863) internal successors, (2378), 2206 states have internal predecessors, (2378), 571 states have call successors, (571), 104 states have call predecessors, (571), 373 states have return successors, (1355), 806 states have call predecessors, (1355), 540 states have call successors, (1355) [2023-12-02 14:11:47,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3117 states to 3117 states and 4304 transitions. [2023-12-02 14:11:47,303 INFO L78 Accepts]: Start accepts. Automaton has 3117 states and 4304 transitions. Word has length 50 [2023-12-02 14:11:47,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:47,303 INFO L495 AbstractCegarLoop]: Abstraction has 3117 states and 4304 transitions. [2023-12-02 14:11:47,303 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) [2023-12-02 14:11:47,303 INFO L276 IsEmpty]: Start isEmpty. Operand 3117 states and 4304 transitions. [2023-12-02 14:11:47,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 14:11:47,306 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:47,306 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:47,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:47,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 14:11:47,517 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:47,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:47,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1345923957, now seen corresponding path program 3 times [2023-12-02 14:11:47,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:47,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300903722] [2023-12-02 14:11:47,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:47,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:47,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:47,702 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:11:47,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:47,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300903722] [2023-12-02 14:11:47,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300903722] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:47,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576267546] [2023-12-02 14:11:47,703 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:11:47,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:47,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:47,704 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:47,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:11:47,759 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:11:47,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:47,760 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 14:11:47,762 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:47,838 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:11:47,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:47,902 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:11:47,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576267546] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:47,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628096045] [2023-12-02 14:11:47,904 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:11:47,904 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:47,905 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) [2023-12-02 14:11:47,905 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:47,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6] total 19 [2023-12-02 14:11:47,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132203254] [2023-12-02 14:11:47,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:47,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 14:11:47,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:47,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 14:11:47,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:11:47,907 INFO L87 Difference]: Start difference. First operand 3117 states and 4304 transitions. Second operand has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:11:48,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:48,636 INFO L93 Difference]: Finished difference Result 4282 states and 6284 transitions. [2023-12-02 14:11:48,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 14:11:48,637 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 50 [2023-12-02 14:11:48,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:48,649 INFO L225 Difference]: With dead ends: 4282 [2023-12-02 14:11:48,650 INFO L226 Difference]: Without dead ends: 1517 [2023-12-02 14:11:48,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=314, Invalid=1092, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 14:11:48,670 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 391 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:48,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 98 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:11:48,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1517 states. [2023-12-02 14:11:48,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1517 to 1398. [2023-12-02 14:11:48,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1398 states, 989 states have (on average 1.0819009100101111) internal successors, (1070), 999 states have internal predecessors, (1070), 256 states have call successors, (256), 60 states have call predecessors, (256), 148 states have return successors, (452), 338 states have call predecessors, (452), 252 states have call successors, (452) [2023-12-02 14:11:48,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1398 states to 1398 states and 1778 transitions. [2023-12-02 14:11:48,811 INFO L78 Accepts]: Start accepts. Automaton has 1398 states and 1778 transitions. Word has length 50 [2023-12-02 14:11:48,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:48,811 INFO L495 AbstractCegarLoop]: Abstraction has 1398 states and 1778 transitions. [2023-12-02 14:11:48,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:11:48,811 INFO L276 IsEmpty]: Start isEmpty. Operand 1398 states and 1778 transitions. [2023-12-02 14:11:48,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 14:11:48,812 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:48,812 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] [2023-12-02 14:11:48,817 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:11:49,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:11:49,013 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:49,013 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:49,013 INFO L85 PathProgramCache]: Analyzing trace with hash 553185385, now seen corresponding path program 1 times [2023-12-02 14:11:49,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:49,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721376005] [2023-12-02 14:11:49,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:49,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:49,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:49,186 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:11:49,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:49,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721376005] [2023-12-02 14:11:49,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721376005] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:49,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400479683] [2023-12-02 14:11:49,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:49,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:49,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:49,187 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:49,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:11:49,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:49,234 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 14:11:49,236 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:49,276 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:11:49,277 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:49,720 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:11:49,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400479683] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:49,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [90589519] [2023-12-02 14:11:49,723 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:11:49,723 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:49,724 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java: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) [2023-12-02 14:11:49,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:49,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2023-12-02 14:11:49,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297487894] [2023-12-02 14:11:49,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:49,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 14:11:49,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:49,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 14:11:49,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2023-12-02 14:11:49,726 INFO L87 Difference]: Start difference. First operand 1398 states and 1778 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) [2023-12-02 14:11:51,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:51,546 INFO L93 Difference]: Finished difference Result 4227 states and 7026 transitions. [2023-12-02 14:11:51,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-12-02 14:11:51,546 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 [2023-12-02 14:11:51,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:51,589 INFO L225 Difference]: With dead ends: 4227 [2023-12-02 14:11:51,589 INFO L226 Difference]: Without dead ends: 4197 [2023-12-02 14:11:51,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:11:51,596 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 221 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:51,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 284 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:11:51,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4197 states. [2023-12-02 14:11:51,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4197 to 3144. [2023-12-02 14:11:51,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 2065 states have (on average 1.0576271186440678) internal successors, (2184), 2071 states have internal predecessors, (2184), 632 states have call successors, (632), 82 states have call predecessors, (632), 442 states have return successors, (2651), 990 states have call predecessors, (2651), 626 states have call successors, (2651) [2023-12-02 14:11:51,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 5467 transitions. [2023-12-02 14:11:51,974 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 5467 transitions. Word has length 52 [2023-12-02 14:11:51,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:51,975 INFO L495 AbstractCegarLoop]: Abstraction has 3144 states and 5467 transitions. [2023-12-02 14:11:51,975 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) [2023-12-02 14:11:51,975 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 5467 transitions. [2023-12-02 14:11:51,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 14:11:51,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:51,977 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 14:11:51,983 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:11:52,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:52,178 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:52,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:52,178 INFO L85 PathProgramCache]: Analyzing trace with hash -352778574, now seen corresponding path program 1 times [2023-12-02 14:11:52,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:52,178 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943076868] [2023-12-02 14:11:52,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:52,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:52,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:52,333 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:11:52,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:52,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943076868] [2023-12-02 14:11:52,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943076868] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:52,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634413246] [2023-12-02 14:11:52,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:52,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:52,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:52,334 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:52,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 14:11:52,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:52,386 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:11:52,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:52,459 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:11:52,460 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:52,618 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:11:52,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634413246] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:52,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [492660593] [2023-12-02 14:11:52,620 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 14:11:52,620 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:52,621 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) [2023-12-02 14:11:52,622 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:52,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-12-02 14:11:52,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816344632] [2023-12-02 14:11:52,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:52,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 14:11:52,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:52,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 14:11:52,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-12-02 14:11:52,624 INFO L87 Difference]: Start difference. First operand 3144 states and 5467 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) [2023-12-02 14:11:53,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:53,714 INFO L93 Difference]: Finished difference Result 8088 states and 14059 transitions. [2023-12-02 14:11:53,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 14:11:53,714 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 [2023-12-02 14:11:53,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:53,762 INFO L225 Difference]: With dead ends: 8088 [2023-12-02 14:11:53,762 INFO L226 Difference]: Without dead ends: 8086 [2023-12-02 14:11:53,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 14:11:53,768 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 801 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 806 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:53,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [806 Valid, 300 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:11:53,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8086 states. [2023-12-02 14:11:54,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8086 to 8058. [2023-12-02 14:11:54,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8058 states, 5293 states have (on average 1.056489703381825) internal successors, (5592), 5299 states have internal predecessors, (5592), 1616 states have call successors, (1616), 208 states have call predecessors, (1616), 1144 states have return successors, (6821), 2550 states have call predecessors, (6821), 1610 states have call successors, (6821) [2023-12-02 14:11:54,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8058 states to 8058 states and 14029 transitions. [2023-12-02 14:11:54,679 INFO L78 Accepts]: Start accepts. Automaton has 8058 states and 14029 transitions. Word has length 56 [2023-12-02 14:11:54,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:54,680 INFO L495 AbstractCegarLoop]: Abstraction has 8058 states and 14029 transitions. [2023-12-02 14:11:54,680 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) [2023-12-02 14:11:54,680 INFO L276 IsEmpty]: Start isEmpty. Operand 8058 states and 14029 transitions. [2023-12-02 14:11:54,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 14:11:54,682 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:54,682 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] [2023-12-02 14:11:54,687 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 14:11:54,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:54,883 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:54,883 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:54,883 INFO L85 PathProgramCache]: Analyzing trace with hash -2005451109, now seen corresponding path program 1 times [2023-12-02 14:11:54,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:54,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597121041] [2023-12-02 14:11:54,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:54,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:54,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:55,091 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 51 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-12-02 14:11:55,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:55,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597121041] [2023-12-02 14:11:55,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597121041] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:55,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847490777] [2023-12-02 14:11:55,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:55,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:55,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:55,093 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:55,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 14:11:55,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:55,160 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 14:11:55,163 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:55,203 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 43 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 14:11:55,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:55,945 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 60 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-12-02 14:11:55,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847490777] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:55,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [992353629] [2023-12-02 14:11:55,947 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:11:55,947 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:55,947 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) [2023-12-02 14:11:55,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:55,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2023-12-02 14:11:55,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001797925] [2023-12-02 14:11:55,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:55,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 14:11:55,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:55,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 14:11:55,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2023-12-02 14:11:55,949 INFO L87 Difference]: Start difference. First operand 8058 states and 14029 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) [2023-12-02 14:11:57,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:57,923 INFO L93 Difference]: Finished difference Result 16972 states and 33384 transitions. [2023-12-02 14:11:57,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 14:11:57,924 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 [2023-12-02 14:11:57,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:57,981 INFO L225 Difference]: With dead ends: 16972 [2023-12-02 14:11:57,981 INFO L226 Difference]: Without dead ends: 9352 [2023-12-02 14:11:58,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 14:11:58,032 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 138 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:58,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 327 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:11:58,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9352 states. [2023-12-02 14:11:58,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9352 to 9091. [2023-12-02 14:11:58,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9091 states, 5952 states have (on average 1.0460349462365592) internal successors, (6226), 5957 states have internal predecessors, (6226), 1849 states have call successors, (1849), 235 states have call predecessors, (1849), 1286 states have return successors, (5776), 2898 states have call predecessors, (5776), 1843 states have call successors, (5776) [2023-12-02 14:11:58,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9091 states to 9091 states and 13851 transitions. [2023-12-02 14:11:58,950 INFO L78 Accepts]: Start accepts. Automaton has 9091 states and 13851 transitions. Word has length 71 [2023-12-02 14:11:58,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:58,950 INFO L495 AbstractCegarLoop]: Abstraction has 9091 states and 13851 transitions. [2023-12-02 14:11:58,950 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) [2023-12-02 14:11:58,950 INFO L276 IsEmpty]: Start isEmpty. Operand 9091 states and 13851 transitions. [2023-12-02 14:11:58,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 14:11:58,953 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:58,953 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:58,958 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 14:11:59,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 14:11:59,154 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:11:59,154 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:59,154 INFO L85 PathProgramCache]: Analyzing trace with hash -924055203, now seen corresponding path program 2 times [2023-12-02 14:11:59,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:59,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35808273] [2023-12-02 14:11:59,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:59,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:59,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:59,396 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 91 proven. 35 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:11:59,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:59,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35808273] [2023-12-02 14:11:59,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35808273] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:59,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896611089] [2023-12-02 14:11:59,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:59,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:59,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:59,398 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:59,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 14:11:59,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 14:11:59,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:59,476 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 14:11:59,478 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:59,532 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 83 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:11:59,532 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:00,403 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 103 proven. 23 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:12:00,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896611089] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:00,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449035609] [2023-12-02 14:12:00,405 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:12:00,405 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:00,405 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) [2023-12-02 14:12:00,405 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:00,406 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2023-12-02 14:12:00,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989773896] [2023-12-02 14:12:00,406 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:00,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 14:12:00,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:00,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 14:12:00,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:12:00,408 INFO L87 Difference]: Start difference. First operand 9091 states and 13851 transitions. Second operand has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:12:02,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:02,971 INFO L93 Difference]: Finished difference Result 18949 states and 30215 transitions. [2023-12-02 14:12:02,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-12-02 14:12:02,971 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 79 [2023-12-02 14:12:02,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:03,012 INFO L225 Difference]: With dead ends: 18949 [2023-12-02 14:12:03,012 INFO L226 Difference]: Without dead ends: 10296 [2023-12-02 14:12:03,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2001 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 14:12:03,057 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 297 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:03,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 320 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:12:03,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10296 states. [2023-12-02 14:12:03,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10296 to 8519. [2023-12-02 14:12:03,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8519 states, 5708 states have (on average 1.05395935529082) internal successors, (6016), 5732 states have internal predecessors, (6016), 1682 states have call successors, (1682), 279 states have call predecessors, (1682), 1125 states have return successors, (3512), 2507 states have call predecessors, (3512), 1677 states have call successors, (3512) [2023-12-02 14:12:03,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8519 states to 8519 states and 11210 transitions. [2023-12-02 14:12:03,955 INFO L78 Accepts]: Start accepts. Automaton has 8519 states and 11210 transitions. Word has length 79 [2023-12-02 14:12:03,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:03,956 INFO L495 AbstractCegarLoop]: Abstraction has 8519 states and 11210 transitions. [2023-12-02 14:12:03,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:12:03,956 INFO L276 IsEmpty]: Start isEmpty. Operand 8519 states and 11210 transitions. [2023-12-02 14:12:03,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 14:12:03,959 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:03,959 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 14:12:03,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 14:12:04,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 14:12:04,160 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:12:04,160 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:04,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1430800830, now seen corresponding path program 2 times [2023-12-02 14:12:04,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:04,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023409702] [2023-12-02 14:12:04,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:04,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:04,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:04,261 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 96 proven. 31 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-12-02 14:12:04,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:04,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023409702] [2023-12-02 14:12:04,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023409702] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:04,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854265386] [2023-12-02 14:12:04,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:12:04,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:04,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:04,263 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:04,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 14:12:04,349 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 14:12:04,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:04,350 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 14:12:04,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:04,547 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 33 proven. 51 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2023-12-02 14:12:04,548 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:06,063 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 41 proven. 58 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2023-12-02 14:12:06,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854265386] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:06,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772632000] [2023-12-02 14:12:06,065 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:12:06,065 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:06,065 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) [2023-12-02 14:12:06,065 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:06,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2023-12-02 14:12:06,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838159531] [2023-12-02 14:12:06,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:06,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 14:12:06,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:06,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 14:12:06,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 14:12:06,068 INFO L87 Difference]: Start difference. First operand 8519 states and 11210 transitions. Second operand has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2023-12-02 14:12:11,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:11,317 INFO L93 Difference]: Finished difference Result 33531 states and 49208 transitions. [2023-12-02 14:12:11,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-12-02 14:12:11,317 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) Word has length 88 [2023-12-02 14:12:11,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:11,404 INFO L225 Difference]: With dead ends: 33531 [2023-12-02 14:12:11,404 INFO L226 Difference]: Without dead ends: 24831 [2023-12-02 14:12:11,448 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6522 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3275, Invalid=18187, Unknown=0, NotChecked=0, Total=21462 [2023-12-02 14:12:11,449 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 341 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 314 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 1179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 314 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:11,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 318 Invalid, 1179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [314 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:12:11,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24831 states. [2023-12-02 14:12:13,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24831 to 16863. [2023-12-02 14:12:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16863 states, 10869 states have (on average 1.0326616984083172) internal successors, (11224), 10811 states have internal predecessors, (11224), 3413 states have call successors, (3413), 363 states have call predecessors, (3413), 2577 states have return successors, (10028), 5688 states have call predecessors, (10028), 3380 states have call successors, (10028) [2023-12-02 14:12:13,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16863 states to 16863 states and 24665 transitions. [2023-12-02 14:12:13,269 INFO L78 Accepts]: Start accepts. Automaton has 16863 states and 24665 transitions. Word has length 88 [2023-12-02 14:12:13,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:13,269 INFO L495 AbstractCegarLoop]: Abstraction has 16863 states and 24665 transitions. [2023-12-02 14:12:13,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2023-12-02 14:12:13,269 INFO L276 IsEmpty]: Start isEmpty. Operand 16863 states and 24665 transitions. [2023-12-02 14:12:13,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-12-02 14:12:13,273 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:13,273 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2023-12-02 14:12:13,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 14:12:13,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 14:12:13,474 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:12:13,474 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:13,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1406382970, now seen corresponding path program 3 times [2023-12-02 14:12:13,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:13,474 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076281735] [2023-12-02 14:12:13,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:13,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:13,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:13,868 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:12:13,868 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:13,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076281735] [2023-12-02 14:12:13,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076281735] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:13,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021693439] [2023-12-02 14:12:13,869 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:12:13,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:13,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:13,870 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:13,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 14:12:13,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:12:13,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:13,959 INFO L262 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:12:13,961 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:14,059 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:12:14,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:14,566 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:12:14,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021693439] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:14,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756228686] [2023-12-02 14:12:14,567 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:12:14,567 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:14,568 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) [2023-12-02 14:12:14,568 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:14,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2023-12-02 14:12:14,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632374373] [2023-12-02 14:12:14,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:14,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 14:12:14,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:14,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 14:12:14,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 14:12:14,571 INFO L87 Difference]: Start difference. First operand 16863 states and 24665 transitions. Second operand has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:12:18,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:18,024 INFO L93 Difference]: Finished difference Result 25869 states and 37061 transitions. [2023-12-02 14:12:18,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 14:12:18,024 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2023-12-02 14:12:18,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:18,120 INFO L225 Difference]: With dead ends: 25869 [2023-12-02 14:12:18,120 INFO L226 Difference]: Without dead ends: 25868 [2023-12-02 14:12:18,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:12:18,131 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 942 mSDsluCounter, 605 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 283 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 946 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 283 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:18,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [946 Valid, 626 Invalid, 881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [283 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:12:18,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25868 states. [2023-12-02 14:12:20,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25868 to 25023. [2023-12-02 14:12:20,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25023 states, 16149 states have (on average 1.029413585980556) internal successors, (16624), 15971 states have internal predecessors, (16624), 4973 states have call successors, (4973), 483 states have call predecessors, (4973), 3897 states have return successors, (14588), 8568 states have call predecessors, (14588), 4940 states have call successors, (14588) [2023-12-02 14:12:20,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25023 states to 25023 states and 36185 transitions. [2023-12-02 14:12:20,609 INFO L78 Accepts]: Start accepts. Automaton has 25023 states and 36185 transitions. Word has length 90 [2023-12-02 14:12:20,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:20,609 INFO L495 AbstractCegarLoop]: Abstraction has 25023 states and 36185 transitions. [2023-12-02 14:12:20,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:12:20,609 INFO L276 IsEmpty]: Start isEmpty. Operand 25023 states and 36185 transitions. [2023-12-02 14:12:20,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 14:12:20,613 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:20,613 INFO L195 NwaCegarLoop]: trace histogram [14, 10, 9, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 14:12:20,618 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 14:12:20,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:20,814 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:12:20,814 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:20,814 INFO L85 PathProgramCache]: Analyzing trace with hash 359589539, now seen corresponding path program 3 times [2023-12-02 14:12:20,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:20,814 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774963573] [2023-12-02 14:12:20,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:20,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:20,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:20,999 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 202 proven. 52 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2023-12-02 14:12:20,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:20,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774963573] [2023-12-02 14:12:21,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774963573] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:21,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093624842] [2023-12-02 14:12:21,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:12:21,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:21,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:21,001 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:21,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 14:12:21,084 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:12:21,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:21,086 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:12:21,087 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:21,148 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 219 proven. 26 refuted. 0 times theorem prover too weak. 185 trivial. 0 not checked. [2023-12-02 14:12:21,148 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:22,010 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 183 proven. 59 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2023-12-02 14:12:22,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093624842] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:22,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967184394] [2023-12-02 14:12:22,011 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:12:22,011 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:22,012 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) [2023-12-02 14:12:22,012 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:22,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 15 [2023-12-02 14:12:22,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481526783] [2023-12-02 14:12:22,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:22,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 14:12:22,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:22,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 14:12:22,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:12:22,014 INFO L87 Difference]: Start difference. First operand 25023 states and 36185 transitions. Second operand has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2023-12-02 14:12:25,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:25,480 INFO L93 Difference]: Finished difference Result 56157 states and 115234 transitions. [2023-12-02 14:12:25,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:12:25,481 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) Word has length 124 [2023-12-02 14:12:25,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:25,654 INFO L225 Difference]: With dead ends: 56157 [2023-12-02 14:12:25,654 INFO L226 Difference]: Without dead ends: 32814 [2023-12-02 14:12:25,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 249 SyntacticMatches, 6 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=326, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:12:25,785 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 129 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:25,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 161 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:12:25,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32814 states. [2023-12-02 14:12:28,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32814 to 28421. [2023-12-02 14:12:28,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28421 states, 18912 states have (on average 1.0412965313028766) internal successors, (19693), 18910 states have internal predecessors, (19693), 5531 states have call successors, (5531), 795 states have call predecessors, (5531), 3974 states have return successors, (17686), 8715 states have call predecessors, (17686), 5478 states have call successors, (17686) [2023-12-02 14:12:29,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28421 states to 28421 states and 42910 transitions. [2023-12-02 14:12:29,070 INFO L78 Accepts]: Start accepts. Automaton has 28421 states and 42910 transitions. Word has length 124 [2023-12-02 14:12:29,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:29,070 INFO L495 AbstractCegarLoop]: Abstraction has 28421 states and 42910 transitions. [2023-12-02 14:12:29,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2023-12-02 14:12:29,071 INFO L276 IsEmpty]: Start isEmpty. Operand 28421 states and 42910 transitions. [2023-12-02 14:12:29,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 14:12:29,075 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:29,075 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 10, 10, 10, 9, 9, 9, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:12:29,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 14:12:29,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:29,276 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:12:29,276 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:29,276 INFO L85 PathProgramCache]: Analyzing trace with hash 506365855, now seen corresponding path program 3 times [2023-12-02 14:12:29,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:29,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778368485] [2023-12-02 14:12:29,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:29,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:29,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:29,669 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 243 proven. 179 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-12-02 14:12:29,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:29,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778368485] [2023-12-02 14:12:29,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778368485] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:29,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009245908] [2023-12-02 14:12:29,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:12:29,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:29,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:29,671 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:29,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 14:12:29,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:12:29,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:29,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 14:12:29,777 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:29,855 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 235 proven. 182 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 14:12:29,855 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:31,045 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 255 proven. 167 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-12-02 14:12:31,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009245908] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:31,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110741987] [2023-12-02 14:12:31,048 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:12:31,048 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:31,048 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) [2023-12-02 14:12:31,048 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:31,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2023-12-02 14:12:31,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874797445] [2023-12-02 14:12:31,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:31,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-12-02 14:12:31,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:31,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-12-02 14:12:31,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 14:12:31,051 INFO L87 Difference]: Start difference. First operand 28421 states and 42910 transitions. Second operand has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:12:35,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:35,167 INFO L93 Difference]: Finished difference Result 29622 states and 44574 transitions. [2023-12-02 14:12:35,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 14:12:35,168 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 119 [2023-12-02 14:12:35,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:35,257 INFO L225 Difference]: With dead ends: 29622 [2023-12-02 14:12:35,257 INFO L226 Difference]: Without dead ends: 29621 [2023-12-02 14:12:35,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1858, Invalid=6514, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 14:12:35,269 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 298 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 832 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 298 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:35,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [298 Valid, 357 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 832 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:12:35,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29621 states. [2023-12-02 14:12:37,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29621 to 28421. [2023-12-02 14:12:38,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28421 states, 18912 states have (on average 1.038917089678511) internal successors, (19648), 18910 states have internal predecessors, (19648), 5531 states have call successors, (5531), 795 states have call predecessors, (5531), 3974 states have return successors, (17686), 8715 states have call predecessors, (17686), 5478 states have call successors, (17686) [2023-12-02 14:12:38,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28421 states to 28421 states and 42865 transitions. [2023-12-02 14:12:38,136 INFO L78 Accepts]: Start accepts. Automaton has 28421 states and 42865 transitions. Word has length 119 [2023-12-02 14:12:38,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:38,137 INFO L495 AbstractCegarLoop]: Abstraction has 28421 states and 42865 transitions. [2023-12-02 14:12:38,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:12:38,137 INFO L276 IsEmpty]: Start isEmpty. Operand 28421 states and 42865 transitions. [2023-12-02 14:12:38,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 14:12:38,146 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:38,146 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:12:38,152 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 14:12:38,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 14:12:38,346 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:12:38,347 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:38,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1211092801, now seen corresponding path program 4 times [2023-12-02 14:12:38,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:38,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075999561] [2023-12-02 14:12:38,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:38,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:38,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:38,849 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 74 proven. 173 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2023-12-02 14:12:38,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:38,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075999561] [2023-12-02 14:12:38,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075999561] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:38,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260793397] [2023-12-02 14:12:38,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:12:38,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:38,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:38,851 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:38,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 14:12:38,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:38,983 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 14:12:38,985 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 62 proven. 160 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2023-12-02 14:12:39,075 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:43,735 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 74 proven. 223 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2023-12-02 14:12:43,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260793397] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:43,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1016938214] [2023-12-02 14:12:43,736 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:12:43,736 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:43,737 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) [2023-12-02 14:12:43,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:43,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2023-12-02 14:12:43,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191822917] [2023-12-02 14:12:43,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:43,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 14:12:43,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:43,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 14:12:43,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 14:12:43,740 INFO L87 Difference]: Start difference. First operand 28421 states and 42865 transitions. Second operand has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2023-12-02 14:13:06,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:06,479 INFO L93 Difference]: Finished difference Result 194513 states and 386435 transitions. [2023-12-02 14:13:06,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2023-12-02 14:13:06,480 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) Word has length 128 [2023-12-02 14:13:06,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:07,713 INFO L225 Difference]: With dead ends: 194513 [2023-12-02 14:13:07,713 INFO L226 Difference]: Without dead ends: 191961 [2023-12-02 14:13:07,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70773 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=25690, Invalid=135512, Unknown=0, NotChecked=0, Total=161202 [2023-12-02 14:13:07,923 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 557 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 1304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 557 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 2164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1304 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:07,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [557 Valid, 362 Invalid, 2164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1304 Valid, 860 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 14:13:08,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191961 states. [2023-12-02 14:13:19,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191961 to 50602. [2023-12-02 14:13:19,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50602 states, 32512 states have (on average 1.0257135826771653) internal successors, (33348), 32510 states have internal predecessors, (33348), 10221 states have call successors, (10221), 993 states have call predecessors, (10221), 7865 states have return successors, (44541), 17098 states have call predecessors, (44541), 10149 states have call successors, (44541) [2023-12-02 14:13:20,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50602 states to 50602 states and 88110 transitions. [2023-12-02 14:13:20,049 INFO L78 Accepts]: Start accepts. Automaton has 50602 states and 88110 transitions. Word has length 128 [2023-12-02 14:13:20,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:20,049 INFO L495 AbstractCegarLoop]: Abstraction has 50602 states and 88110 transitions. [2023-12-02 14:13:20,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2023-12-02 14:13:20,050 INFO L276 IsEmpty]: Start isEmpty. Operand 50602 states and 88110 transitions. [2023-12-02 14:13:20,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 14:13:20,058 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:20,058 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2023-12-02 14:13:20,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 14:13:20,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 14:13:20,259 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:13:20,259 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:20,259 INFO L85 PathProgramCache]: Analyzing trace with hash 878704996, now seen corresponding path program 2 times [2023-12-02 14:13:20,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:20,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190626915] [2023-12-02 14:13:20,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:20,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:20,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:21,052 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:13:21,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:21,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190626915] [2023-12-02 14:13:21,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190626915] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:21,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578925074] [2023-12-02 14:13:21,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:13:21,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:21,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:21,053 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:21,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 14:13:21,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-12-02 14:13:21,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:13:21,228 INFO L262 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 42 conjunts are in the unsatisfiable core [2023-12-02 14:13:21,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:21,546 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:13:21,546 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:13:22,112 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:13:22,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578925074] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:13:22,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440670559] [2023-12-02 14:13:22,114 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 14:13:22,115 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:13:22,115 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) [2023-12-02 14:13:22,115 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:13:22,116 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2023-12-02 14:13:22,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458675987] [2023-12-02 14:13:22,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:13:22,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 14:13:22,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:22,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 14:13:22,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 14:13:22,118 INFO L87 Difference]: Start difference. First operand 50602 states and 88110 transitions. Second operand has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:13:35,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:35,065 INFO L93 Difference]: Finished difference Result 116323 states and 204104 transitions. [2023-12-02 14:13:35,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 14:13:35,066 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2023-12-02 14:13:35,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:35,669 INFO L225 Difference]: With dead ends: 116323 [2023-12-02 14:13:35,669 INFO L226 Difference]: Without dead ends: 116322 [2023-12-02 14:13:35,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:13:35,712 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 1709 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 641 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1712 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 1202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 641 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:35,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1712 Valid, 554 Invalid, 1202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [641 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:13:35,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116322 states. [2023-12-02 14:13:49,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116322 to 116266. [2023-12-02 14:13:49,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116266 states, 74764 states have (on average 1.0261088224279065) internal successors, (76716), 74810 states have internal predecessors, (76716), 23481 states have call successors, (23481), 2313 states have call predecessors, (23481), 18017 states have return successors, (103881), 39142 states have call predecessors, (103881), 23325 states have call successors, (103881) [2023-12-02 14:13:50,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116266 states to 116266 states and 204078 transitions. [2023-12-02 14:13:50,460 INFO L78 Accepts]: Start accepts. Automaton has 116266 states and 204078 transitions. Word has length 140 [2023-12-02 14:13:50,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:50,461 INFO L495 AbstractCegarLoop]: Abstraction has 116266 states and 204078 transitions. [2023-12-02 14:13:50,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:13:50,461 INFO L276 IsEmpty]: Start isEmpty. Operand 116266 states and 204078 transitions. [2023-12-02 14:13:50,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2023-12-02 14:13:50,488 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:50,489 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2023-12-02 14:13:50,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-12-02 14:13:50,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 14:13:50,689 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:13:50,689 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:50,689 INFO L85 PathProgramCache]: Analyzing trace with hash 343472514, now seen corresponding path program 4 times [2023-12-02 14:13:50,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:50,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796176637] [2023-12-02 14:13:50,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:50,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:50,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:51,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:13:51,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:51,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796176637] [2023-12-02 14:13:51,636 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796176637] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:51,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855193813] [2023-12-02 14:13:51,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:13:51,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:51,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:51,637 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:51,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 14:13:51,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:51,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 14:13:51,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:51,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:13:51,993 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:13:53,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:13:53,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855193813] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:13:53,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382908285] [2023-12-02 14:13:53,723 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:13:53,723 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:13:53,723 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) [2023-12-02 14:13:53,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:13:53,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2023-12-02 14:13:53,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490365709] [2023-12-02 14:13:53,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:13:53,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2023-12-02 14:13:53,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:53,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2023-12-02 14:13:53,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 14:13:53,727 INFO L87 Difference]: Start difference. First operand 116266 states and 204078 transitions. Second operand has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:14:16,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:14:16,596 INFO L93 Difference]: Finished difference Result 184935 states and 321142 transitions. [2023-12-02 14:14:16,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2023-12-02 14:14:16,597 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2023-12-02 14:14:16,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:14:17,739 INFO L225 Difference]: With dead ends: 184935 [2023-12-02 14:14:17,739 INFO L226 Difference]: Without dead ends: 184934 [2023-12-02 14:14:17,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8376 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=10814, Invalid=23968, Unknown=0, NotChecked=0, Total=34782 [2023-12-02 14:14:17,812 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 2393 mSDsluCounter, 1127 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 527 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2397 SdHoareTripleChecker+Valid, 1148 SdHoareTripleChecker+Invalid, 1683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 527 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:14:17,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2397 Valid, 1148 Invalid, 1683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [527 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 14:14:17,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184934 states. [2023-12-02 14:14:38,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184934 to 180970. [2023-12-02 14:14:38,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180970 states, 116428 states have (on average 1.0254234376610438) internal successors, (119388), 116426 states have internal predecessors, (119388), 36009 states have call successors, (36009), 3321 states have call predecessors, (36009), 28529 states have return successors, (159873), 61222 states have call predecessors, (159873), 35853 states have call successors, (159873) [2023-12-02 14:14:39,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180970 states to 180970 states and 315270 transitions. [2023-12-02 14:14:39,935 INFO L78 Accepts]: Start accepts. Automaton has 180970 states and 315270 transitions. Word has length 186 [2023-12-02 14:14:39,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:14:39,935 INFO L495 AbstractCegarLoop]: Abstraction has 180970 states and 315270 transitions. [2023-12-02 14:14:39,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:14:39,936 INFO L276 IsEmpty]: Start isEmpty. Operand 180970 states and 315270 transitions. [2023-12-02 14:14:39,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2023-12-02 14:14:39,980 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:14:39,980 INFO L195 NwaCegarLoop]: trace histogram [31, 22, 21, 18, 18, 18, 18, 17, 17, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 14:14:39,987 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 14:14:40,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 14:14:40,181 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:14:40,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:14:40,181 INFO L85 PathProgramCache]: Analyzing trace with hash 1124228866, now seen corresponding path program 1 times [2023-12-02 14:14:40,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:14:40,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537451530] [2023-12-02 14:14:40,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:14:40,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:14:40,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:14:41,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2525 backedges. 544 proven. 278 refuted. 0 times theorem prover too weak. 1703 trivial. 0 not checked. [2023-12-02 14:14:41,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:14:41,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537451530] [2023-12-02 14:14:41,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537451530] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:14:41,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421152823] [2023-12-02 14:14:41,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:14:41,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:14:41,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:14:41,489 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:14:41,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f9c8c6d-dfd3-40fd-aaa5-3e174513be80/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 14:14:41,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:14:41,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 650 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 14:14:41,671 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:14:42,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2525 backedges. 957 proven. 324 refuted. 0 times theorem prover too weak. 1244 trivial. 0 not checked. [2023-12-02 14:14:42,174 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:14:45,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2525 backedges. 980 proven. 436 refuted. 0 times theorem prover too weak. 1109 trivial. 0 not checked. [2023-12-02 14:14:45,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421152823] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:14:45,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [533204983] [2023-12-02 14:14:45,787 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:14:45,787 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:14:45,788 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) [2023-12-02 14:14:45,788 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:14:45,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2023-12-02 14:14:45,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036863128] [2023-12-02 14:14:45,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:14:45,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 14:14:45,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:14:45,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 14:14:45,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 14:14:45,791 INFO L87 Difference]: Start difference. First operand 180970 states and 315270 transitions. Second operand has 50 states, 50 states have (on average 3.12) internal successors, (156), 38 states have internal predecessors, (156), 23 states have call successors, (26), 3 states have call predecessors, (26), 20 states have return successors, (47), 27 states have call predecessors, (47), 21 states have call successors, (47)